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San: Bump alloc frequently reused guarded allocations

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To utilize a separate retained area for guarded extents, use bump alloc
to allocate those extents.
This commit is contained in:
Alex Lapenkou
2021-10-28 12:08:10 -07:00
committed by Alexander Lapenkov
parent f56f5b9930
commit 800ce49c19
10 changed files with 106 additions and 56 deletions
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src/arena.c
+4 -3
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@@ -328,8 +328,8 @@ arena_extent_alloc_large(tsdn_t *tsdn, arena_t *arena, size_t usize,
szind_t szind = sz_size2index(usize);
size_t esize = usize + sz_large_pad;
bool guarded = san_large_extent_decide_guard(tsdn, arena_get_ehooks(arena),
esize, alignment);
bool guarded = san_large_extent_decide_guard(tsdn,
arena_get_ehooks(arena), esize, alignment);
edata_t *edata = pa_alloc(tsdn, &arena->pa_shard, esize, alignment,
/* slab */ false, szind, zero, guarded, &deferred_work_generated);
assert(deferred_work_generated == false);
@@ -829,7 +829,8 @@ arena_slab_alloc(tsdn_t *tsdn, arena_t *arena, szind_t binind, unsigned binshard
witness_assert_depth_to_rank(tsdn_witness_tsdp_get(tsdn),
WITNESS_RANK_CORE, 0);
bool guarded = san_slab_extent_decide_guard(tsdn, arena_get_ehooks(arena));
bool guarded = san_slab_extent_decide_guard(tsdn,
arena_get_ehooks(arena));
edata_t *slab = pa_alloc(tsdn, &arena->pa_shard, bin_info->slab_size,
/* alignment */ PAGE, /* slab */ true, /* szind */ binind,
/* zero */ false, guarded, &deferred_work_generated);