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use sysinfo call on linux to determine physical memory (as _SC_PHYSPAGES may cause allocation) (issue #1100)

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daanx 2025-06-10 11:28:03 -07:00
parent 53f88dce76
commit c9541ac6e8
1 changed files with 16 additions and 8 deletions
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14
src/prim/unix/prim.c
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@ -32,6 +32,7 @@ terms of the MIT license. A copy of the license can be found in the file
#if defined(__linux__)
#include <features.h>
#include <sys/prctl.h> // THP disable, PR_SET_VMA
#include <sys/sysinfo.h> // sysinfo
#if defined(__GLIBC__) && !defined(PR_SET_VMA)
#include <linux/prctl.h>
#endif
@ -156,16 +157,23 @@ static void unix_detect_physical_memory( size_t page_size, size_t* physical_memo
int mib[2] = { CTL_HW, HW_MEMSIZE };
#endif
const int err = sysctl(mib, 2, &physical_memory, &length, NULL, 0);
if (err == 0 && physical_memory > 0) {
if (err==0 && physical_memory > 0) {
const int64_t phys_in_kib = physical_memory / MI_KiB;
if (phys_in_kib > 0 && (uint64_t)phys_in_kib <= SIZE_MAX) {
*physical_memory_in_kib = (size_t)phys_in_kib;
}
}
#elif defined(_SC_PHYS_PAGES) // linux
#elif defined(__linux__)
MI_UNUSED(page_size);
struct sysinfo info; _mi_memzero_var(info);
const int err = sysinfo(&info);
if (err==0 && info.totalram > 0 && info.totalram <= SIZE_MAX) {
*physical_memory_in_kib = (size_t)info.totalram / MI_KiB;
}
#elif defined(_SC_PHYS_PAGES) // do not use by default as it might cause allocation (by using `fopen` to parse /proc/meminfo) (issue #1100)
const long pphys = sysconf(_SC_PHYS_PAGES);
const size_t psize_in_kib = page_size / MI_KiB;
if (psize_in_kib > 0 && pphys > 0 && (unsigned long)pphys < SIZE_MAX && (size_t)pphys <= (SIZE_MAX/psize_in_kib)) {
if (psize_in_kib > 0 && pphys > 0 && (unsigned long)pphys <= SIZE_MAX && (size_t)pphys <= (SIZE_MAX/psize_in_kib)) {
*physical_memory_in_kib = (size_t)pphys * psize_in_kib;
}
#endif