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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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2
examples/greenbean.c
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@ -337,7 +337,7 @@ int main(int argc, char *argv[]) {
sigaddset(&block, SIGQUIT);
pthread_attr_t attr;
unassert(!pthread_attr_init(&attr));
unassert(!pthread_attr_setstacksize(&attr, 65536));
unassert(!pthread_attr_setstacksize(&attr, 65536 - getpagesize()));
unassert(!pthread_attr_setguardsize(&attr, getpagesize()));
unassert(!pthread_attr_setsigmask_np(&attr, &block));
unassert(!pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, 0));

20
examples/stackexplorer.c
View file

@ -7,9 +7,13 @@
│ • http://creativecommons.org/publicdomain/zero/1.0/ │
╚─────────────────────────────────────────────────────────────────*/
#endif
#include "libc/dce.h"
#include "libc/intrin/maps.h"
#include "libc/mem/alg.h"
#include "libc/mem/mem.h"
#include "libc/runtime/runtime.h"
#include "libc/runtime/stack.h"
#include "libc/runtime/winargs.internal.h"
#include "libc/stdio/stdio.h"
#include "libc/x/xasprintf.h"
@ -67,8 +71,18 @@ int main(int argc, char *argv[]) {
Append((uintptr_t)&__auxv[i + 1],
xasprintf("&auxv[%d] = %#lx", i + 1, __auxv[i + 1]));
}
qsort(things.p, things.n, sizeof(*things.p), Compare);
for (int i = 0; i < things.n; ++i) {
printf("%012lx %s\n", things.p[i].i, things.p[i].s);
if (!IsWindows()) {
struct AddrSize stak = __get_main_stack();
Append((intptr_t)stak.addr + stak.size, "top of stack");
Append((intptr_t)stak.addr, "bottom of stack");
} else {
#ifdef __x86_64__
Append(GetStaticStackAddr(0) + GetStaticStackSize(), "top of stack");
Append(GetStaticStackAddr(0) + GetGuardSize(), "bottom of stack");
Append(GetStaticStackAddr(0), "bottom of guard region");
#endif
}
qsort(things.p, things.n, sizeof(*things.p), Compare);
for (int i = 0; i < things.n; ++i)
printf("%012lx %s\n", things.p[i].i, things.p[i].s);
}

17
examples/thread.c Normal file
View file

@ -0,0 +1,17 @@
#include <pthread.h>
#include <stdio.h>
// how to spawn a thread
void *my_thread(void *arg) {
printf("my_thread(%p) is running\n", arg);
return (void *)0x456L;
}
int main(int argc, char *argv[]) {
void *res;
pthread_t th;
pthread_create(&th, 0, my_thread, (void *)0x123L);
pthread_join(th, &res);
printf("my_thread() returned %p\n", res);
}