X-Git-Url: http://git.xonotic.org/?p=xonotic%2Fdarkplaces.git;a=blobdiff_plain;f=zone.c;h=40708bd6913ed713811d61c4c8443446db09c806;hp=d61def1a021559333501f7d60432131eca9dfe55;hb=7ea07939bef0cbe85c54d9f68cb924198b0b1f64;hpb=95ed6d481f1ccbd2d39372acf2a38e2fc0b1782c diff --git a/zone.c b/zone.c index d61def1a..40708bd6 100644 --- a/zone.c +++ b/zone.c @@ -19,33 +19,41 @@ Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */ // Z_zone.c -#include "quakedef.h" +#include "darkplaces.h" #ifdef WIN32 #include +#include #else #include #endif -#ifdef _MSC_VER -#include -#else -#include -#endif #define MEMHEADER_SENTINEL_FOR_ADDRESS(p) ((sentinel_seed ^ (unsigned int) (uintptr_t) (p)) + sentinel_seed) unsigned int sentinel_seed; -qboolean mem_bigendian = false; +qbool mem_bigendian = false; +void *mem_mutex = NULL; + +// divVerent: enables file backed malloc using mmap to conserve swap space (instead of malloc) +#ifndef FILE_BACKED_MALLOC +# define FILE_BACKED_MALLOC 0 +#endif -// LordHavoc: enables our own low-level allocator (instead of malloc) -#define MEMCLUMPING 0 -#define MEMCLUMPING_FREECLUMPS 0 +// LadyHavoc: enables our own low-level allocator (instead of malloc) +#ifndef MEMCLUMPING +# define MEMCLUMPING 0 +#endif +#ifndef MEMCLUMPING_FREECLUMPS +# define MEMCLUMPING_FREECLUMPS 0 +#endif #if MEMCLUMPING // smallest unit we care about is this many bytes #define MEMUNIT 128 // try to do 32MB clumps, but overhead eats into this -#define MEMWANTCLUMPSIZE (1<<27) +#ifndef MEMWANTCLUMPSIZE +# define MEMWANTCLUMPSIZE (1<<27) +#endif // give malloc padding so we can't waste most of a page at the end #define MEMCLUMPSIZE (MEMWANTCLUMPSIZE - MEMWANTCLUMPSIZE/MEMUNIT/32 - 128) #define MEMBITS (MEMCLUMPSIZE / MEMUNIT) @@ -79,19 +87,68 @@ static memclump_t *clumpchain = NULL; #endif -cvar_t developer_memory = {0, "developer_memory", "0", "prints debugging information about memory allocations"}; -cvar_t developer_memorydebug = {0, "developer_memorydebug", "0", "enables memory corruption checks (very slow)"}; +cvar_t developer_memory = {CF_CLIENT | CF_SERVER, "developer_memory", "0", "prints debugging information about memory allocations"}; +cvar_t developer_memorydebug = {CF_CLIENT | CF_SERVER, "developer_memorydebug", "0", "enables memory corruption checks (very slow)"}; +cvar_t developer_memoryreportlargerthanmb = {CF_CLIENT | CF_SERVER, "developer_memorylargerthanmb", "16", "prints debugging information about memory allocations over this size"}; +cvar_t sys_memsize_physical = {CF_CLIENT | CF_SERVER | CF_READONLY, "sys_memsize_physical", "", "physical memory size in MB (or empty if unknown)"}; +cvar_t sys_memsize_virtual = {CF_CLIENT | CF_SERVER | CF_READONLY, "sys_memsize_virtual", "", "virtual memory size in MB (or empty if unknown)"}; static mempool_t *poolchain = NULL; void Mem_PrintStats(void); void Mem_PrintList(size_t minallocationsize); +#if FILE_BACKED_MALLOC +#include +#include +#ifndef MAP_NORESERVE +#define MAP_NORESERVE 0 +#endif +typedef struct mmap_data_s +{ + size_t len; +} +mmap_data_t; +static void *mmap_malloc(size_t size) +{ + char vabuf[MAX_OSPATH + 1]; + char *tmpdir = getenv("TEMP"); + mmap_data_t *data; + int fd; + size += sizeof(mmap_data_t); // waste block + dpsnprintf(vabuf, sizeof(vabuf), "%s/darkplaces.XXXXXX", tmpdir ? tmpdir : "/tmp"); + fd = mkstemp(vabuf); + if(fd < 0) + return NULL; + ftruncate(fd, size); + data = (unsigned char *) mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED | MAP_NORESERVE, fd, 0); + close(fd); + unlink(vabuf); + if(!data || data == (void *)-1) + return NULL; + data->len = size; + return (void *) (data + 1); +} +static void mmap_free(void *mem) +{ + mmap_data_t *data; + if(!mem) + return; + data = ((mmap_data_t *) mem) - 1; + munmap(data, data->len); +} +#define malloc mmap_malloc +#define free mmap_free +#endif + #if MEMCLUMPING != 2 // some platforms have a malloc that returns NULL but succeeds later // (Windows growing its swapfile for example) static void *attempt_malloc(size_t size) { +#ifndef WIN32 + return malloc(size); +#else void *base; // try for half a second or so unsigned int attempts = 500; @@ -103,6 +160,7 @@ static void *attempt_malloc(size_t size) Sys_Sleep(1000); } return NULL; +#endif } #endif @@ -147,14 +205,14 @@ static void *Clump_AllocBlock(size_t size) #if MEMCLUMPING if (size <= MEMCLUMPSIZE) { - int index; - unsigned int bit; - unsigned int needbits; - unsigned int startbit; - unsigned int endbit; - unsigned int needints; - int startindex; - int endindex; + intptr_t index; + size_t bit; + size_t needbits; + size_t startbit; + size_t endbit; + size_t needints; + intptr_t startindex; + intptr_t endindex; unsigned int value; unsigned int mask; unsigned int *array; @@ -258,10 +316,10 @@ nofreeblock: static void Clump_FreeBlock(void *base, size_t size) { #if MEMCLUMPING - unsigned int needbits; - unsigned int startbit; - unsigned int endbit; - unsigned int bit; + size_t needbits; + size_t startbit; + size_t endbit; + size_t bit; memclump_t **clumpchainpointer; memclump_t *clump; unsigned char *start = (unsigned char *)base; @@ -326,22 +384,29 @@ void *_Mem_Alloc(mempool_t *pool, void *olddata, size_t size, size_t alignment, return NULL; } if (pool == NULL) - Sys_Error("Mem_Alloc: pool == NULL (alloc at %s:%i)", filename, fileline); - if (developer.integer && developer_memory.integer) - Con_Printf("Mem_Alloc: pool %s, file %s:%i, size %i bytes\n", pool->name, filename, fileline, (int)size); - //if (developer.integer && developer_memorydebug.integer) + { + if(olddata) + pool = ((memheader_t *)((unsigned char *) olddata - sizeof(memheader_t)))->pool; + else + Sys_Error("Mem_Alloc: pool == NULL (alloc at %s:%i)", filename, fileline); + } + if (mem_mutex) + Thread_LockMutex(mem_mutex); + if (developer_memory.integer || size >= developer_memoryreportlargerthanmb.value * 1048576) + Con_DPrintf("Mem_Alloc: pool %s, file %s:%i, size %f bytes (%f MB)\n", pool->name, filename, fileline, (double)size, (double)size / 1048576.0f); + //if (developer.integer > 0 && developer_memorydebug.integer) // _Mem_CheckSentinelsGlobal(filename, fileline); pool->totalsize += size; realsize = alignment + sizeof(memheader_t) + size + sizeof(sentinel2); pool->realsize += realsize; base = (unsigned char *)Clump_AllocBlock(realsize); - if (base== NULL) + if (base == NULL) { Mem_PrintList(0); Mem_PrintStats(); Mem_PrintList(1<<30); Mem_PrintStats(); - Sys_Error("Mem_Alloc: out of memory (alloc at %s:%i)", filename, fileline); + Sys_Error("Mem_Alloc: out of memory (alloc of size %f (%.3fMB) at %s:%i)", (double)realsize, (double)realsize / (1 << 20), filename, fileline); } // calculate address that aligns the end of the memheader_t to the specified alignment mem = (memheader_t*)((((size_t)base + sizeof(memheader_t) + (alignment-1)) & ~(alignment-1)) - sizeof(memheader_t)); @@ -358,11 +423,10 @@ void *_Mem_Alloc(mempool_t *pool, void *olddata, size_t size, size_t alignment, memcpy((unsigned char *) mem + sizeof(memheader_t) + mem->size, &sentinel2, sizeof(sentinel2)); // append to head of list - mem->next = pool->chain; - mem->prev = NULL; - pool->chain = mem; - if (mem->next) - mem->next->prev = mem; + List_Add(&mem->list, &pool->chain); + + if (mem_mutex) + Thread_UnlockMutex(mem_mutex); // copy the shared portion in the case of a realloc, then memset the rest sharedsize = 0; @@ -392,28 +456,27 @@ static void _Mem_FreeBlock(memheader_t *mem, const char *filename, int fileline) sentinel1 = MEMHEADER_SENTINEL_FOR_ADDRESS(&mem->sentinel); sentinel2 = MEMHEADER_SENTINEL_FOR_ADDRESS((unsigned char *) mem + sizeof(memheader_t) + mem->size); if (mem->sentinel != sentinel1) - Sys_Error("Mem_Free: trashed header sentinel 1 (alloc at %s:%i, free at %s:%i)", mem->filename, mem->fileline, filename, fileline); + Sys_Error("Mem_Free: trashed head sentinel (alloc at %s:%i, free at %s:%i)", mem->filename, mem->fileline, filename, fileline); if (memcmp((unsigned char *) mem + sizeof(memheader_t) + mem->size, &sentinel2, sizeof(sentinel2))) - Sys_Error("Mem_Free: trashed header sentinel 2 (alloc at %s:%i, free at %s:%i)", mem->filename, mem->fileline, filename, fileline); + Sys_Error("Mem_Free: trashed tail sentinel (alloc at %s:%i, free at %s:%i)", mem->filename, mem->fileline, filename, fileline); pool = mem->pool; - if (developer.integer && developer_memory.integer) - Con_Printf("Mem_Free: pool %s, alloc %s:%i, free %s:%i, size %i bytes\n", pool->name, mem->filename, mem->fileline, filename, fileline, (int)(mem->size)); + if (developer_memory.integer) + Con_DPrintf("Mem_Free: pool %s, alloc %s:%i, free %s:%i, size %i bytes\n", pool->name, mem->filename, mem->fileline, filename, fileline, (int)(mem->size)); // unlink memheader from doubly linked list - if ((mem->prev ? mem->prev->next != mem : pool->chain != mem) || (mem->next && mem->next->prev != mem)) + if (mem->list.prev->next != &mem->list || mem->list.next->prev != &mem->list) Sys_Error("Mem_Free: not allocated or double freed (free at %s:%i)", filename, fileline); - if (mem->prev) - mem->prev->next = mem->next; - else - pool->chain = mem->next; - if (mem->next) - mem->next->prev = mem->prev; + if (mem_mutex) + Thread_LockMutex(mem_mutex); + List_Delete(&mem->list); // memheader has been unlinked, do the actual free now size = mem->size; realsize = sizeof(memheader_t) + size + sizeof(sentinel2); pool->totalsize -= size; pool->realsize -= realsize; Clump_FreeBlock(mem->baseaddress, realsize); + if (mem_mutex) + Thread_UnlockMutex(mem_mutex); } void _Mem_Free(void *data, const char *filename, int fileline) @@ -424,7 +487,7 @@ void _Mem_Free(void *data, const char *filename, int fileline) return; } - if (developer.integer && developer_memorydebug.integer) + if (developer_memorydebug.integer) { //_Mem_CheckSentinelsGlobal(filename, fileline); if (!Mem_IsAllocated(NULL, data)) @@ -437,8 +500,8 @@ void _Mem_Free(void *data, const char *filename, int fileline) mempool_t *_Mem_AllocPool(const char *name, int flags, mempool_t *parent, const char *filename, int fileline) { mempool_t *pool; - //if (developer.integer && developer_memorydebug.integer) - // _Mem_CheckSentinelsGlobal(filename, fileline); + if (developer_memorydebug.integer) + _Mem_CheckSentinelsGlobal(filename, fileline); pool = (mempool_t *)Clump_AllocBlock(sizeof(mempool_t)); if (pool == NULL) { @@ -454,7 +517,7 @@ mempool_t *_Mem_AllocPool(const char *name, int flags, mempool_t *parent, const pool->filename = filename; pool->fileline = fileline; pool->flags = flags; - pool->chain = NULL; + List_Create(&pool->chain); pool->totalsize = 0; pool->realsize = sizeof(mempool_t); strlcpy (pool->name, name, sizeof (pool->name)); @@ -469,8 +532,8 @@ void _Mem_FreePool(mempool_t **poolpointer, const char *filename, int fileline) mempool_t *pool = *poolpointer; mempool_t **chainaddress, *iter, *temp; - //if (developer.integer && developer_memorydebug.integer) - // _Mem_CheckSentinelsGlobal(filename, fileline); + if (developer_memorydebug.integer) + _Mem_CheckSentinelsGlobal(filename, fileline); if (pool) { // unlink pool from chain @@ -484,13 +547,15 @@ void _Mem_FreePool(mempool_t **poolpointer, const char *filename, int fileline) *chainaddress = pool->next; // free memory owned by the pool - while (pool->chain) - _Mem_FreeBlock(pool->chain, filename, fileline); + while (!List_Is_Empty(&pool->chain)) + _Mem_FreeBlock(List_First_Entry(&pool->chain, memheader_t, list), filename, fileline); // free child pools, too - for(iter = poolchain; iter; temp = iter = iter->next) + for(iter = poolchain; iter; iter = temp) { + temp = iter->next; if(iter->parent == pool) _Mem_FreePool(&temp, filename, fileline); + } // free the pool itself Clump_FreeBlock(pool, sizeof(*pool)); @@ -503,7 +568,7 @@ void _Mem_EmptyPool(mempool_t *pool, const char *filename, int fileline) { mempool_t *chainaddress; - if (developer.integer && developer_memorydebug.integer) + if (developer_memorydebug.integer) { //_Mem_CheckSentinelsGlobal(filename, fileline); // check if this pool is in the poolchain @@ -516,13 +581,13 @@ void _Mem_EmptyPool(mempool_t *pool, const char *filename, int fileline) if (pool == NULL) Sys_Error("Mem_EmptyPool: pool == NULL (emptypool at %s:%i)", filename, fileline); if (pool->sentinel1 != MEMHEADER_SENTINEL_FOR_ADDRESS(&pool->sentinel1)) - Sys_Error("Mem_EmptyPool: trashed pool sentinel 2 (allocpool at %s:%i, emptypool at %s:%i)", pool->filename, pool->fileline, filename, fileline); - if (pool->sentinel2 != MEMHEADER_SENTINEL_FOR_ADDRESS(&pool->sentinel2)) Sys_Error("Mem_EmptyPool: trashed pool sentinel 1 (allocpool at %s:%i, emptypool at %s:%i)", pool->filename, pool->fileline, filename, fileline); + if (pool->sentinel2 != MEMHEADER_SENTINEL_FOR_ADDRESS(&pool->sentinel2)) + Sys_Error("Mem_EmptyPool: trashed pool sentinel 2 (allocpool at %s:%i, emptypool at %s:%i)", pool->filename, pool->fileline, filename, fileline); // free memory owned by the pool - while (pool->chain) - _Mem_FreeBlock(pool->chain, filename, fileline); + while (!List_Is_Empty(&pool->chain)) + _Mem_FreeBlock(List_First_Entry(&pool->chain, memheader_t, list), filename, fileline); // empty child pools, too for(chainaddress = poolchain; chainaddress; chainaddress = chainaddress->next) @@ -544,9 +609,9 @@ void _Mem_CheckSentinels(void *data, const char *filename, int fileline) sentinel1 = MEMHEADER_SENTINEL_FOR_ADDRESS(&mem->sentinel); sentinel2 = MEMHEADER_SENTINEL_FOR_ADDRESS((unsigned char *) mem + sizeof(memheader_t) + mem->size); if (mem->sentinel != sentinel1) - Sys_Error("Mem_Free: trashed header sentinel 1 (alloc at %s:%i, sentinel check at %s:%i)", mem->filename, mem->fileline, filename, fileline); + Sys_Error("Mem_Free: trashed head sentinel (alloc at %s:%i, sentinel check at %s:%i)", mem->filename, mem->fileline, filename, fileline); if (memcmp((unsigned char *) mem + sizeof(memheader_t) + mem->size, &sentinel2, sizeof(sentinel2))) - Sys_Error("Mem_Free: trashed header sentinel 2 (alloc at %s:%i, sentinel check at %s:%i)", mem->filename, mem->fileline, filename, fileline); + Sys_Error("Mem_Free: trashed tail sentinel (alloc at %s:%i, sentinel check at %s:%i)", mem->filename, mem->fileline, filename, fileline); } #if MEMCLUMPING @@ -575,7 +640,7 @@ void _Mem_CheckSentinelsGlobal(const char *filename, int fileline) Sys_Error("Mem_CheckSentinelsGlobal: trashed pool sentinel 2 (allocpool at %s:%i, sentinel check at %s:%i)", pool->filename, pool->fileline, filename, fileline); } for (pool = poolchain;pool;pool = pool->next) - for (mem = pool->chain;mem;mem = mem->next) + List_For_Each_Entry(mem, &pool->chain, memheader_t, list) _Mem_CheckSentinels((void *)((unsigned char *) mem + sizeof(memheader_t)), filename, fileline); #if MEMCLUMPING for (pool = poolchain;pool;pool = pool->next) @@ -584,7 +649,7 @@ void _Mem_CheckSentinelsGlobal(const char *filename, int fileline) #endif } -qboolean Mem_IsAllocated(mempool_t *pool, void *data) +qbool Mem_IsAllocated(mempool_t *pool, void *data) { memheader_t *header; memheader_t *target; @@ -593,7 +658,7 @@ qboolean Mem_IsAllocated(mempool_t *pool, void *data) { // search only one pool target = (memheader_t *)((unsigned char *) data - sizeof(memheader_t)); - for( header = pool->chain ; header ; header = header->next ) + List_For_Each_Entry(header, &pool->chain, memheader_t, list) if( header == target ) return true; } @@ -685,9 +750,9 @@ void Mem_ExpandableArray_FreeRecord(memexpandablearray_t *l, void *record) // co { j = (p - l->arrays[i].data) / l->recordsize; if (p != l->arrays[i].data + j * l->recordsize) - Sys_Error("Mem_ExpandableArray_FreeRecord: no such record %p\n", p); + Sys_Error("Mem_ExpandableArray_FreeRecord: no such record %p\n", (void *)p); if (!l->arrays[i].allocflags[j]) - Sys_Error("Mem_ExpandableArray_FreeRecord: record %p is already free!\n", p); + Sys_Error("Mem_ExpandableArray_FreeRecord: record %p is already free!\n", (void *)p); l->arrays[i].allocflags[j] = false; l->arrays[i].numflaggedrecords--; return; @@ -746,10 +811,10 @@ void Mem_PrintStats(void) Con_Printf("total allocated size: %lu bytes (%.3fMB)\n", (unsigned long)realsize, realsize / 1048576.0); for (pool = poolchain;pool;pool = pool->next) { - if ((pool->flags & POOLFLAG_TEMP) && pool->chain) + if ((pool->flags & POOLFLAG_TEMP) && !List_Is_Empty(&pool->chain)) { Con_Printf("Memory pool %p has sprung a leak totalling %lu bytes (%.3fMB)! Listing contents...\n", (void *)pool, (unsigned long)pool->totalsize, pool->totalsize / 1048576.0); - for (mem = pool->chain;mem;mem = mem->next) + List_For_Each_Entry(mem, &pool->chain, memheader_t, list) Con_Printf("%10lu bytes allocated at %s:%i\n", (unsigned long)mem->size, mem->filename, mem->fileline); } } @@ -766,22 +831,22 @@ void Mem_PrintList(size_t minallocationsize) { Con_Printf("%10luk (%10luk actual) %s (%+li byte change) %s\n", (unsigned long) ((pool->totalsize + 1023) / 1024), (unsigned long)((pool->realsize + 1023) / 1024), pool->name, (long)(pool->totalsize - pool->lastchecksize), (pool->flags & POOLFLAG_TEMP) ? "TEMP" : ""); pool->lastchecksize = pool->totalsize; - for (mem = pool->chain;mem;mem = mem->next) + List_For_Each_Entry(mem, &pool->chain, memheader_t, list) if (mem->size >= minallocationsize) Con_Printf("%10lu bytes allocated at %s:%i\n", (unsigned long)mem->size, mem->filename, mem->fileline); } } -void MemList_f(void) +static void MemList_f(cmd_state_t *cmd) { - switch(Cmd_Argc()) + switch(Cmd_Argc(cmd)) { case 1: Mem_PrintList(1<<30); Mem_PrintStats(); break; case 2: - Mem_PrintList(atoi(Cmd_Argv(1)) * 1024); + Mem_PrintList(atoi(Cmd_Argv(cmd, 1)) * 1024); Mem_PrintStats(); break; default: @@ -790,22 +855,21 @@ void MemList_f(void) } } -extern void R_TextureStats_Print(qboolean printeach, qboolean printpool, qboolean printtotal); -void MemStats_f(void) +static void MemStats_f(cmd_state_t *cmd) { Mem_CheckSentinelsGlobal(); - R_TextureStats_Print(false, false, true); - GL_Mesh_ListVBOs(false); Mem_PrintStats(); } -char* Mem_strdup (mempool_t *pool, const char* s) +char* _Mem_strdup (mempool_t *pool, const char* s, const char *filename, int fileline) { char* p; - size_t sz = strlen (s) + 1; - if (s == NULL) return NULL; - p = (char*)Mem_Alloc (pool, sz); + size_t sz; + if (s == NULL) + return NULL; + sz = strlen (s) + 1; + p = (char*)_Mem_Alloc (pool, NULL, sz, 16, filename, fileline); strlcpy (p, s, sz); return p; } @@ -819,25 +883,97 @@ void Memory_Init (void) { static union {unsigned short s;unsigned char b[2];} u; u.s = 0x100; - mem_bigendian = u.b[0]; + mem_bigendian = u.b[0] != 0; sentinel_seed = rand(); poolchain = NULL; tempmempool = Mem_AllocPool("Temporary Memory", POOLFLAG_TEMP, NULL); zonemempool = Mem_AllocPool("Zone", 0, NULL); + + if (Thread_HasThreads()) + mem_mutex = Thread_CreateMutex(); } void Memory_Shutdown (void) { // Mem_FreePool (&zonemempool); // Mem_FreePool (&tempmempool); + + if (mem_mutex) + Thread_DestroyMutex(mem_mutex); + mem_mutex = NULL; } void Memory_Init_Commands (void) { - Cmd_AddCommand ("memstats", MemStats_f, "prints memory system statistics"); - Cmd_AddCommand ("memlist", MemList_f, "prints memory pool information (or if used as memlist 5 lists individual allocations of 5K or larger, 0 lists all allocations)"); + Cmd_AddCommand(CF_SHARED, "memstats", MemStats_f, "prints memory system statistics"); + Cmd_AddCommand(CF_SHARED, "memlist", MemList_f, "prints memory pool information (or if used as memlist 5 lists individual allocations of 5K or larger, 0 lists all allocations)"); + Cvar_RegisterVariable (&developer_memory); Cvar_RegisterVariable (&developer_memorydebug); + Cvar_RegisterVariable (&developer_memoryreportlargerthanmb); + Cvar_RegisterVariable (&sys_memsize_physical); + Cvar_RegisterVariable (&sys_memsize_virtual); + +#if defined(WIN32) +#ifdef _WIN64 + { + MEMORYSTATUSEX status; + // first guess + Cvar_SetValueQuick(&sys_memsize_virtual, 8388608); + // then improve + status.dwLength = sizeof(status); + if(GlobalMemoryStatusEx(&status)) + { + Cvar_SetValueQuick(&sys_memsize_physical, status.ullTotalPhys / 1048576.0); + Cvar_SetValueQuick(&sys_memsize_virtual, min(sys_memsize_virtual.value, status.ullTotalVirtual / 1048576.0)); + } + } +#else + { + MEMORYSTATUS status; + // first guess + Cvar_SetValueQuick(&sys_memsize_virtual, 2048); + // then improve + status.dwLength = sizeof(status); + GlobalMemoryStatus(&status); + Cvar_SetValueQuick(&sys_memsize_physical, status.dwTotalPhys / 1048576.0); + Cvar_SetValueQuick(&sys_memsize_virtual, min(sys_memsize_virtual.value, status.dwTotalVirtual / 1048576.0)); + } +#endif +#else + { + // first guess + Cvar_SetValueQuick(&sys_memsize_virtual, (sizeof(void*) == 4) ? 2048 : 268435456); + // then improve + { + // Linux, and BSD with linprocfs mounted + FILE *f = fopen("/proc/meminfo", "r"); + if(f) + { + static char buf[1024]; + while(fgets(buf, sizeof(buf), f)) + { + const char *p = buf; + if(!COM_ParseToken_Console(&p)) + continue; + if(!strcmp(com_token, "MemTotal:")) + { + if(!COM_ParseToken_Console(&p)) + continue; + Cvar_SetValueQuick(&sys_memsize_physical, atof(com_token) / 1024.0); + } + if(!strcmp(com_token, "SwapTotal:")) + { + if(!COM_ParseToken_Console(&p)) + continue; + Cvar_SetValueQuick(&sys_memsize_virtual, min(sys_memsize_virtual.value , atof(com_token) / 1024.0 + sys_memsize_physical.value)); + } + } + fclose(f); + } + } + } +#endif }