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commit 2level page-map on over-commit systems

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This commit is contained in:
daanx 2024-12-23 09:53:52 -08:00
parent bc5ae31649
commit 657135de36
4 changed files with 26 additions and 23 deletions
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2
src/options.c
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@ -103,7 +103,7 @@ typedef struct mi_option_desc_s {
#endif
#ifndef MI_DEFAULT_PAGEMAP_COMMIT
#if defined(__APPLE__)
#if defined(__APPLE__) // when overloading malloc, we still get mixed pointers sometimes on macOS; this avoids a bad access
#define MI_DEFAULT_PAGEMAP_COMMIT 1
#else
#define MI_DEFAULT_PAGEMAP_COMMIT 0

3
src/page-map.c
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@ -187,7 +187,8 @@ bool _mi_page_map_init(void) {
const size_t os_page_size = _mi_os_page_size();
const size_t page_map_size = _mi_align_up( page_map_count * sizeof(mi_page_t**), os_page_size);
const size_t reserve_size = page_map_size + os_page_size;
const bool commit = page_map_size <= 64*MI_KiB || mi_option_is_enabled(mi_option_pagemap_commit); // _mi_os_has_overcommit(); // commit on-access on Linux systems?
const bool commit = page_map_size <= 64*MI_KiB ||
mi_option_is_enabled(mi_option_pagemap_commit) || _mi_os_has_overcommit();
_mi_page_map = (mi_page_t***)_mi_os_alloc_aligned(reserve_size, 1, commit, true /* allow large */, &mi_page_map_memid);
if (_mi_page_map==NULL) {
_mi_error_message(ENOMEM, "unable to reserve virtual memory for the page map (%zu KiB)\n", page_map_size / MI_KiB);