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wip: purgeable arenas, various fixes

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This commit is contained in:
daanx 2023-04-03 17:58:28 -07:00
parent a9f42376b7
commit d22a13c990
5 changed files with 18 additions and 26 deletions
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16
src/prim/unix/prim.c
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@ -342,22 +342,6 @@ static void unix_mprotect_hint(int err) {
int _mi_prim_commit(void* start, size_t size, bool commit) {
/*
#if 0 && defined(MAP_FIXED) && !defined(__APPLE__)
// Linux: disabled for now as mmap fixed seems much more expensive than MADV_DONTNEED (and splits VMA's?)
if (commit) {
// commit: just change the protection
err = mprotect(start, csize, (PROT_READ | PROT_WRITE));
if (err != 0) { err = errno; }
}
else {
// decommit: use mmap with MAP_FIXED to discard the existing memory (and reduce rss)
const int fd = mi_unix_mmap_fd();
void* p = mmap(start, csize, PROT_NONE, (MAP_FIXED | MAP_PRIVATE | MAP_ANONYMOUS | MAP_NORESERVE), fd, 0);
if (p != start) { err = errno; }
}
#else
*/
int err = 0;
if (commit) {
// commit: ensure we can access the area