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Reduce stack virtual memory consumption on Linux

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This commit is contained in:
Justine Tunney 2024-12-25 19:43:43 -08:00
parent cc8a9eb93c
commit 36e5861b0c
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GPG key ID: BE714B4575D6E328
31 changed files with 583 additions and 166 deletions
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16
libc/intrin/getmainstack.c
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@ -17,16 +17,13 @@
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/calls/struct/rlimit.h"
#include "libc/calls/struct/rlimit.internal.h"
#include "libc/dce.h"
#include "libc/intrin/getauxval.h"
#include "libc/intrin/kprintf.h"
#include "libc/intrin/maps.h"
#include "libc/intrin/rlimit.h"
#include "libc/macros.h"
#include "libc/runtime/runtime.h"
#include "libc/stdio/sysparam.h"
#include "libc/sysv/consts/auxv.h"
#include "libc/sysv/consts/rlim.h"
#include "libc/sysv/consts/rlimit.h"
// Hack for guessing boundaries of _start()'s stack
//
@ -91,12 +88,9 @@ static uintptr_t __get_main_top(int pagesz) {
}
static size_t __get_stack_size(int pagesz, uintptr_t start, uintptr_t top) {
size_t size, max = 8 * 1024 * 1024;
struct rlimit rlim = {RLIM_INFINITY};
sys_getrlimit(RLIMIT_STACK, &rlim);
if ((size = rlim.rlim_cur) > max)
size = max;
return MAX(ROUNDUP(size, pagesz), ROUNDUP(top - start, pagesz));
size_t stacksz = __rlimit_stack_get().rlim_cur;
stacksz = MIN(stacksz, 1024ul * 1024 * 1024 * 1024);
return MAX(ROUNDDOWN(stacksz, pagesz), ROUNDUP(top - start, pagesz));
}
/**