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open-source-search-engine/Mem.cpp

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#include "gb-include.h"
#include "Mem.h"
#include <sys/time.h> // setrlimit()
#include <sys/resource.h> // setrlimit()
#include "Threads.h"
#include "SafeBuf.h"
#include "PingServer.h"
//#include "MemPoolVar.h"
//#include "malloc.h"
//#include "Stats.h"
#include "Pages.h"
// uncomment this #define to electric fence just on umsg00 buffers:
//#define SPECIAL
// put me back
//#define EFENCE
//#define EFENCE_SIZE 50000
// uncomment this for EFENCE to do underflow checks instead of the
// default overflow checks
//#define CHECKUNDERFLOW
// only Mem.cpp can call ::malloc, everyone else must call mmalloc() so
// we can keep tabs on memory usage. in Mem.h we #define this to be coreme()
#undef malloc
#undef calloc
#undef realloc
bool g_inMemFunction = false;
// from malloc.c (dlmalloc)
//void *dlmalloc(size_t);
//void dlfree(void*);
//void* dlcalloc(size_t, size_t);
//void* dlrealloc(void*, size_t);
//#include "malloc.c"
#define sysmalloc ::malloc
#define syscalloc ::calloc
#define sysrealloc ::realloc
#define sysfree ::free
/*
// try using dlmalloc to see how it cores
#define sysmalloc dlmalloc
#define syscalloc dlcalloc
#define sysrealloc dlrealloc
#define sysfree dlfree
*/
// allocate an extra space before and after the allocated memory to try
// to catch sequential buffer underruns and overruns. if the write is way
// beyond this padding radius, chances are it will seg fault right then and
// there because it will hit a different PAGE, to be more sure we could
// make UNDERPAD and OVERPAD PAGE bytes, although the overrun could still write
// to another allocated area of memory and we can never catch it.
#if defined(EFENCE) || defined(EFENCE_SIZE)
#define UNDERPAD 0
#define OVERPAD 0
#else
#define UNDERPAD 4
#define OVERPAD 4
#endif
#define MAGICCHAR 0xda
class Mem g_mem;
extern bool g_isYippy;
bool freeCacheMem();
#if defined(EFENCE) || defined(EFENCE_SIZE) || defined(SPECIAL)
static void *getElecMem ( int32_t size ) ;
static void freeElecMem ( void *p ) ;
#endif
/*
static int32_t s_mutexLockAvail = 1;
// usually we can use the UdpServer ptr as the pid, or if the main process,
// then just use 0
void mutexLock ( ) {
//log("gb: mutex lock");
loop:
//log("gb: mutex lock loop 1");
// wait for the lock if already taken
while ( s_mutexLockAvail != 1 ) sched_yield();
//log("gb: mutex lock loop 2");
// . it now *seems* to be available, i.e. equal to 1 so try to get it
// . similar to atomic.h in kernel source
// Atomically decrements @s_mutexLockAvail by 1
// and returns true if the result is zero, or false for all
// other cases. Note that the guaranteed
// useful range of an atomic_t is only 24 bits.
unsigned char c;
__asm__ __volatile__(
"lock;"
"decl %0; sete %1"
:"=m" (s_mutexLockAvail), "=qm" (c)
:"m" (s_mutexLockAvail)
: "memory");
//log("gb c=%" INT32 " mutexAvail=%" INT32 "",c,s_mutexLockAvail);
// if c is 0, we got the lock, otherwise, keep trying
if ( c != 1 ) {
//log("gb: failed to get lock. retrying.");
goto loop;
}
// log("gb: got mutex lock");
s_mutexLockAvail = 0;
}
void mutexUnlock ( ) {
//if ( s_mutexLockAvail != 0 ) {
// log("gb: mutex unlock HEY lock=%" INT32 "",s_mutexLockAvail);
// //char *xx = NULL; *xx = 0;
//}
// a single instruction is atomic
__asm__ __volatile__(
//"lock;"
"movl $1,%0;"
:"=m" (s_mutexLockAvail)
:"m" (s_mutexLockAvail)
: "memory");
if ( s_mutexLockAvail != 1 )
logf(LOG_INFO,"gb: mutex unlock lock=%" INT32 "",s_mutexLockAvail);
}
*/
// if we alloc too much in one call, pthread_create() fails for some reason
//#define MAXMEMPERCALL (256*1024*1024-1)
//[mwells@lenny c]$ echo "inuse on" > .psrc
//[mwells@lenny c]$ ./slowleak
//** Insure messages will be written to insra **
//[mwells@lenny c]$ tca -X
// the thread lock
//static pthread_mutex_t s_lock = PTHREAD_MUTEX_INITIALIZER;
// make it big for production machines
//#define DMEMTABLESIZE (1024*602)
// there should not be too many mallocs any more
// i boosted from 300k to 600k so we can get summaries for 150k results
// for the csv download...
//#define DMEMTABLESIZE (1024*600)
//#define DMEMTABLESIZE (1024*202)
// and small for local machine
//#define DMEMTABLESIZE (1024*50)
// a table used in debug to find mem leaks
static void **s_mptrs ;
static int32_t *s_sizes ;
static char *s_labels;
static char *s_isnew;
static int32_t s_n = 0;
static bool s_initialized = 0;
// our own memory manager
//static MemPoolVar s_pool;
void operator delete (void *ptr) throw () {
// now just call this
g_mem.gbfree ( (char *)ptr , -1 , NULL );
}
void operator delete [] ( void *ptr ) throw () {
// now just call this
// the 4 bytes are # of objects in the array
g_mem.gbfree ( ((char *)ptr-4) , -1 , NULL );
}
#define MINMEM 6000000
//#define MINMEM 0
// caution -- put {}'s around the "new"
//#define new(X) new X; g_mem.addMem(X,sizeof(*X),"new");
void Mem::addnew ( void *ptr , int32_t size , const char *note ) {
// 1 --> isnew
addMem ( ptr , size , note , 1 );
}
void Mem::delnew ( void *ptr , int32_t size , const char *note ) {
// we don't need to use mdelete() if checking for leaks is enabled
// because the size of the allocated mem is in the hash table under
// s_sizes[]. and the delete() operator is overridden below to
// catch this.
return;
/*
// don't let electric fence zap us
//if ( size == 0 && ptr==(void *)0x7fffffff) return;
if ( size == 0 ) return;
// watch out for bad sizes
if ( size < 0 ) {
log(LOG_LOGIC,"mem: delete(%" INT32 "): Bad size.", size );
return;
}
// debug
if ( size > MINMEM )
log(LOG_INFO,"mem: delete(%" INT32 "): %s.",size,note);
// count it
if ( size > 0 ) {
m_used -= size;
m_numAllocated--;
}
*/
}
// this must be defined for newer libc++
//int bad_alloc ( ) { return 1; };
// . global override of new and delete operators
// . seems like constructor and destructor are still called
// . just use to check if enough memory
// . before this just called mmalloc which sometimes returned NULL which
// would cause us to throw an unhandled signal. So for now I don't
// call mmalloc since it is limited in the mem it can use and would often
// return NULL and set g_errno to ENOMEM
void * operator new (size_t size) {
// don't let electric fence zap us
if ( size == 0 ) return (void *)0x7fffffff;
// . fail randomly
// . good for testing if we can handle out of memory gracefully
//static int32_t s_mcount = 0;
//s_mcount++;
//if ( s_mcount > 57 && (rand() % 1000) < 2 ) {
if ( g_conf.m_testMem && (rand() % 100) < 2 ) {
g_errno = ENOMEM;
log("mem: new-fake(%" UINT32 "): %s",(uint32_t)size,
mstrerror(g_errno));
throw std::bad_alloc();
// return NULL; }
}
//char unlock = true;
//if ( ! g_stats.m_gotLock || g_threads.amThread() ) mutexLock();
//else unlock = false;
// hack so hostid #0 can use more mem
int64_t max = g_conf.m_maxMem;
//if ( g_hostdb.m_hostId == 0 ) max += 2000000000;
// don't go over max
if ( g_mem.m_used + (int32_t)size >= max &&
g_conf.m_maxMem > 1000000 ) {
log("mem: new(%" UINT32 "): Out of memory.", (uint32_t)size );
//if ( unlock ) mutexUnlock();
throw std::bad_alloc();
//throw 1;
}
g_inMemFunction = true;
#ifdef EFENCE
void *mem = getElecMem(size);
#elif EFENCE_SIZE
void *mem;
if ( size > EFENCE_SIZE )
mem = getElecMem(size);
else
mem = sysmalloc ( size );
#else
//void *mem = dlmalloc ( size );
void *mem = sysmalloc ( size );
#endif
g_inMemFunction = false;
int32_t memLoop = 0;
newmemloop:
//void *mem = s_pool.malloc ( size );
if ( ! mem && size > 0 ) {
g_mem.m_outOfMems++;
g_errno = errno;
log("mem: new(%" INT32 "): %s",(int32_t)size,mstrerror(g_errno));
//if ( unlock ) mutexUnlock();
throw std::bad_alloc();
//throw 1;
//return NULL;
}
if ( (PTRTYPE)mem < 0x00010000 ) {
#ifdef EFENCE
void *remem = getElecMem(size);
#else
void *remem = sysmalloc(size);
#endif
log ( LOG_WARN, "mem: Caught low memory allocation "
"at %08" PTRFMT ", "
"reallocated to %08" PTRFMT ,
(PTRTYPE)mem,
(PTRTYPE)remem );
#ifdef EFENCE
freeElecMem (mem);
#else
sysfree(mem);
#endif
mem = remem;
if ( memLoop > 100 ) {
log ( LOG_WARN, "mem: Attempted to reallocate low "
"memory allocation 100 times, "
"aborting and returning ENOMEM." );
g_errno = ENOMEM;
//if ( unlock ) mutexUnlock();
throw std::bad_alloc();
}
goto newmemloop;
}
g_mem.addMem ( mem , size , "TMPMEM" , 1 );
//if ( unlock ) mutexUnlock();
return mem;
}
//WARNING: Use this construct only when your datatype has a destructor!
//the compiler checks to see if a destructor is defined, if it is it
//will add 4 bytes to your requested size and put the number of objects
//in those bytes and returns a mem ptr at the malloced address + 4.
//this can screw up the subsequent call to addmem because the size and
//ptrs are off.
void * operator new [] (size_t size) {
// don't let electric fence zap us
if ( size == 0 ) return (void *)0x7fffffff;
// . fail randomly
// . good for testing if we can handle out of memory gracefully
//static int32_t s_count = 0;
//s_count++;
//if ( s_count > 3000 && (rand() % 100) < 2 ) {
// g_errno = ENOMEM;
// log("mem: new-fake(%i): %s",size, mstrerror(g_errno));
// throw bad_alloc();
// // return NULL; }
//}
// hack so hostid #0 can use more mem
int64_t max = g_conf.m_maxMem;
//if ( g_hostdb.m_hostId == 0 ) max += 2000000000;
// don't go over max
if ( g_mem.m_used + (int32_t)size >= max &&
g_conf.m_maxMem > 1000000 ) {
log("mem: new(%" UINT32 "): Out of memory.", (uint32_t)size );
throw std::bad_alloc();
//throw 1;
}
g_inMemFunction = true;
#ifdef EFENCE
void *mem = getElecMem(size);
#elif EFENCE_SIZE
void *mem;
if ( size > EFENCE_SIZE )
mem = getElecMem(size);
else
mem = sysmalloc ( size );
#else
//void *mem = dlmalloc ( size );
void *mem = sysmalloc ( size );
#endif
g_inMemFunction = false;
int32_t memLoop = 0;
newmemloop:
//void *mem = s_pool.malloc ( size );
if ( ! mem && size > 0 ) {
g_errno = errno;
g_mem.m_outOfMems++;
log("mem: new(%" UINT32 "): %s",
(uint32_t)size, mstrerror(g_errno));
//if ( unlock ) mutexUnlock();
throw std::bad_alloc();
//throw 1;
//return NULL;
}
if ( (PTRTYPE)mem < 0x00010000 ) {
#ifdef EFENCE
void *remem = getElecMem(size);
#else
void *remem = sysmalloc(size);
#endif
log ( LOG_WARN, "mem: Caught low memory allocation at "
"%08" PTRFMT ", "
"reallocated to %08" PTRFMT "",
(PTRTYPE)mem, (PTRTYPE)remem );
#ifdef EFENCE
freeElecMem (mem);
#else
sysfree(mem);
#endif
mem = remem;
if ( memLoop > 100 ) {
log ( LOG_WARN, "mem: Attempted to reallocate low "
"memory allocation 100 times, "
"aborting and returning ENOMEM." );
g_errno = ENOMEM;
//if ( unlock ) mutexUnlock();
throw std::bad_alloc();
}
goto newmemloop;
}
//offset by 4 because that is metadata describing the number of objs
//in the array
g_mem.addMem ( (char*)mem+4 , size-4, "TMPMEM" , 1 );
//if ( unlock ) mutexUnlock();
return mem;
}
Mem::Mem() {
m_used = 0;
// assume large max until this gets set for real
//m_maxMem = 50000000;
m_numAllocated = 0;
m_numTotalAllocated = 0;
m_maxAlloc = 0;
m_maxAllocBy = "";
m_maxAlloced = 0;
m_memtablesize = 0;//DMEMTABLESIZE;
m_stackStart = NULL;
// shared mem used
m_sharedUsed = 0LL;
// count how many allocs/news failed
m_outOfMems = 0;
}
Mem::~Mem() {
if ( getUsedMem() == 0 ) return;
//log(LOG_INIT,"mem: Memory allocated now: %" INT32 ".\n", getUsedMem() );
// this is now called from main.cpp::allExit() because it freezes
// up in printMem()'s call to sysmalloc() for some reason
// printMem();
}
//int32_t Mem::getUsedMem () { return 0; }; //return mallinfo().usmblks; };
int64_t Mem::getAvailMem () { return 0; };
//int64_t Mem::getMaxAlloced () { return 0; };
int64_t Mem::getMaxMem () { return g_conf.m_maxMem; }
int32_t Mem::getNumChunks () { return 0; };
// process id of the main process
pid_t s_pid = (pid_t) -1;
void Mem::setPid() {
s_pid = getpid();
//log("mem: pid is %" INT32 "",(int32_t)s_pid);
if(s_pid == -1 ) { log("monitor: bad s_pid"); char *xx=NULL;*xx=0; }
}
pid_t Mem::getPid() {
return s_pid;
}
bool Mem::init ( ) { // int64_t maxMem ) {
// set main process pid
s_pid = getpid();
// . don't swap our memory out, man...
// . damn, linux 2.4.17 seems to crash the kernel sometimes w/ this
//if ( mlockall( MCL_CURRENT | MCL_FUTURE ) == -1 ) {
// log("Mem::init: mlockall: %s" , strerror(errno) );
// errno = 0;
//}
//m_maxMem = maxMem;
// set it
//struct rlimit lim;
//lim.rlim_max = maxMem;
//setrlimit ( RLIMIT_AS , &lim ); // ulimit -v
// note
//log(LOG_INIT,"mem: Max memory usage set to %" INT64 " bytes.", maxMem);
// warning msg
if ( g_conf.m_detectMemLeaks )
log(LOG_INIT,"mem: Memory leak checking is enabled.");
#if defined(EFENCE) || defined(EFENCE_SIZE)
log(LOG_INIT,"mem: using electric fence!!!!!!!");
#endif
/*
take this out for now it seems to hang the OS when running
as root
#ifndef TITAN
// if we can't alloc 3gb exit and retry
int64_t start = gettimeofdayInMilliseconds();
char *pools[30];
int64_t count = 0LL;
int64_t chunk = 100000000LL; // 100MB chunks
int64_t need = 3000000000LL; // 3GB
int32_t i = 0; for ( i = 0 ; i < 30 ; i++ ) {
pools[i] = (char *)mmalloc(chunk,"testmem");
count += chunk;
if ( pools[i] ) continue;
count -= chunk;
log("mem: could only alloc %" INT64 " bytes of the "
"%" INT64 " required to run gigablast. exiting.",
count , need );
}
for ( int32_t j = 0 ; j < i ; j++ )
mfree ( pools[j] , chunk , "testmem" );
int64_t now = gettimeofdayInMilliseconds();
int64_t took = now - start;
if ( took > 20 ) log("mem: took %" INT64 " ms to check memory ceiling",took);
// return if could not alloc the full 3GB
if ( i < 30 ) return false;
#endif
*/
// reset this, our max mem used over time ever because we don't
// want the mem test we did above to count towards it
m_maxAlloced = 0;
// init or own malloc stuff in malloc.c (from doug leay)
//if ( mdw_init_sbrk ( maxMem ) ) return true;
// bitch
//return log("Mem::init: failed to malloc %" INT32 " bytes", maxMem);
return true;
}
//bool Mem::reserveMem ( int64_t bytesToReserve ) {
// TODO: use sbrk()?
// char *s = (char *) malloc ( bytesToReserve );
// if ( s ) { free ( s ); return true; }
// TODO: try smaller blocks
// return false;
//}
// this is called by C++ classes' constructors to register mem
void Mem::addMem ( void *mem , int32_t size , const char *note , char isnew ) {
// enforce safebuf::setLabel being called
//if ( size>=100000 && note && strcmp(note,"SafeBuf")==0 ) {
// char *xx=NULL;*xx=0; }
//validate();
// if ( note && note[0] == 'S' && note[1] == 'a' &&
// note[2] == 'f' && size == 1179 )
// log("mem: got mystery safebuf");
//m_memtablesize = 0;//DMEMTABLESIZE;
// 4G/x = 600*1024 -> x = 4000000000.0/(600*1024) = 6510
// crap, g_hostdb.init() is called inmain.cpp before
// g_conf.init() which is needed to set g_conf.m_maxMem...
if ( ! s_initialized ) {
//m_memtablesize = m_maxMem / 6510;
// support 1.2M ptrs for now. good for about 8GB
// raise from 3000 to 8194 to fix host #1
m_memtablesize = 8194*1024;//m_maxMem / 6510;
//if ( m_maxMem < 8000000000 ) { char *xx=NULL;*xx=0; }
}
if ( (int32_t)m_numAllocated + 100 >= (int32_t)m_memtablesize ) {
bool s_printed = false;
if ( ! s_printed ) {
log("mem: using too many slots");
printMem();
s_printed = true;
}
}
// sanity check
if ( g_inSigHandler ) {
log(LOG_LOGIC,"mem: In sig handler.");
char *xx = NULL; *xx = 0;
}
// debug msg (mdw)
//char bb[100];
//bb[0]=0;
//if ( strcmp(note,"UdpSlot")== 0 ) {
// unsigned char c = (*(unsigned char *)mem) & 0x3f;
// sprintf(bb," msgType=0x%"XINT32"",(int32_t)c);
//}
if ( g_conf.m_logDebugMem )
log("mem: add %08" PTRFMT " %" INT32 " bytes (%" INT64 ") (%s)",
(PTRTYPE)mem,size,m_used,note);
//if ( strcmp(note,"RdbList") == 0 )
// log("mem: freelist%08"XINT32" %" INT32 "bytes (%s)",(int32_t)mem,size,note);
// check for breech after every call to alloc or free in order to
// more easily isolate breeching code.. this slows things down a lot
// though.
if ( g_conf.m_logDebugMem ) printBreeches(1);
// copy the magic character, iff not a new() call
if ( size == 0 ) { char *xx = NULL; *xx = 0; }
// don't add 0 bytes
//if ( size == 0 ) return;
// sanity check
if ( size < 0 ) {
log("mem: addMem: Negative size.");
return;
}
// sanity check -- for machines with > 4GB ram?
if ( (PTRTYPE)mem + (PTRTYPE)size < (PTRTYPE)mem ) {
log(LOG_LOGIC,"mem: Kernel returned mem at "
"%08" PTRFMT " of size %" INT32 " "
"which would wrap. Bad kernel.",
(PTRTYPE)mem,(int32_t)size);
char *xx = NULL;
*xx = 0;
}
// umsg00
bool useElectricFence = false;
#ifdef SPECIAL
if ( note[0] == 'u' &&
note[1] == 'm' &&
note[2] == 's' &&
note[3] == 'g' &&
note[4] == '0' &&
note[5] == '0' )
useElectricFence = true;
#endif
if ( ! isnew && ! useElectricFence ) {
for ( int32_t i = 0 ; i < UNDERPAD ; i++ )
((char *)mem)[0-i-1] = MAGICCHAR;
for ( int32_t i = 0 ; i < OVERPAD ; i++ )
((char *)mem)[0+size+i] = MAGICCHAR;
}
// hey!
if ( s_pid == -1 && m_numTotalAllocated >1000 ) {
log(LOG_WARN, "pid is %i and numAllocs is %i", (int)s_pid,
(int)m_numTotalAllocated);
//char *xx=NULL;*xx=0;}
// if ( s_pid == -1 && m_numTotalAllocated >1000 ) { char *xx=NULL;*xx=0;}
}
// threads can't be here!
if ( s_pid != -1 && getpid() != s_pid ) {
log("mem: addMem: Called from thread.");
sleep(50000);
//char *p = NULL;
//*p = 1;
char *xx = NULL; *xx = 0;
}
// if no label!
if ( ! note[0] ) log(LOG_LOGIC,"mem: addmem: NO note.");
// lock for threads
//pthread_mutex_lock ( &s_lock );
// return NULL if we'd go over our limit
//if ( getUsedMem() + size > s_maxMem ) {
// log("Mem::addMem: max mem limit breeched");
// sleep(50000);
// return;
//}
// clear mem ptrs if this is our first call
if ( ! s_initialized ) {
s_mptrs = (void **)sysmalloc ( m_memtablesize*sizeof(void *));
s_sizes = (int32_t *)sysmalloc ( m_memtablesize*sizeof(int32_t ));
s_labels = (char *)sysmalloc ( m_memtablesize*16 );
s_isnew = (char *)sysmalloc ( m_memtablesize );
if ( ! s_mptrs || ! s_sizes || ! s_labels || ! s_isnew ) {
if ( s_mptrs ) sysfree ( s_mptrs );
if ( s_sizes ) sysfree ( s_sizes );
if ( s_labels ) sysfree ( s_labels );
if ( s_isnew ) sysfree ( s_isnew );
log("mem: addMem: Init failed. Disabling checks.");
g_conf.m_detectMemLeaks = false;
return;
}
s_initialized = true;
memset ( s_mptrs , 0 , sizeof(char *) * m_memtablesize );
}
// try to add ptr/size/note to leak-detecting table
if ( (int32_t)s_n > (int32_t)m_memtablesize ) {
log("mem: addMem: No room in table for %s size=%" INT32 ".",
note,size);
// unlock for threads
//pthread_mutex_unlock ( &s_lock );
return;
}
// hash into table
uint32_t u = (PTRTYPE)mem * (PTRTYPE)0x4bf60ade;
uint32_t h = u % (uint32_t)m_memtablesize;
// chain to an empty bucket
int32_t count = (int32_t)m_memtablesize;
while ( s_mptrs[h] ) {
// if an occupied bucket as our same ptr then chances are
// we freed without calling rmMem() and a new addMem() got it
if ( s_mptrs[h] == mem ) {
// if we are being called from addnew(), the
// overloaded "operator new" function above should
// have stored a temp ptr in here... allow that, it
// is used in case an engineer forgets to call
// mnew() after calling new() so gigablast would never
// realize that the memory was allocated.
if ( s_sizes[h] == size &&
s_labels[h*16+0] == 'T' &&
s_labels[h*16+1] == 'M' &&
s_labels[h*16+2] == 'P' &&
s_labels[h*16+3] == 'M' &&
s_labels[h*16+4] == 'E' &&
s_labels[h*16+5] == 'M' )
goto skipMe;
log("mem: addMem: Mem already added. "
"rmMem not called? label=%c%c%c%c%c%c"
,s_labels[h*16+0]
,s_labels[h*16+1]
,s_labels[h*16+2]
,s_labels[h*16+3]
,s_labels[h*16+4]
,s_labels[h*16+5]
);
char *xx = NULL; *xx = 0; //sleep(50000);
}
h++;
if ( h == m_memtablesize ) h = 0;
if ( --count == 0 ) {
log("mem: addMem: Mem table is full.");
printMem();
char *xx = NULL; *xx = 0; //sleep(50000);
}
}
// add to debug table
s_mptrs [ h ] = mem;
s_sizes [ h ] = size;
s_isnew [ h ] = isnew;
//log("adding %" INT32 " size=%" INT32 " to [%" INT32 "] #%" INT32 " (%s)",
//(int32_t)mem,size,h,s_n,note);
s_n++;
// debug
if ( (size > MINMEM && g_conf.m_logDebugMemUsage) || size>=100000000 )
log(LOG_INFO,"mem: addMem(%" INT32 "): %s. ptr=0x%" PTRFMT " "
"used=%" INT64 "",
size,note,(PTRTYPE)mem,m_used);
// now update used mem
// we do this here now since we always call addMem() now
m_used += size;
m_numAllocated++;
m_numTotalAllocated++;
if ( size > m_maxAlloc ) { m_maxAlloc = size; m_maxAllocBy = note; }
if ( m_used > m_maxAlloced ) m_maxAlloced = m_used;
skipMe:
int32_t len = gbstrlen(note);
if ( len > 15 ) len = 15;
char *here = &s_labels [ h * 16 ];
gbmemcpy ( here , note , len );
// make sure NULL terminated
here[len] = '\0';
// unlock for threads
//pthread_mutex_unlock ( &s_lock );
//validate();
}
#define PRINT_TOP 40
class MemEntry {
public:
int32_t m_hash;
char *m_label;
int32_t m_allocated;
int32_t m_numAllocs;
};
// print out the mem table
// but combine allocs with the same label
// sort by mem allocated
bool Mem::printMemBreakdownTable ( SafeBuf* sb,
char *lightblue,
char *darkblue) {
char *ss = "";
// make sure the admin viewing this table knows that there will be
// frees in here that are delayed if electric fence is enabled.
#ifdef EFENCE
ss = " <font color=red>*DELAYED FREES ENABLED*</font>";
#endif
sb->safePrintf (
"<table>"
"<table %s>"
"<tr>"
"<td colspan=3 bgcolor=#%s>"
"<center><b>Mem Breakdown%s</b></td></tr>\n"
"<tr bgcolor=#%s>"
"<td><b>allocator</b></td>"
"<td><b>num allocs</b></td>"
"<td><b>allocated</b></td>"
"</tr>" ,
TABLE_STYLE, darkblue , ss , darkblue );
int32_t n = m_numAllocated * 2;
MemEntry *e = (MemEntry *)mcalloc ( sizeof(MemEntry) * n , "Mem" );
if ( ! e ) {
log("admin: Could not alloc %" INT32 " bytes for mem table.",
(int32_t)sizeof(MemEntry)*n);
return false;
}
// hash em up, combine allocs of like label together for this hash
for ( int32_t i = 0 ; i < (int32_t)m_memtablesize ; i++ ) {
// skip empty buckets
if ( ! s_mptrs[i] ) continue;
// get label ptr, use as a hash
char *label = &s_labels[i*16];
int32_t h = hash32n ( label );
if ( h == 0 ) h = 1;
// accumulate the size
int32_t b = (uint32_t)h % n;
// . chain till we find it or hit empty
// . use the label as an indicator if bucket is full or empty
while ( e[b].m_hash && e[b].m_hash != h )
if ( ++b >= n ) b = 0;
// add it in
e[b].m_hash = h;
e[b].m_label = label;
e[b].m_allocated += s_sizes[i];
e[b].m_numAllocs++;
}
// get the top 20 users of mem
MemEntry *winners [ PRINT_TOP ];
int32_t i = 0;
int32_t count = 0;
for ( ; i < n && count < PRINT_TOP ; i++ )
// if non-empty, add to winners array
if ( e[i].m_hash ) winners [ count++ ] = &e[i];
// compute new min
int32_t min = 0x7fffffff;
int32_t mini = -1000;
for ( int32_t j = 0 ; j < count ; j++ ) {
if ( winners[j]->m_allocated > min ) continue;
min = winners[j]->m_allocated;
mini = j;
}
// now the rest must compete
for ( ; i < n ; i++ ) {
// if empty skip
if ( ! e[i].m_hash ) continue;
//if ( e[i].m_allocated > 120 && e[i].m_allocated < 2760 )
// log("hey %" INT32 "", e[i].m_allocated);
// skip if not a winner
if ( e[i].m_allocated <= min ) continue;
// replace the lowest winner
winners[mini] = &e[i];
// compute new min
min = 0x7fffffff;
for ( int32_t j = 0 ; j < count ; j++ ) {
if ( winners[j]->m_allocated > min ) continue;
min = winners[j]->m_allocated;
mini = j;
}
}
// now sort them
bool flag = true;
while ( flag ) {
flag = false;
for ( int32_t i = 1 ; i < count ; i++ ) {
// no need to swap?
if ( winners[i-1]->m_allocated >=
winners[i]->m_allocated ) continue;
// swap
flag = true;
MemEntry *tmp = winners[i-1];
winners[i-1] = winners[i];
winners[i ] = tmp;
}
}
// now print into buffer
for ( int32_t i = 0 ; i < count ; i++ )
sb->safePrintf (
"<tr bgcolor=%s>"
"<td>%s</td>"
"<td>%" INT32 "</td>"
"<td>%" INT32 "</td>"
"</tr>\n",
LIGHT_BLUE,
winners[i]->m_label,
winners[i]->m_numAllocs,
winners[i]->m_allocated);
sb->safePrintf ( "</table>\n");
// don't forget to release this mem
mfree ( e , (int32_t)sizeof(MemEntry) * n , "Mem" );
return true;
}
// Relabels memory in table. Returns true on success, false on failure.
// Purpose is for times when UdpSlot's buffer is not owned and freed by someone
// else. Now we can verify that passed memory is freed.
bool Mem::lblMem( void *mem, int32_t size, const char *note ) {
// seems to be a bad bug in this...
return true;
bool val = false;
// Make sure we're not relabeling a NULL or dummy memory address,
// if so, error then exit
if( !mem ){
//log( "mem: lblMem: Mem addr (0x%08X) invalid/NULL, not "
// "relabeling.", mem );
return val;
}
// else if( (uint32_t)mem == 0x7fffffff ) {
// //log( "mem: lblMem: Mem addr (0x%08X) is dummy address, not "
// // "relabeling.", mem );
// return val;
// }
uint32_t u = (PTRTYPE)mem * (PTRTYPE)0x4bf60ade;
uint32_t h = u % (uint32_t)m_memtablesize;
// chain to bucket
while( s_mptrs[h] ) {
if( s_mptrs[h] == mem ) {
if( s_sizes[h] != size ) {
val = false;
log( "mem: lblMem: Mem addr (0x%08" PTRFMT ") "
"exists, "
"size is %" INT32 " off.",
(PTRTYPE)mem,
s_sizes[h]-size );
break;
}
int32_t len = gbstrlen(note);
if ( len > 15 ) len = 15;
char *here = &s_labels [ h * 16 ];
gbmemcpy ( here , note , len );
// make sure NULL terminated
here[len] = '\0';
val = true;
break;
}
h++;
if ( h == m_memtablesize ) h = 0;
}
if( !val ) log( "mem: lblMem: Mem addr (0x%08" PTRFMT ") not found.",
(PTRTYPE)mem );
return val;
}
// this is called by C++ classes' destructors to unregister mem
bool Mem::rmMem ( void *mem , int32_t size , const char *note ) {
//validate();
// sanity check
if ( g_inSigHandler ) {
log(LOG_LOGIC,"mem: In sig handler 2.");
char *xx = NULL; *xx = 0;
}
// debug msg (mdw)
if ( g_conf.m_logDebugMem )
log("mem: free %08" PTRFMT " %" INT32 "bytes (%s)",
(PTRTYPE)mem,size,note);
//if ( strcmp(note,"RdbList") == 0 )
// log("mem: freelist%08"XINT32" %" INT32 "bytes (%s)",(int32_t)mem,size,note);
// check for breech after every call to alloc or free in order to
// more easily isolate breeching code.. this slows things down a lot
// though.
if ( g_conf.m_logDebugMem ) printBreeches(1);
// don't free 0 bytes
if ( size == 0 ) return true;
// hey!
if ( s_pid == -1 && m_numTotalAllocated >1000 ) {
log(LOG_WARN, "pid is %i and numAllocs is %i",
(int)s_pid, (int)m_numTotalAllocated);
//char *xx=NULL;*xx=0;}
}
// threads can't be here!
if ( s_pid != -1 && getpid() != s_pid ) {
log("mem: rmMem: Called from thread.");
sleep(50000);
// throw a bogus sig so we crash
char *xx=NULL;*xx=0;
//sigval_t svt;
//svt.sival_int = 1; // fd;
//sigqueue ( s_pid, GB_SIGRTMIN+1 , svt ) ;
//return true;
}
// lock for threads
//pthread_mutex_lock ( &s_lock );
// . hash by first hashing "mem" to mix it up some
// . balance the mallocs/frees
// . hash into table
uint32_t u = (PTRTYPE)mem * (PTRTYPE)0x4bf60ade;
uint32_t h = u % (uint32_t)m_memtablesize;
// . chain to an empty bucket
// . CAUTION: loops forever if no empty bucket
while ( s_mptrs[h] && s_mptrs[h] != mem ) {
h++;
if ( h == m_memtablesize ) h = 0;
}
// if not found, bitch
if ( ! s_mptrs[h] ) {
log("mem: rmMem: Unbalanced free. "
"note=%s size=%" INT32 ".",note,size);
// . return false for now to prevent coring
// . NOTE: but if entry was not added to table because there
// was no room, we really need to be decrementing m_used
// and m_numAllocated here
// . no, we should core otherwise it can result in some
// pretty hard to track down bugs later.
//return false;
#ifndef _VALGRIND_
char *xx = NULL;
*xx = 0;
#endif
//sleep(50000);
// unlock for threads
//pthread_mutex_unlock ( &s_lock );
return false;
}
// are we from the "new" operator
bool isnew = s_isnew[h];
// set our size
if ( size == -1 ) size = s_sizes[h];
// must be legit now
if ( size <= 0 ) { char *xx=NULL;*xx=0; }
// . bitch is sizes don't match
// . delete operator does not provide a size now (it's -1)
if ( s_sizes[h] != size ) {
log(
"mem: rmMem: Freeing %" INT32 " should be %" INT32 ". (%s)",
size,s_sizes[h],note);
if ( g_isYippy ) {
size = s_sizes[h];
goto keepgoing;
}
#ifndef _VALGRIND_
char *xx = NULL;
*xx = 0;
#endif
//sleep(50000);
// unlock for threads
//pthread_mutex_unlock ( &s_lock );
return false;
}
keepgoing:
// debug
if ( (size > MINMEM && g_conf.m_logDebugMemUsage) || size>=100000000 )
log(LOG_INFO,"mem: rmMem (%" INT32 "): "
"ptr=0x%" PTRFMT " %s.",size,(PTRTYPE)mem,note);
//
// we do this here now since we always call rmMem() now
//
// decrement freed mem
m_used -= size;
// new/delete does not have padding because the "new"
// function can't support it right now
//if ( ! isnew ) m_used -= (UNDERPAD + OVERPAD);
m_numAllocated--;
// check for breeches, if we don't do it here, we won't be able
// to check this guy for breeches later, cuz he's getting
// removed
if ( ! isnew ) printBreech ( h , 1 );
// empty our bucket, and point to next bucket after us
s_mptrs[h++] = NULL;
// dec the count
s_n--;
// wrap if we need to
if ( h >= m_memtablesize ) h = 0;
// var decl.
uint32_t k;
// shit after us may has to be rehashed in case it chained over us
while ( s_mptrs[h] ) {
// get mem ptr in bucket #h
char *mem = (char *)s_mptrs[h];
// find the most wanted bucket for this mem ptr
u = (PTRTYPE)mem * (PTRTYPE)0x4bf60ade;
k= u % (uint32_t)m_memtablesize;
// if it's in it, continue
if ( k == h ) { h++; continue; }
// otherwise, move it back to fill the gap
s_mptrs[h] = NULL;
// dec count
//s_n--;
// if slot #k is full, chain
for ( ; s_mptrs[k] ; )
if ( ++k >= m_memtablesize ) k = 0;
// re-add it to table
s_mptrs[k] = (void *)mem;
s_sizes[k] = s_sizes[h];
s_isnew[k] = s_isnew[h];
gbmemcpy(&s_labels[k*16],&s_labels[h*16],16);
// try next bucket now
h++;
// wrap if we need to
if ( h >= m_memtablesize ) h = 0;
}
//validate();
// unlock for threads
//pthread_mutex_unlock ( &s_lock );
return true;
}
int32_t Mem::validate ( ) {
if ( ! s_mptrs ) return 1;
// stock up "p" and compute total bytes allocated
int64_t total = 0;
int32_t count = 0;
for ( int32_t i = 0 ; i < (int32_t)m_memtablesize ; i++ ) {
// skip empty buckets
if ( ! s_mptrs[i] ) continue;
total += s_sizes[i];
count++;
}
// see if it matches
if ( total != m_used ) { char *xx=NULL;*xx=0; }
if ( count != m_numAllocated ) { char *xx=NULL;*xx=0; }
return 1;
}
int32_t Mem::getMemSlot ( void *mem ) {
// hash into table
uint32_t u = (PTRTYPE)mem * (PTRTYPE)0x4bf60ade;
uint32_t h = u % (uint32_t)m_memtablesize;
// . chain to an empty bucket
// . CAUTION: loops forever if no empty bucket
while ( s_mptrs[h] && s_mptrs[h] != mem ) {
h++;
if ( h == m_memtablesize ) h = 0;
}
// if not found, return -1
if ( ! s_mptrs[h] ) return -1;
return h;
}
int Mem::printBreech ( int32_t i , char core ) {
// skip if empty
if ( ! s_mptrs ) return 0;
if ( ! s_mptrs[i] ) return 0;
// skip if isnew is true, no padding there
if ( s_isnew[i] ) return 0;
// if no label!
if ( ! s_labels[i*16] )
log(LOG_LOGIC,"mem: NO label found.");
// do not test "Stack" allocated in Threads.cpp because it
// uses mprotect() which messes up the magic chars
if ( s_labels[i*16+0] == 'T' &&
s_labels[i*16+1] == 'h' &&
!strcmp(&s_labels[i*16 ],"ThreadStack" ) ) return 0;
#ifdef SPECIAL
// for now this is efence. umsg00
bool useElectricFence = false;
if ( s_labels[i*16+0] == 'u' &&
s_labels[i*16+1] == 'm' &&
s_labels[i*16+2] == 's' &&
s_labels[i*16+3] == 'g' &&
s_labels[i*16+4] == '0' &&
s_labels[i*16+5] == '0' )
useElectricFence = true;
if ( useElectricFence ) return 0;
#endif
char flag = 0;
// check for underruns
char *mem = (char *)s_mptrs[i];
char *bp = NULL;
for ( int32_t j = 0 ; j < UNDERPAD ; j++ ) {
if ( (unsigned char)mem[0-j-1] == MAGICCHAR ) continue;
log(LOG_LOGIC,"mem: underrun at %" PTRFMT " loff=%" INT32 " "
"size=%" INT32 " "
"i=%" INT32 " note=%s",
(PTRTYPE)mem,0-j-1,(int32_t)s_sizes[i],i,&s_labels[i*16]);
// mark it for freed mem re-use check below
if ( ! bp ) bp = &mem[0-j-1];
// now scan the whole hash table and find the mem buffer
// just before that! but only do this once
if ( flag == 1 ) continue;
PTRTYPE min = 0;
int32_t mink = -1;
for ( int32_t k = 0 ; k < (int32_t)m_memtablesize ; k++ ) {
// skip empties
if ( ! s_mptrs[k] ) continue;
// do not look at mem after us
if ( (PTRTYPE)s_mptrs[k] >= (PTRTYPE)mem )
continue;
// get min diff
if ( mink != -1 && (PTRTYPE)s_mptrs[k] < min )
continue;
// new winner
min = (PTRTYPE)s_mptrs[k];
mink = k;
}
// now report it
if ( mink == -1 ) continue;
log("mem: possible breeching buffer=%s dist=%" UINT32 ,
&s_labels[mink*16],
(uint32_t)(
(PTRTYPE)mem-
((PTRTYPE)s_mptrs[mink]+(uint32_t)s_sizes[mink])));
flag = 1;
}
// check for overruns
int32_t size = s_sizes[i];
for ( int32_t j = 0 ; j < OVERPAD ; j++ ) {
if ( (unsigned char)mem[size+j] == MAGICCHAR ) continue;
log(LOG_LOGIC,"mem: overrun at 0x%" PTRFMT " (size=%" INT32 ")"
"roff=%" INT32 " note=%s",
(PTRTYPE)mem,size,j,&s_labels[i*16]);
// mark it for freed mem re-use check below
if ( ! bp ) bp = &mem[size+j];
// now scan the whole hash table and find the mem buffer
// just before that! but only do this once
if ( flag == 1 ) continue;
PTRTYPE min = 0;
int32_t mink = -1;
for ( int32_t k = 0 ; k < (int32_t)m_memtablesize ; k++ ) {
// skip empties
if ( ! s_mptrs[k] ) continue;
// do not look at mem before us
if ( (PTRTYPE)s_mptrs[k] <= (PTRTYPE)mem )
continue;
// get min diff
if ( mink != -1 && (PTRTYPE)s_mptrs[k] > min )
continue;
// new winner
min = (PTRTYPE)s_mptrs[k];
mink = k;
}
// now report it
if ( mink == -1 ) continue;
log("mem: possible breeching buffer=%s at 0x%" PTRFMT " "
"breaching at offset of %" PTRFMT " bytes",
&s_labels[mink*16],
(PTRTYPE)s_mptrs[mink],
(PTRTYPE)s_mptrs[mink]-((PTRTYPE)mem+s_sizes[i]));
flag = 1;
}
// return now if no breach
if ( flag == 0 ) return 1;
// need this
if ( ! bp ) { char *xx=NULL;*xx=0; }
/*
//
// check for freed memory re-use
//
FreeInfo *fi = s_cursor;
FreeInfo *end = s_cursorEnd;
if ( ! s_looped ) end = s_cursor;
for ( ; ; ) {
// decrement
fi--;
// wrap?
if ( fi < s_cursorStart ) {
// do not wrap if did not loop though!
if ( ! s_looped ) break;
// otherwise, wrap back to top
fi = s_cursorEnd - 1;
}
// see if contains an overwritten magic char
if ( bp >= (char *)fi->m_ptr &&
bp < (char *)fi->m_ptr + fi->m_size ) {
log("mem: reused freed buffer note=%s",
fi->m_note);
break;
}
// all done?
if ( fi == s_cursor ) break;
}
*/
if ( flag && core ) { char *xx = NULL; *xx = 0; }
return 1;
}
// check all allocated memory for buffer under/overruns
int Mem::printBreeches ( char core ) {
if ( ! s_mptrs ) return 0;
// do not bother if no padding at all
if ( (int32_t)UNDERPAD == 0 && (int32_t)OVERPAD == 0 ) return 0;
log("mem: checking mem for breeches");
// loop through the whole mem table
for ( int32_t i = 0 ; i < (int32_t)m_memtablesize ; i++ )
// only check if non-empty
if ( s_mptrs[i] ) printBreech ( i , core );
return 0;
}
int Mem::printMem ( ) {
// has anyone breeched their buffer?
printBreeches ( 0 ) ;
// print table entries sorted by most mem first
int32_t *p = (int32_t *)sysmalloc ( m_memtablesize * 4 );
if ( ! p ) return 0;
// stock up "p" and compute total bytes allocated
int64_t total = 0;
int32_t np = 0;
for ( int32_t i = 0 ; i < (int32_t)m_memtablesize ; i++ ) {
// skip empty buckets
if ( ! s_mptrs[i] ) continue;
total += s_sizes[i];
p[np++] = i;
}
// . sort p by size
// . skip this because it blocks for like 30 seconds
bool flag ;
goto skipsort;
flag = 1;
while ( flag ) {
flag = 0;
for ( int32_t i = 1 ; i < np ; i++ ) {
int32_t a = p[i-1];
int32_t b = p[i ];
if ( s_sizes[a] <= s_sizes[b] ) continue;
// switch these 2
p[i ] = a;
p[i-1] = b;
flag = 1;
}
}
skipsort:
// print out table sorted by sizes
for ( int32_t i = 0 ; i < np ; i++ ) {
int32_t a = p[i];
//if ( strcmp((char *)&s_labels[a*16],"umsg20") == 0 )
// log("hey");
log(LOG_INFO,"mem: %05" INT32 ") %" INT32 " 0x%" PTRFMT " %s",
i,s_sizes[a] , (PTRTYPE)s_mptrs[a] , &s_labels[a*16] );
}
sysfree ( p );
log(LOG_INFO,"mem: # current objects allocated now = %" INT32 "", np );
log(LOG_INFO,"mem: totalMem allocated now = %" INT64 "", total );
//log("mem: max allocated at one time = %" INT32 "", (int32_t)(m_maxAlloced));
log(LOG_INFO,"mem: Memory allocated now: %" INT64 ".\n", getUsedMem() );
log(LOG_INFO,"mem: Num allocs %" INT32 ".\n", m_numAllocated );
return 1;
}
void *Mem::gbmalloc ( int size , const char *note ) {
// don't let electric fence zap us
if ( size == 0 ) return (void *)0x7fffffff;
// random oom testing
//static int32_t s_mcount = 0;
//s_mcount++;
if ( g_conf.m_testMem && (rand() % 100) < 2 ) {
//if ( s_mcount > 1055 && (rand() % 1000) < 2 ) {
g_errno = ENOMEM;
log("mem: malloc-fake(%i,%s): %s",size,note,
mstrerror(g_errno));
return NULL;
}
retry:
// hack so hostid #0 can use more mem
int64_t max = g_conf.m_maxMem;
//if ( g_hostdb.m_hostId == 0 ) max += 2000000000;
// don't go over max
if ( m_used + size + UNDERPAD + OVERPAD >= max ) {
// try to free temp mem. returns true if it freed some.
if ( freeCacheMem() ) goto retry;
g_errno = ENOMEM;
log("mem: malloc(%i): Out of memory", size );
return NULL;
}
if ( size < 0 ) {
g_errno = EBADENGINEER;
log("mem: malloc(%i): Bad value.", size );
char *xx = NULL; *xx = 0;
return NULL;
}
void *mem;
g_inMemFunction = true;
// to find bug that cores on malloc do this
//printBreeches(true);
//g_errno=ENOMEM;return (void *)log("Mem::malloc: reached mem limit");}
#ifdef EFENCE
mem = getElecMem(size+UNDERPAD+OVERPAD);
// conditional electric fence?
#elif EFENCE_SIZE
if ( size >= EFENCE_SIZE )
mem = getElecMem(size+0+0);
else
mem = (void *)sysmalloc ( size + UNDERPAD + OVERPAD );
#else
#ifdef SPECIAL
// debug where tagrec in xmldoc.cpp's msge0 tag list is overrunning
// for umsg00
bool useElectricFence = false;
if ( note[0] == 'u' &&
note[1] == 'm' &&
note[2] == 's' &&
note[3] == 'g' &&
note[4] == '0' &&
note[5] == '0' )
useElectricFence = true;
if ( useElectricFence ) {
mem = getElecMem(size+0+0);
addMem ( (char *)mem + 0 , size , note , 0 );
return (char *)mem + 0;
}
#endif
//void *mem = dlmalloc ( size );
mem = (void *)sysmalloc ( size + UNDERPAD + OVERPAD );
#endif
g_inMemFunction = false;
// initialization debug
//char *pend = (char *)mem + UNDERPAD + size;
//for ( char *p = (char *)mem + UNDERPAD ; p < pend ; p++ )
// *p = (char )(rand() % 256);
// test mem fragmentation email
//static int32_t s_count = 0;
//s_count++;
//if ( s_count > 1500 && (rand() % 100) < 2 ) {
// log("mem: malloc-system(%i,%s): %s",size,note,
// mstrerror(g_errno));
// mem = NULL;
//}
// special log
//if ( size > 1000000 )
// log("allocated %i. (%s) current=%" INT64 "",size,note,m_used);
//void *mem = s_pool.malloc ( size );
int32_t memLoop = 0;
mallocmemloop:
if ( ! mem && size > 0 ) {
g_mem.m_outOfMems++;
// try to free temp mem. returns true if it freed some.
if ( freeCacheMem() ) goto retry;
g_errno = errno;
static int64_t s_lastTime;
static int32_t s_missed = 0;
int64_t now = gettimeofdayInMillisecondsLocal();
int64_t avail = (int64_t)g_conf.m_maxMem -
(int64_t)m_used;
if ( now - s_lastTime >= 1000LL ) {
log("mem: system malloc(%i,%s) availShouldBe=%" INT64 ": "
"%s (%s) (ooms suppressed since "
"last log msg = %" INT32 ")",
size+UNDERPAD+OVERPAD,
note,
avail,
mstrerror(g_errno),
note,
s_missed);
s_lastTime = now;
s_missed = 0;
}
else
s_missed++;
// to debug oom issues:
//char *xx=NULL;*xx=0;
// send an email alert if this happens! it is a sign of
// "memory fragmentation"
//static bool s_sentEmail = false;
// stop sending these now... seems to be problematic. says
// 160MB is avail and can't alloc 20MB...
static bool s_sentEmail = true;
// assume only 90% is really available because of
// inefficient mallocing
avail = (int64_t)((float)avail * 0.80);
// but if it is within about 15MB of what is theoretically
// available, don't send an email, because there is always some
// minor fragmentation
if ( ! s_sentEmail && avail > size ) {
s_sentEmail = true;
char msgbuf[1024];
Host *h = g_hostdb.m_myHost;
snprintf(msgbuf, 1024,
"Possible memory fragmentation "
"on host #%" INT32 " %s",
h->m_hostId,h->m_note);
log(LOG_WARN, "query: %s",msgbuf);
g_pingServer.sendEmail(NULL, msgbuf,true,true);
}
return NULL;
}
if ( (PTRTYPE)mem < 0x00010000 ) {
#ifdef EFENCE
void *remem = getElecMem(size);
#else
void *remem = sysmalloc(size);
#endif
log ( LOG_WARN, "mem: Caught low memory allocation "
"at %08" PTRFMT ", "
"reallocated to %08" PTRFMT "",
(PTRTYPE)mem, (PTRTYPE)remem );
#ifdef EFENCE
freeElecMem (mem);
#else
sysfree(mem);
#endif
mem = remem;
memLoop++;
if ( memLoop > 100 ) {
log ( LOG_WARN, "mem: Attempted to reallocate low "
"memory allocation 100 times, "
"aborting and returning NOMEM." );
g_errno = ENOMEM;
return NULL;
}
goto mallocmemloop;
}
addMem ( (char *)mem + UNDERPAD , size , note , 0 );
return (char *)mem + UNDERPAD;
}
void *Mem::gbcalloc ( int size , const char *note ) {
void *mem = gbmalloc ( size , note );
// init it
if ( mem ) memset ( mem , 0, size );
return mem;
}
void *Mem::gbrealloc ( void *ptr , int oldSize , int newSize ,
const char *note ) {
// return dummy values since realloc() returns NULL if failed
if ( oldSize == 0 && newSize == 0 ) return (void *)0x7fffffff;
// do nothing if size is same
if ( oldSize == newSize ) return ptr;
// crazy?
if ( newSize < 0 ) { char *xx=NULL;*xx=0; }
// if newSize is 0...
if ( newSize == 0 ) {
//mfree ( ptr , oldSize , note );
gbfree ( ptr , oldSize , note );
return (void *)0x7fffffff;
}
// don't do more than 128M at a time, it hurts pthread_create
//if ( newSize > MAXMEMPERCALL ) {
// g_errno = ENOMEM;
// log("Mem::realloc(%i): can only alloc %" INT32 " bytes per call",
// newSize,MAXMEMPERCALL);
// return NULL;
//}
retry:
// hack so hostid #0 can use more mem
int64_t max = g_conf.m_maxMem;
//if ( g_hostdb.m_hostId == 0 ) max += 2000000000;
// don't go over max
if ( m_used + newSize - oldSize >= max ) {
// try to free temp mem. returns true if it freed some.
if ( freeCacheMem() ) goto retry;
g_errno = ENOMEM;
log("mem: realloc(%i,%i): Out of memory.",oldSize,newSize);
return NULL;
}
// if oldSize is 0, use our malloc() instead
if ( oldSize == 0 ) return gbmalloc ( newSize , note );
char *mem;
// even though size may be < 100k for EFENCE_SIZE, do it this way
// for simplicity...
#if defined(EFENCE) || defined(EFENCE_SIZE)
mem = (char *)mmalloc ( newSize , note );
if ( ! mem ) return NULL;
// copy over to it
gbmemcpy ( mem , ptr , oldSize );
// free the old
mfree ( ptr , oldSize , note );
// done
return mem;
#endif
#ifdef SPECIAL
int32_t slot = g_mem.getMemSlot ( ptr );
// debug where tagrec in xmldoc.cpp's msge0 tag list is overrunning
// for umsg00
if ( slot >= 0 ) {
char *label = &s_labels[slot*16];
bool useElectricFence = false;
if ( label[0] == 'u' &&
label[1] == 'm' &&
label[2] == 's' &&
label[3] == 'g' &&
label[4] == '0' &&
label[5] == '0' )
useElectricFence = true;
if ( useElectricFence ) {
// just make a new buf
mem = (char *)mmalloc ( newSize , note );
if ( ! mem ) return NULL;
// copy over to it
gbmemcpy ( mem , ptr , oldSize );
// free the old
mfree ( ptr , oldSize , note );
return mem;
}
}
#endif
// assume it will be successful. we can't call rmMem() after
// calling sysrealloc() because it will mess up our MAGICCHAR buf
rmMem ( ptr , oldSize , note );
// . do the actual realloc
// . CAUTION: don't pass in 0x7fffffff in as "ptr"
// . this was causing problems
mem = (char *)sysrealloc ( (char *)ptr - UNDERPAD ,
newSize + UNDERPAD + OVERPAD);
// remove old guy on success
if ( mem ) {
addMem ( (char *)mem + UNDERPAD , newSize , note , 0 );
char *returnMem = mem + UNDERPAD;
// set magic char bytes for mem
for ( int32_t i = 0 ; i < UNDERPAD ; i++ )
returnMem[0-i-1] = MAGICCHAR;
for ( int32_t i = 0 ; i < OVERPAD ; i++ )
returnMem[0+newSize+i] = MAGICCHAR;
return returnMem;
}
// ok, just try using malloc then!
mem = (char *)mmalloc ( newSize , note );
// bail on error
if ( ! mem ) {
g_mem.m_outOfMems++;
// restore the original buf we tried to grow
addMem ( ptr , oldSize , note , 0 );
errno = g_errno = ENOMEM;
return NULL;
}
// log a note
log(LOG_INFO,"mem: had to use malloc/gbmemcpy instead of "
"realloc.");
// copy over to it
gbmemcpy ( mem , ptr , oldSize );
// we already called rmMem() so don't double call
sysfree ( (char *)ptr - UNDERPAD );
// free the old. this was coring because it was double calling rmMem()
//mfree ( ptr , oldSize , note );
// mmalloc() and mfree() should have taken care of it
return mem;
}
char *Mem::dup ( const void *data , int32_t dataSize , const char *note ) {
// keep it simple
char *mem = (char *)mmalloc ( dataSize , note );
if ( mem ) gbmemcpy ( mem , data , dataSize );
return mem;
}
void Mem::gbfree ( void *ptr , int size , const char *note ) {
// don't let electric fence zap us
//if ( size == 0 && ptr==(void *)0x7fffffff) return;
if ( size == 0 ) return;
// huh?
if ( ! ptr ) return;
//if ( size==65536 && strcmp(note,"UdpServer")==0)
// log("hey");
// . get how much it was from the mem table
// . this is used for alloc/free wrappers for zlib because it does
// not give us a size to free when it calls our mfree(), so we use -1
int32_t slot = g_mem.getMemSlot ( ptr );
if ( slot < 0 ) {
log(LOG_LOGIC,"mem: could not find slot (note=%s)",note);
//log(LOG_LOGIC,"mem: FIXME!!!");
// return for now so procog does not core all the time!
return;
//char *xx = NULL; *xx = 0;
}
bool isnew = s_isnew[slot];
#ifdef EFENCE
// this does a delayed free so do not call rmMem() just yet
freeElecMem ((char *)ptr - UNDERPAD );
return;
#endif
#ifdef EFENCE_SIZE
if ( size == -1 ) size = s_sizes[slot];
if ( size >= EFENCE_SIZE ) {
freeElecMem ((char *)ptr - 0 );
return;
}
#endif
#ifdef SPECIAL
g_inMemFunction = true;
// debug where tagrec in xmldoc.cpp's msge0 tag list is overrunning
// for umsg00
bool useElectricFence = false;
char *label = &s_labels[slot*16];
if ( label[0] == 'u' &&
label[1] == 'm' &&
label[2] == 's' &&
label[3] == 'g' &&
label[4] == '0' &&
label[5] == '0' )
useElectricFence = true;
if ( useElectricFence ) {
// this calls rmMem() itself
freeElecMem ((char *)ptr - 0 );
g_inMemFunction = false;
// if this returns false it was an unbalanced free
//if ( ! rmMem ( ptr , size , note ) ) return;
return;
}
g_inMemFunction = false;
#endif
// if this returns false it was an unbalanced free
if ( ! rmMem ( ptr , size , note ) ) return;
g_inMemFunction = true;
if ( isnew ) sysfree ( (char *)ptr );
else sysfree ( (char *)ptr - UNDERPAD );
g_inMemFunction = false;
}
int32_t getLowestLitBitLL ( uint64_t bits ) {
// count how many bits we have to shift so that the first bit is 0
int32_t shift = 0;
while ( (bits & (1LL<<shift)) == 0 && (shift < 63 ) ) shift++;
return shift;
}
uint32_t getHighestLitBitValue ( uint32_t bits ) {
// count how many bits we have to shift so that the first bit is 0
uint32_t highest = 0;
for ( int32_t shift = 0 ; shift < 32 ; shift++ )
if ( bits & (1<<shift) ) highest = (1 << shift);
return highest;
}
uint64_t getHighestLitBitValueLL ( uint64_t bits ) {
// count how many bits we have to shift so that the first bit is 0
uint64_t highest = 0;
for ( int32_t shift = 0 ; shift < 64 ; shift++ )
if ( bits & (1LL<<shift) ) highest = (1LL << shift);
return highest;
}
// TODO: speed up
int64_t htonll ( uint64_t a ) {
int64_t b;
unsigned int int0 = htonl ( ((uint32_t *)&a)[0] );
unsigned int int1 = htonl ( ((uint32_t *)&a)[1] );
((unsigned int *)&b)[0] = int1;
((unsigned int *)&b)[1] = int0;
return b;
}
// just swap 'em back
int64_t ntohll ( uint64_t a ) {
return htonll ( a );
}
key_t htonkey ( key_t key ) {
key_t newKey;
newKey.n0 = htonll ( key.n0 );
newKey.n1 = htonl ( key.n1 );
return newKey;
}
key_t ntohkey ( key_t key ) {
key_t newKey;
newKey.n0 = ntohll ( key.n0 );
newKey.n1 = ntohl ( key.n1 );
return newKey;
}
// this can be sped up drastiaclly if needed
uint32_t reverseBits ( uint32_t x ) {
// init groupId
uint32_t y = 0;
// go through each bit in hostId
for ( int32_t srcBit = 0 ; srcBit < 32 ; srcBit++ ) {
// get status of bit # srcBit
bool isOn = x & (1 << srcBit);
// set destination bit in the groupId
if ( isOn ) y |= (1 << (31 - srcBit) );
}
// return the bit reversal of x
return y;
}
// . returns -1 if dst < src, 0 if equal, +1 if dst > src
// . bit #0 is the least significant bit on this little endian machine
// . TODO: should we speed this up?
int32_t membitcmp ( void *dst ,
int32_t dstBits , // bit offset into "dst"
void *src ,
int32_t srcBits , // bit offset into "src"
int32_t nb ) { // # bits to compare
char *s;
char *d;
char smask;
char dmask;
for ( int32_t b = nb - 1 ; b >= 0 ; b-- ) {
s =(char *)src + ((b + srcBits) >> 3 );
d =(char *)dst + ((b + dstBits) >> 3 );
smask = 0x01 << ((b + srcBits) & 0x07);
dmask = 0x01 << ((b + dstBits) & 0x07);
if ( *s & smask ) { if ( ! (*d & dmask) ) return -1; }
else { if ( *d & dmask ) return 1; }
}
return 0;
}
// . returns # of bits in common
// . bit #0 is the least significant bit on this little endian machine
// . TODO: should we speed this up?
int32_t membitcmp2 ( void *dst ,
int32_t dstBits , // bit offset into "dst"
void *src ,
int32_t srcBits , // bit offset into "src"
int32_t nb ) { // # bits to compare
char *s;
char *d;
char smask;
char dmask;
int32_t nc = 0;
for ( int32_t b = nb - 1 ; b >= 0 ; b-- ) {
s =(char *)src + ((b + srcBits) >> 3 );
d =(char *)dst + ((b + dstBits) >> 3 );
smask = 0x01 << ((b + srcBits) & 0x07);
dmask = 0x01 << ((b + dstBits) & 0x07);
if ( *s & smask ) { if ( ! (*d & dmask) ) return nc; }
else { if ( *d & dmask ) return nc; }
nc++;
}
return nc;
}
// . bit #0 is the least significant bit on this little endian machine
// . TODO: should we speed this up?
// . we start copying at LOW bit
void membitcpy1 ( void *dst ,
int32_t dstBits , // bit offset into "dst"
void *src ,
int32_t srcBits , // bit offset into "src"
int32_t nb ) { // # bits to copy
// debug msg
//log("nb=%" INT32 "",nb);
// if src and dst overlap, it matters if b moves up or down
char *s;
char *d;
char smask;
char dmask;
for ( int32_t b = 0 ; b < nb ; b++ ) {
s =(char *)src + ((b + srcBits) >> 3 );
d =(char *)dst + ((b + dstBits) >> 3 );
smask = 0x01 << ((b + srcBits) & 0x07);
dmask = 0x01 << ((b + dstBits) & 0x07);
if ( *s & smask ) *d |= dmask;
else *d &= ~dmask;
}
}
// like above, but we start copying at HIGH bit so you can
// shift your recs without interference
void membitcpy2 ( void *dst ,
int32_t dstBits , // bit offset into "dst"
void *src ,
int32_t srcBits , // bit offset into "src"
int32_t nb ) { // # bits to copy
// if src and dst overlap, it matters if b moves up or down
char *s;
char *d;
char smask;
char dmask;
for ( int32_t b = nb - 1 ; b >= 0 ; b-- ) {
s =(char *)src + ((b + srcBits) >> 3 );
d =(char *)dst + ((b + dstBits) >> 3 );
smask = 0x01 << ((b + srcBits) & 0x07);
dmask = 0x01 << ((b + dstBits) & 0x07);
if ( *s & smask ) *d |= dmask;
else *d &= ~dmask;
}
}
int32_t Mem::printBits ( void *src, int32_t srcBits , int32_t nb ) {
char *s;
char smask;
fprintf(stdout,"low %" INT32 " bits = ",nb);
for ( int32_t b = 0 ; b < nb ; b++ ) {
s =(char *)src + ((b + srcBits) >> 3 );
smask = 0x01 << ((b + srcBits) & 0x07);
if ( *s & smask ) fprintf(stdout,"1");
else fprintf(stdout,"0");
}
fprintf(stdout,"\n");
return 0;
}
// ass = async signal safe, dumb ass
void memset_ass ( register void *dest , register const char c , int32_t len ) {
register char *end = (char *)dest + len;
// JAB: so... the optimizer should take care of the extra
// register declaration for d, below... see note below.
register char *d = (char *)dest;
// JAB: gcc-3.4 did not like the cast in the previous version
// while ( dest < end ) *((char *)dest)++ = c;
while ( d < end ) { *d++ = c; }
}
void memset_nice( register void *dest , register const char c , int32_t len ,
int32_t niceness ) {
char *end = (char *)dest + len;
// JAB: so... the optimizer should take care of the extra
// register declaration for d, below... see note below.
register char *d = (char *)dest;
// JAB: gcc-3.4 did not like the cast in the previous version
// while ( dest < end ) *((char *)dest)++ = c;
loop:
register char *seg = d + 5000;
if ( seg > end ) seg = end;
QUICKPOLL ( niceness );
while ( d < seg ) { *d++ = c; }
QUICKPOLL ( niceness );
// do more?
if ( d < end ) goto loop;
}
// . TODO: avoid byteCopy by copying remnant bytes
// . ass = async signal safe, dumb ass
// . NOTE: src/dest should not overlap in this version of gbmemcpy
// . MDW: i replaced this is a #define bcopy in gb-include.h
/*
void memcpy_ass ( register void *dest2, register const void *src2, int32_t len ) {
// for now keep it simple!!
len--;
while ( len >= 0 ) {
((char *)dest2)[len] = ((char *)src2)[len];
len--;
}
*/
/*
// debug test
//gbmemcpy ( dest2 , src2 , len );
//return;
// the end for the fast copy by word with partially unrolled loop
register int32_t *dest = (int32_t *)dest2;
register int32_t *src = (int32_t *)src2 ;
register int32_t *end = dest + (len >> 2);
int32_t *oldEnd = end;
//int64_t start = gettimeofdayInMilliseconds();
//fprintf(stderr,"ln=%" INT32 ",dest=%" INT32 ",src=%" INT32 "\n",len,(int32_t)dest,(int32_t)src);
if ((len&0x03)!=0 || ((int32_t)dest&0x03)!=0 || ((int32_t)src&0x03)!=0 )
goto byteCopy;
// truncate n so we can unroll this loop
end = (int32_t *) ( (int32_t)end & 0x07 );
while ( dest < end ) {
dest[0] = src[0];
dest[1] = src[1];
dest[2] = src[2];
dest[3] = src[3];
dest[4] = src[4];
dest[5] = src[5];
dest[6] = src[6];
dest[7] = src[7];
dest += 8;
src += 8;
}
// copy remaining 7 or less int32_ts
while ( dest < oldEnd ) { *dest = *src; dest++; src++; }
//fprintf(stderr,"t=%" INT32 "\n",(int32_t)(gettimeofdayInMilliseconds()-start));
return;
byteCopy:
len--;
while ( len >= 0 ) { dest2[len] = src2[len]; len--; }
*/
//}
// Check the current stack usage
int32_t Mem::checkStackSize() {
if ( !m_stackStart )
return 0;
char final;
char *stackEnd = &final;
int32_t size = m_stackStart - stackEnd;
log("gb: stack size is %" INT32 "",size);
return size;
}
// Set the stack's start point (called in main.cpp)
void Mem::setStackPointer( char *ptr ) {
m_stackStart = ptr;
}
char g_a[256] = { 0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8};
#include "Msg20.h"
bool freeCacheMem() {
// returns true if it did free some stuff
//if ( resetMsg20Cache() ) {
// log("mem: freed cache mem.");
// return true;
//}
return false;
}
#define MAXBEST 50
// scan all allocated memory, assume each byte is starting a character ptr,
// and find such ptrs closes to "target"
int32_t Mem::findPtr ( void *target ) {
if ( ! s_mptrs ) return 0;
PTRTYPE maxDelta = (PTRTYPE)-1;
PTRTYPE topDelta[MAXBEST];
PTRTYPE topOff [MAXBEST];
PTRTYPE topi [MAXBEST];
int32_t nt = 0;
int32_t minnt = 0;
int32_t i;
// loop through the whole mem table
for ( i = 0 ; i < (int32_t)m_memtablesize ; i++ ) {
// only check if non-empty
if ( ! s_mptrs[i] ) continue;
// get size to scan
char *p = (char *)s_mptrs[i];
int32_t size = s_sizes[i];
char *pend = p + size;
PTRTYPE bestDelta = (PTRTYPE)-1;
PTRTYPE bestOff = (PTRTYPE)-1;
char *note = &s_labels[i*16];
// skip thread stack
if ( strcmp(note,"ThreadStack") == 0 )
continue;
// scan that
for ( ; p +sizeof(char *) < pend ; p++ ) {
// get ptr it might have
//char *pp = (char *)(*(int32_t *)p);
char *pp = *(char **)p;
// delta from target
PTRTYPE delta = (PTRTYPE)pp - (PTRTYPE)target;
// make positive
if ( delta < 0 ) delta *= -1;
// is it a min?
//if ( delta > 100 ) continue;
// get top 10
if ( delta < bestDelta ) {
bestDelta = delta;
bestOff = (PTRTYPE)p - (PTRTYPE)(s_mptrs[i]);
}
}
// bail if not good enough
if ( bestDelta >= maxDelta ) continue;
if ( bestDelta > 50000 ) continue;
// add to top list
if ( nt < MAXBEST ) {
topDelta[nt] = bestDelta;
topOff [nt] = bestOff;
topi [nt] = i;
nt++;
}
else {
topDelta[minnt] = bestDelta;
topOff [minnt] = bestOff;
topi [minnt] = i;
}
// compute minnt
minnt = 0;
for ( int32_t j = 1 ; j < nt ; j++ )
if ( topDelta[j] > topDelta[minnt] )
minnt = j;
}
// print out top MAXBEST. "note" is the note attached to the allocated
// memory the suspicious write ptr is in
for ( int32_t j = 0 ; j < nt ; j++ ) {
// get it
PTRTYPE bi = topi[j];
char *note = (char *)&s_labels[bi*16];
if ( ! note ) note = "unknown";
PTRTYPE *x = (PTRTYPE *)((char *)s_mptrs[bi] + topOff[j]);
log("mem: topdelta=%" PTRFMT " bytes away from corrupted mem. "
"note=%s "
"memblock=%" PTRFMT " and memory of ptr is %" PTRFMT " "
"bytes into that "
"memblock. and ptr is pointing to 0x%" PTRFMT "(%" PTRFMT ")",
topDelta[j],
note,bi,topOff[j], *x,*x);
}
return 0;
}
//#include <limits.h> /* for MEMPAGESIZE */
#define MEMPAGESIZE ((uint32_t)(8*1024))
void *getElecMem ( int32_t size ) {
// a page above OR a page below
// let's go below this time since that seems to be the problem
#ifdef CHECKUNDERFLOW
// how much to alloc
// . assume sysmalloc returns one byte above a page, so we need
// MEMPAGESIZE-1 bytes to move p up to page boundary, another
// MEMPAGESIZE bytes for protected page, then the actual mem,
// THEN possibly another MEMPAGESIZE-1 bytes to hit the next page
// boundary for protecting the "freed" mem below, but can get
// by with (MEMPAGESIZE-(size%MEMPAGESIZE)) more
int32_t need = size + sizeof(char *)*2 + MEMPAGESIZE + MEMPAGESIZE ;
// want to end on a page boundary too!
need += (MEMPAGESIZE-(size%MEMPAGESIZE));
// get that
char *realMem = (char *)sysmalloc ( need );
if ( ! realMem ) return NULL;
// set it all to 0x11
memset ( realMem , 0x11 , need );
// use this
char *realMemEnd = realMem + need;
// parser
char *p = realMem;
// align p DOWN to nearest 8k boundary
int32_t remainder = (uint64_t)realMem % MEMPAGESIZE;
// complement
remainder = MEMPAGESIZE - remainder;
// and add to ptr to be aligned on 8k boundary
p += remainder;
// save that
char *protMem = p;
// skip that
p += MEMPAGESIZE;
// save this
char *returnMem = p;
// store the ptrs
*(char **)(returnMem- sizeof(char *)) = realMem;
*(char **)(returnMem- sizeof(char *)*2) = realMemEnd;
//log("protect2 0x%" PTRFMT "\n",(PTRTYPE)protMem);
// protect that after we wrote our ptr
if ( mprotect ( protMem , MEMPAGESIZE , PROT_NONE) < 0 )
log("mem: mprotect failed: %s",mstrerror(errno));
// advance over user data
p += size;
// now when we free this it should all be protected, so make sure
// we have enough room on top
int32_t leftover = MEMPAGESIZE - ((uint64_t)p % MEMPAGESIZE);
// skip that
p += leftover;
// inefficient?
if ( realMemEnd - p > (int32_t)MEMPAGESIZE ) { char *xx=NULL;*xx=0;}
// ensure we do not breach
if ( p > realMemEnd ) { char *xx=NULL;*xx=0; }
// test it, this should core
//protmem[0] = 32;
// return that for them
return returnMem;
#else
// how much to alloc
int32_t need = size + MEMPAGESIZE + MEMPAGESIZE + MEMPAGESIZE;
need += sizeof(char *)*2;
// get that
char *realMem = (char *)sysmalloc ( need );
if ( ! realMem ) return NULL;
// set it all to 0x11
memset ( realMem , 0x11 , need );
// use this
char *realMemEnd = realMem + need;
// get the end of it
char *end = realMemEnd;
// back down from what we need
end -= MEMPAGESIZE;
// get remainder from that
int32_t remainder = (PTRTYPE)end % MEMPAGESIZE;
// back down to that
char *protMem = end - remainder;
// get return mem
char *returnMem = protMem - size;
// back beyond that
int32_t leftover = (PTRTYPE)returnMem % MEMPAGESIZE;
// back up
char *p = returnMem - leftover;
// we are now on a page boundary, so we can protect this mem
// after we "free" it below
if ( p < realMem ) { char *xx=NULL;*xx=0; }
// store mem ptrs before protecting
*(char **)(returnMem- sizeof(char *) ) = realMem;
*(char **)(returnMem- sizeof(char *)*2) = realMemEnd;
// sanity
if ( returnMem - sizeof(char *)*2 < realMem ) { char *xx=NULL;*xx=0; }
//log("protect3 0x%" PTRFMT "\n",(PTRTYPE)protMem);
// protect that after we wrote our ptr
if ( mprotect ( protMem , MEMPAGESIZE , PROT_NONE) < 0 )
log("mem: mprotect failed: %s",mstrerror(errno));
// test it, this should core
//protmem[0] = 32;
// return that for them
return returnMem;
#endif
}
// stuff for detecting if a class frees memory and then re-uses it after
// freeing it...
class FreeInfo {
public:
char *m_fakeMem;
int32_t m_fakeSize;
char *m_note;
char *m_realMem;
int32_t m_realSize;
char *m_protMem;
int32_t m_protSize;
};
static FreeInfo s_freeBuf[4000];
static FreeInfo *s_cursor = &s_freeBuf[0];
static FreeInfo *s_cursorEnd = &s_freeBuf[4000];
static FreeInfo *s_cursorStart = &s_freeBuf[0];
static bool s_looped = false;
static FreeInfo *s_freeCursor = &s_freeBuf[0];
static int64_t s_totalInRing = 0LL;
// . now we must unprotect before freeing
// . let's do delayed freeing because i think the nasty bug that is
// corrupting malloc's space is overruning a freed buffer perhaps?
void freeElecMem ( void *fakeMem ) {
// cast it
char *cp = (char *)fakeMem;
// get mem info from the hash table
int32_t h = g_mem.getMemSlot ( cp );
if ( h < 0 ) {
log("mem: unbalanced free ptr");
char *xx=NULL;*xx=0;
}
char *label = &s_labels[((uint32_t)h)*16];
int32_t fakeSize = s_sizes[h];
#ifdef CHECKUNDERFLOW
char *oldProtMem = cp - MEMPAGESIZE;
#else
char *oldProtMem = cp + fakeSize;
#endif
// hack
//oldProtMem -= 4;
//log("unprotect1 0x%" PTRFMT "\n",(PTRTYPE)oldProtMem);
// unprotect it
if ( mprotect ( oldProtMem , MEMPAGESIZE, PROT_READ|PROT_WRITE) < 0 )
log("mem: munprotect failed: %s",mstrerror(errno));
// now original memptr is right before "p" and we can
// read it now that we are unprotected
char *realMem = *(char **)(cp-sizeof(char *));
// set real mem end (no!?)
char *realMemEnd = *(char **)(cp-sizeof(char *)*2);
// set it all to 0x99
memset ( realMem , 0x99 , realMemEnd - realMem );
// ok, back up to page boundary before us
char *protMem = realMem + (MEMPAGESIZE -
(((PTRTYPE)realMem) % MEMPAGESIZE));
// get end point
char *protEnd = realMemEnd - ((PTRTYPE)realMemEnd % MEMPAGESIZE);
// sanity
if ( protMem < realMem ) { char *xx=NULL;*xx=0; }
if ( protMem - realMem > (int32_t)MEMPAGESIZE) { char *xx=NULL;*xx=0; }
//log("protect1 0x%" PTRFMT "\n",(PTRTYPE)protMem);
// before adding it into the ring, protect it
if ( mprotect ( protMem , protEnd-protMem, PROT_NONE) < 0 )
log("mem: mprotect2 failed: %s",mstrerror(errno));
// add our freed memory to the freed ring
if ( s_cursor > s_cursorEnd ) { char *xx=NULL;*xx=0; }
// to avoid losing free info by eating our own tail
if ( s_cursor == s_freeCursor && s_looped ) {
// free it
g_mem.rmMem ( s_freeCursor->m_fakeMem,
s_freeCursor->m_fakeSize,
s_freeCursor->m_note );
// log("unprotect2 0x%" PTRFMT "\n",
// (PTRTYPE)s_freeCursor->m_protMem);
// unprotect it
if ( mprotect (s_freeCursor->m_protMem,
s_freeCursor->m_protSize,
PROT_READ|PROT_WRITE) < 0 )
log("mem: munprotect2 failed: %s",mstrerror(errno));
// get the original mem and nuke
sysfree ( s_freeCursor->m_realMem );
// dec count. use fake mem size
s_totalInRing -= s_freeCursor->m_realSize;
// wrap it if we need to
if ( ++s_freeCursor == s_cursorEnd )
s_freeCursor = s_cursorStart;
}
s_cursor->m_fakeMem = cp;
s_cursor->m_fakeSize = fakeSize;
s_cursor->m_note = label;
s_cursor->m_realSize = realMemEnd - realMem;
s_cursor->m_realMem = realMem;
s_cursor->m_protMem = protMem;
s_cursor->m_protSize = protEnd - protMem;
// keep tabs on how much unfreed mem we need to free
s_totalInRing += s_cursor->m_realSize;
if ( ++s_cursor == s_cursorEnd ) {
s_looped = true;
s_cursor = s_cursorStart;
}
// now free beginning at s_freeCursor
for ( ; s_freeCursor != s_cursor && s_totalInRing > 150000000 ; ) {
// free it
g_mem.rmMem ( s_freeCursor->m_fakeMem,
s_freeCursor->m_fakeSize,
s_freeCursor->m_note );
// log("unprotect3 0x%" PTRFMT "\n",
// (PTRTYPE)s_freeCursor->m_protMem);
// unprotect it
if ( mprotect (s_freeCursor->m_protMem,
s_freeCursor->m_protSize,
PROT_READ|PROT_WRITE) < 0 )
log("mem: munprotect2 failed: %s",mstrerror(errno));
// get the original mem and nuke
sysfree ( s_freeCursor->m_realMem );
// dec count. use fake mem size
s_totalInRing -= s_freeCursor->m_realSize;
// wrap it if we need to
if ( ++s_freeCursor == s_cursorEnd )
s_freeCursor = s_cursorStart;
}
}
// only Mem.cpp can call ::malloc, everyone else must call mmalloc() so
// we can keep tabs on memory usage.
#define malloc coreme
#define calloc coreme
#define realloc coreme
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