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add unix large page size constant and adjust aligment to the large page size for large allocations

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daanx 2025-05-02 16:27:00 -07:00
parent f3e92b1edd
commit 417e8176bd
1 changed files with 6 additions and 2 deletions
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8
src/prim/unix/prim.c
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@ -70,6 +70,7 @@ terms of the MIT license. A copy of the license can be found in the file
#define MADV_FREE POSIX_MADV_FREE
#endif
#define MI_UNIX_LARGE_PAGE_SIZE (2*MI_MiB) // TODO: can we query the OS for this?
//------------------------------------------------------------------------------------
// Use syscalls for some primitives to allow for libraries that override open/read/close etc.
@ -156,7 +157,7 @@ void _mi_prim_mem_init( mi_os_mem_config_t* config )
}
#endif
}
config->large_page_size = 2*MI_MiB; // TODO: can we query the OS for this?
config->large_page_size = MI_UNIX_LARGE_PAGE_SIZE;
config->has_overcommit = unix_detect_overcommit();
config->has_partial_free = true; // mmap can free in parts
config->has_virtual_reserve = true; // todo: check if this true for NetBSD? (for anonymous mmap with PROT_NONE)
@ -386,6 +387,9 @@ int _mi_prim_alloc(void* hint_addr, size_t size, size_t try_alignment, bool comm
mi_assert_internal(size > 0 && (size % _mi_os_page_size()) == 0);
mi_assert_internal(commit || !allow_large);
mi_assert_internal(try_alignment > 0);
if (hint_addr == NULL && size >= 8*MI_UNIX_LARGE_PAGE_SIZE && try_alignment > 1 && _mi_is_power_of_two(try_alignment) && try_alignment < MI_UNIX_LARGE_PAGE_SIZE) {
try_alignment = MI_UNIX_LARGE_PAGE_SIZE; // try to align along large page size for larger allocations
}
*is_zero = true;
int protect_flags = (commit ? (PROT_WRITE | PROT_READ) : PROT_NONE);
@ -433,7 +437,7 @@ int _mi_prim_decommit(void* start, size_t size, bool* needs_recommit) {
int err = 0;
// decommit: use MADV_DONTNEED as it decreases rss immediately (unlike MADV_FREE)
err = unix_madvise(start, size, MADV_DONTNEED);
#if !MI_DEBUG && !MI_SECURE
#if !MI_DEBUG && MI_SECURE<=2
*needs_recommit = false;
#else
*needs_recommit = true;