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Bypass extent tracking for auto arenas.

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Tracking extents is required by arena_reset.  To support this, the extent
linkage was used for tracking 1) large allocations, and 2) full slabs.  However
modifying the extent linkage could be an expensive operation as it likely incurs
cache misses.  Since we forbid arena_reset on auto arenas, let's bypass the
linkage operations for auto arenas.
This commit is contained in:
Qi Wang
2017-04-20 15:19:02 -07:00
committed by Qi Wang
parent fed9a880c8
commit 5aa46f027d
6 changed files with 49 additions and 32 deletions
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25
src/large.c
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@@ -46,10 +46,13 @@ large_palloc(tsdn_t *tsdn, arena_t *arena, size_t usize, size_t alignment,
return NULL;
}
/* Insert extent into large. */
malloc_mutex_lock(tsdn, &arena->large_mtx);
extent_list_append(&arena->large, extent);
malloc_mutex_unlock(tsdn, &arena->large_mtx);
/* See comments in arena_bin_slabs_full_insert(). */
if (!arena_is_auto(arena)) {
/* Insert extent into large. */
malloc_mutex_lock(tsdn, &arena->large_mtx);
extent_list_append(&arena->large, extent);
malloc_mutex_unlock(tsdn, &arena->large_mtx);
}
if (config_prof && arena_prof_accum(tsdn, arena, usize)) {
prof_idump(tsdn);
}
@@ -318,16 +321,20 @@ large_ralloc(tsdn_t *tsdn, arena_t *arena, extent_t *extent, size_t usize,
static void
large_dalloc_prep_impl(tsdn_t *tsdn, arena_t *arena, extent_t *extent,
bool junked_locked) {
if (!junked_locked) {
malloc_mutex_lock(tsdn, &arena->large_mtx);
extent_list_remove(&arena->large, extent);
malloc_mutex_unlock(tsdn, &arena->large_mtx);
/* See comments in arena_bin_slabs_full_insert(). */
if (!arena_is_auto(arena)) {
malloc_mutex_lock(tsdn, &arena->large_mtx);
extent_list_remove(&arena->large, extent);
malloc_mutex_unlock(tsdn, &arena->large_mtx);
}
large_dalloc_maybe_junk(extent_addr_get(extent),
extent_usize_get(extent));
} else {
malloc_mutex_assert_owner(tsdn, &arena->large_mtx);
extent_list_remove(&arena->large, extent);
if (!arena_is_auto(arena)) {
extent_list_remove(&arena->large, extent);
}
}
arena_extent_dalloc_large_prep(tsdn, arena, extent);
}