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getMemorySize() moved into zmalloc.c with other low level mem utils.

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See issue #2218.
This commit is contained in:
antirez
2014-12-17 17:11:20 +01:00
parent e1e41f691f
commit 615f6923d5
3 changed files with 51 additions and 50 deletions
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49
src/zmalloc.c
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@ -364,3 +364,52 @@ size_t zmalloc_get_smap_bytes_by_field(char *field) {
size_t zmalloc_get_private_dirty(void) {
return zmalloc_get_smap_bytes_by_field("Private_Dirty:");
}
/* Returns the size of physical memory (RAM) in bytes.
* It looks ugly, but this is the cleanest way to achive cross platform results.
* Cleaned up from:
* http://nadeausoftware.com/articles/2012/09/c_c_tip_how_get_physical_memory_size_system
*/
size_t zmalloc_get_memory_size(void) {
#if defined(__unix__) || defined(__unix) || defined(unix) || \
(defined(__APPLE__) && defined(__MACH__))
#if defined(CTL_HW) && (defined(HW_MEMSIZE) || defined(HW_PHYSMEM64))
int mib[2];
mib[0] = CTL_HW;
#if defined(HW_MEMSIZE)
mib[1] = HW_MEMSIZE; /* OSX. --------------------- */
#elif defined(HW_PHYSMEM64)
mib[1] = HW_PHYSMEM64; /* NetBSD, OpenBSD. --------- */
#endif
int64_t size = 0; /* 64-bit */
size_t len = sizeof(size);
if (sysctl( mib, 2, &size, &len, NULL, 0) == 0)
return (size_t)size;
return 0L; /* Failed? */
#elif defined(_SC_PHYS_PAGES) && defined(_SC_PAGESIZE)
/* FreeBSD, Linux, OpenBSD, and Solaris. -------------------- */
return (size_t)sysconf(_SC_PHYS_PAGES) * (size_t)sysconf(_SC_PAGESIZE);
#elif defined(CTL_HW) && (defined(HW_PHYSMEM) || defined(HW_REALMEM))
/* DragonFly BSD, FreeBSD, NetBSD, OpenBSD, and OSX. -------- */
int mib[2];
mib[0] = CTL_HW;
#if defined(HW_REALMEM)
mib[1] = HW_REALMEM; /* FreeBSD. ----------------- */
#elif defined(HW_PYSMEM)
mib[1] = HW_PHYSMEM; /* Others. ------------------ */
#endif
unsigned int size = 0; /* 32-bit */
size_t len = sizeof(size);
if (sysctl(mib, 2, &size, &len, NULL, 0) == 0)
return (size_t)size;
return 0L; /* Failed? */
#endif /* sysctl and sysconf variants */
#else
return 0L; /* Unknown OS. */
#endif
}