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temp arena change that lets us bypass memory decommits

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This commit is contained in:
Nikita Smith
2024-10-15 14:43:30 -07:00
parent 65b5176468
commit 7e98df22d7
2 changed files with 62 additions and 11 deletions
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src/base/base_arena.c
+53 -10
View File
@@ -58,6 +58,10 @@ arena_alloc_(ArenaParams *params)
arena->pos = ARENA_HEADER_SIZE;
arena->cmt = commit_size;
arena->res = reserve_size;
#if ARENA_FREE_LIST
arena->free_size = 0;
arena->free_last = 0;
#endif
AsanPoisonMemoryRegion(base, commit_size);
AsanUnpoisonMemoryRegion(base, ARENA_HEADER_SIZE);
return arena;
@@ -85,18 +89,45 @@ arena_push(Arena *arena, U64 size, U64 align)
// rjf: chain, if needed
if(current->res < pos_pst && !(arena->flags & ArenaFlag_NoChain))
{
U64 res_size = current->res_size;
U64 cmt_size = current->cmt_size;
if(size + ARENA_HEADER_SIZE > res_size)
Arena *new_block = 0;
#if ARENA_FREE_LIST
Arena *prev_block;
for(new_block = arena->free_last, prev_block = 0; new_block != 0; prev_block = new_block, new_block = new_block->prev)
{
res_size = size + ARENA_HEADER_SIZE;
cmt_size = size + ARENA_HEADER_SIZE;
if(new_block->res >= AlignPow2(size, align))
{
if(prev_block)
{
prev_block->prev = new_block->prev;
}
else
{
arena->free_last = new_block->prev;
}
arena->free_size -= new_block->res_size;
AsanUnpoisonMemoryRegion((U8*)new_block + ARENA_HEADER_SIZE, new_block->res_size - ARENA_HEADER_SIZE);
break;
}
}
Arena *new_block = arena_alloc(.reserve_size = res_size,
.commit_size = cmt_size,
.flags = current->flags);
new_block->base_pos = current->base_pos + current->res;
SLLStackPush_N(arena->current, new_block, prev);
#endif
if(new_block == 0)
{
U64 res_size = current->res_size;
U64 cmt_size = current->cmt_size;
if(size + ARENA_HEADER_SIZE > res_size)
{
res_size = size + ARENA_HEADER_SIZE;
cmt_size = size + ARENA_HEADER_SIZE;
}
new_block = arena_alloc(.reserve_size = res_size,
.commit_size = cmt_size,
.flags = current->flags);
new_block->base_pos = current->base_pos + current->res;
SLLStackPush_N(arena->current, new_block, prev);
}
current = new_block;
pos_pre = AlignPow2(current->pos, align);
pos_pst = pos_pre + size;
@@ -155,11 +186,23 @@ arena_pop_to(Arena *arena, U64 pos)
{
U64 big_pos = ClampBot(ARENA_HEADER_SIZE, pos);
Arena *current = arena->current;
#if ARENA_FREE_LIST
for(Arena *prev = 0; current->base_pos >= big_pos; current = prev)
{
prev = current->prev;
current->pos = ARENA_HEADER_SIZE;
arena->free_size += current->res_size;
SLLStackPush_N(arena->free_last, current, prev);
AsanPoisonMemoryRegion((U8*)current + ARENA_HEADER_SIZE, current->res_size - ARENA_HEADER_SIZE);
}
#else
for(Arena *prev = 0; current->base_pos >= big_pos; current = prev)
{
prev = current->prev;
os_release(current, current->res);
}
#endif
arena->current = current;
U64 new_pos = big_pos - current->base_pos;
AssertAlways(new_pos <= current->pos);
src/base/base_arena.h
+9 -1
View File
@@ -7,7 +7,11 @@
////////////////////////////////
//~ rjf: Constants
#define ARENA_HEADER_SIZE 64
#if ARENA_FREE_LIST
# define ARENA_HEADER_SIZE 128
#else
# define ARENA_HEADER_SIZE 64
#endif
////////////////////////////////
//~ rjf: Types
@@ -40,6 +44,10 @@ struct Arena
U64 pos;
U64 cmt;
U64 res;
#if ARENA_FREE_LIST
U64 free_size;
Arena *free_last;
#endif
};
StaticAssert(sizeof(Arena) <= ARENA_HEADER_SIZE, arena_header_size_check);