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Reduce stack virtual memory consumption on Linux

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Justine Tunney 2024-12-25 19:43:43 -08:00
parent cc8a9eb93c
commit 36e5861b0c
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31 changed files with 583 additions and 166 deletions
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libc/intrin/rlimitstack.c Normal file
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/*-*- mode:c;indent-tabs-mode:nil;c-basic-offset:2;tab-width:8;coding:utf-8 -*-│
│ vi: set et ft=c ts=2 sts=2 sw=2 fenc=utf-8 :vi │
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2024 Justine Alexandra Roberts Tunney │
│ │
│ Permission to use, copy, modify, and/or distribute this software for │
│ any purpose with or without fee is hereby granted, provided that the │
│ above copyright notice and this permission notice appear in all copies. │
│ │
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
│ PERFORMANCE OF THIS SOFTWARE. │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/atomic.h"
#include "libc/calls/struct/rlimit.h"
#include "libc/calls/struct/rlimit.internal.h"
#include "libc/cosmo.h"
#include "libc/dce.h"
#include "libc/intrin/cxaatexit.h"
#include "libc/intrin/lockless.h"
#include "libc/intrin/rlimit.h"
#include "libc/runtime/stack.h"
#include "libc/sysv/consts/rlim.h"
#include "libc/sysv/consts/rlimit.h"
struct atomic_rlimit {
atomic_ulong cur;
atomic_ulong max;
atomic_uint once;
atomic_uint gen;
};
static struct atomic_rlimit __rlimit_stack;
static void __rlimit_stack_init(void) {
struct rlimit rlim;
if (IsWindows()) {
rlim.rlim_cur = GetStaticStackSize();
rlim.rlim_max = -1; // RLIM_INFINITY in consts.sh
} else {
sys_getrlimit(RLIMIT_STACK, &rlim);
}
atomic_init(&__rlimit_stack.cur, rlim.rlim_cur);
atomic_init(&__rlimit_stack.max, rlim.rlim_max);
}
struct rlimit __rlimit_stack_get(void) {
unsigned gen;
unsigned long cur, max;
cosmo_once(&__rlimit_stack.once, __rlimit_stack_init);
gen = lockless_read_begin(&__rlimit_stack.gen);
do {
cur = atomic_load_explicit(&__rlimit_stack.cur, memory_order_acquire);
max = atomic_load_explicit(&__rlimit_stack.max, memory_order_acquire);
} while (!lockless_read_end(&__rlimit_stack.gen, &gen));
return (struct rlimit){cur, max};
}
void __rlimit_stack_set(struct rlimit rlim) {
unsigned gen;
unsigned long cur, max;
cosmo_once(&__rlimit_stack.once, __rlimit_stack_init);
__cxa_lock();
cur = rlim.rlim_cur;
max = rlim.rlim_max;
gen = lockless_write_begin(&__rlimit_stack.gen);
atomic_store_explicit(&__rlimit_stack.cur, cur, memory_order_release);
atomic_store_explicit(&__rlimit_stack.max, max, memory_order_release);
lockless_write_end(&__rlimit_stack.gen, gen);
__cxa_unlock();
}