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San: Implement bump alloc

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The new allocator will be used to allocate guarded extents used as slabs
for guarded small allocations.
This commit is contained in:
Alex Lapenkou
2021-11-04 11:10:19 -07:00
committed by Alexander Lapenkov
parent 34b00f8969
commit 0f6da1257d
15 changed files with 521 additions and 107 deletions
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15
src/pac.c
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@@ -14,11 +14,6 @@ static void pac_dalloc_impl(tsdn_t *tsdn, pai_t *self, edata_t *edata,
bool *deferred_work_generated);
static uint64_t pac_time_until_deferred_work(tsdn_t *tsdn, pai_t *self);
static ehooks_t *
pac_ehooks_get(pac_t *pac) {
return base_ehooks_get(pac->base);
}
static inline void
pac_decay_data_get(pac_t *pac, extent_state_t state,
decay_t **r_decay, pac_decay_stats_t **r_decay_stats, ecache_t **r_ecache) {
@@ -139,14 +134,15 @@ pac_alloc_new_guarded(tsdn_t *tsdn, pac_t *pac, ehooks_t *ehooks, size_t size,
size_t alignment, bool zero) {
assert(alignment <= PAGE);
size_t size_with_guards = size + PAGE_GUARDS_SIZE;
size_t size_with_guards = size + SAN_PAGE_GUARDS_SIZE;
/* Alloc a non-guarded extent first.*/
edata_t *edata = pac_alloc_real(tsdn, pac, ehooks, size_with_guards,
/* alignment */ PAGE, zero, /* guarded */ false);
if (edata != NULL) {
/* Add guards around it. */
assert(edata_size_get(edata) == size_with_guards);
san_guard_pages(tsdn, ehooks, edata, pac->emap);
san_guard_pages(tsdn, ehooks, edata, pac->emap, true, true,
true);
}
assert(edata == NULL || (edata_guarded_get(edata) &&
edata_size_get(edata) == size));
@@ -222,7 +218,7 @@ pac_shrink_impl(tsdn_t *tsdn, pai_t *self, edata_t *edata, size_t old_size,
}
edata_t *trail = extent_split_wrapper(tsdn, pac, ehooks, edata,
new_size, shrink_amount);
new_size, shrink_amount, /* holding_core_locks */ false);
if (trail == NULL) {
return true;
}
@@ -253,7 +249,8 @@ pac_dalloc_impl(tsdn_t *tsdn, pai_t *self, edata_t *edata,
if (!edata_slab_get(edata) || !maps_coalesce) {
assert(edata_size_get(edata) >= SC_LARGE_MINCLASS ||
!maps_coalesce);
san_unguard_pages(tsdn, ehooks, edata, pac->emap);
san_unguard_pages_two_sided(tsdn, ehooks, edata,
pac->emap);
}
}