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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
+23 -22
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@@ -9,24 +9,25 @@
internal Arena *
arena_alloc_(ArenaParams *params)
{
// rjf: round up reserve/commit sizes
U64 reserve_size = params->reserve_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);
}
U64 commit_size = params->commit_size;
// rjf: reserve/commit initial block
void *base = params->optional_backing_buffer;
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)
{
base = os_reserve_large(reserve_size);
@@ -56,18 +57,18 @@ arena_alloc_(ArenaParams *params)
// rjf: extract arena header & fill
AsanUnpoisonMemoryRegion(base, ARENA_HEADER_SIZE);
Arena *arena = (Arena *)base;
arena->current = arena;
arena->flags = params->flags;
arena->cmt_size = params->commit_size;
arena->res_size = params->reserve_size;
arena->base_pos = 0;
arena->pos = ARENA_HEADER_SIZE;
arena->cmt = commit_size;
arena->res = reserve_size;
Arena *arena = base;
arena->current = arena;
arena->flags = params->flags;
arena->cmt_size = params->commit_size;
arena->res_size = params->reserve_size;
arena->base_pos = 0;
arena->pos = ARENA_HEADER_SIZE;
arena->cmt = commit_size;
arena->res = reserve_size;
arena->allocation_site_file = params->allocation_site_file;
arena->allocation_site_line = params->allocation_site_line;
arena->name = params->name;
arena->name = params->name;
#if ARENA_FREE_LIST
arena->free_last = 0;
#endif