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do not round up commit and reserve sizes on optional buffers

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This commit is contained in:
Nikita Smith
2026-04-06 12:04:32 -07:00
parent e0c6df710f
commit 12a1e28fff
1 changed files with 25 additions and 24 deletions
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src/base/base_arena.c
+25 -24
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@@ -8,25 +8,26 @@
internal Arena * internal Arena *
arena_alloc_(ArenaParams *params) arena_alloc_(ArenaParams *params)
{ {
// rjf: round up reserve/commit sizes
U64 reserve_size = params->reserve_size; U64 reserve_size = params->reserve_size;
U64 commit_size = params->commit_size; U64 commit_size = params->commit_size;
if(params->flags & ArenaFlag_LargePages)
{
reserve_size = AlignPow2(reserve_size, os_get_system_info()->large_page_size);
commit_size = AlignPow2(commit_size, os_get_system_info()->large_page_size);
}
else
{
reserve_size = AlignPow2(reserve_size, os_get_system_info()->page_size);
commit_size = AlignPow2(commit_size, os_get_system_info()->page_size);
}
// rjf: reserve/commit initial block // rjf: reserve/commit initial block
void *base = params->optional_backing_buffer; void *base = params->optional_backing_buffer;
if(base == 0) if(base == 0)
{ {
// rjf: round up reserve/commit sizes
if(params->flags & ArenaFlag_LargePages)
{
reserve_size = AlignPow2(reserve_size, os_get_system_info()->large_page_size);
commit_size = AlignPow2(commit_size, os_get_system_info()->large_page_size);
}
else
{
reserve_size = AlignPow2(reserve_size, os_get_system_info()->page_size);
commit_size = AlignPow2(commit_size, os_get_system_info()->page_size);
}
if(params->flags & ArenaFlag_LargePages) if(params->flags & ArenaFlag_LargePages)
{ {
base = os_reserve_large(reserve_size); base = os_reserve_large(reserve_size);
@@ -56,18 +57,18 @@ arena_alloc_(ArenaParams *params)
// rjf: extract arena header & fill // rjf: extract arena header & fill
AsanUnpoisonMemoryRegion(base, ARENA_HEADER_SIZE); AsanUnpoisonMemoryRegion(base, ARENA_HEADER_SIZE);
Arena *arena = (Arena *)base; Arena *arena = base;
arena->current = arena; arena->current = arena;
arena->flags = params->flags; arena->flags = params->flags;
arena->cmt_size = params->commit_size; arena->cmt_size = params->commit_size;
arena->res_size = params->reserve_size; arena->res_size = params->reserve_size;
arena->base_pos = 0; arena->base_pos = 0;
arena->pos = ARENA_HEADER_SIZE; arena->pos = ARENA_HEADER_SIZE;
arena->cmt = commit_size; arena->cmt = commit_size;
arena->res = reserve_size; arena->res = reserve_size;
arena->allocation_site_file = params->allocation_site_file; arena->allocation_site_file = params->allocation_site_file;
arena->allocation_site_line = params->allocation_site_line; arena->allocation_site_line = params->allocation_site_line;
arena->name = params->name; arena->name = params->name;
#if ARENA_FREE_LIST #if ARENA_FREE_LIST
arena->free_last = 0; arena->free_last = 0;
#endif #endif