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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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1
include/jemalloc/internal/jemalloc_internal_inlines_a.h
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@ -24,6 +24,7 @@ size_t sa2u(size_t size, size_t alignment);
arena_t *arena_choose_impl(tsd_t *tsd, arena_t *arena, bool internal);
arena_t *arena_choose(tsd_t *tsd, arena_t *arena);
arena_t *arena_ichoose(tsd_t *tsd, arena_t *arena);
bool arena_is_auto(arena_t *arena);
arena_tdata_t *arena_tdata_get(tsd_t *tsd, unsigned ind,
bool refresh_if_missing);
arena_t *arena_get(tsdn_t *tsdn, unsigned ind, bool init_if_missing);

6
include/jemalloc/internal/jemalloc_internal_inlines_b.h
View File

@ -70,6 +70,12 @@ arena_ichoose(tsd_t *tsd, arena_t *arena) {
return arena_choose_impl(tsd, arena, true);
}
JEMALLOC_INLINE bool
arena_is_auto(arena_t *arena) {
assert(narenas_auto > 0);
return (arena_ind_get(arena) < narenas_auto);
}
JEMALLOC_ALWAYS_INLINE extent_t *
iealloc(tsdn_t *tsdn, const void *ptr) {
rtree_ctx_t rtree_ctx_fallback;

9
include/jemalloc/internal/jemalloc_internal_inlines_c.h
View File

@ -54,8 +54,7 @@ iallocztm(tsdn_t *tsdn, size_t size, szind_t ind, bool zero, tcache_t *tcache,
assert(size != 0);
assert(!is_internal || tcache == NULL);
assert(!is_internal || arena == NULL || arena_ind_get(arena) <
narenas_auto);
assert(!is_internal || arena == NULL || arena_is_auto(arena));
witness_assert_depth_to_rank(tsdn, WITNESS_RANK_CORE, 0);
ret = arena_malloc(tsdn, arena, size, ind, zero, tcache, slow_path);
@ -79,8 +78,7 @@ ipallocztm(tsdn_t *tsdn, size_t usize, size_t alignment, bool zero,
assert(usize != 0);
assert(usize == sa2u(usize, alignment));
assert(!is_internal || tcache == NULL);
assert(!is_internal || arena == NULL || arena_ind_get(arena) <
narenas_auto);
assert(!is_internal || arena == NULL || arena_is_auto(arena));
witness_assert_depth_to_rank(tsdn, WITNESS_RANK_CORE, 0);
ret = arena_palloc(tsdn, arena, usize, alignment, zero, tcache);
@ -113,8 +111,7 @@ idalloctm(tsdn_t *tsdn, void *ptr, tcache_t *tcache, alloc_ctx_t *alloc_ctx,
bool is_internal, bool slow_path) {
assert(ptr != NULL);
assert(!is_internal || tcache == NULL);
assert(!is_internal || arena_ind_get(iaalloc(tsdn, ptr)) <
narenas_auto);
assert(!is_internal || arena_is_auto(iaalloc(tsdn, ptr)));
witness_assert_depth_to_rank(tsdn, WITNESS_RANK_CORE, 0);
if (config_stats && is_internal) {
arena_internal_sub(iaalloc(tsdn, ptr), isalloc(tsdn, ptr));

33
src/arena.c
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@ -1032,13 +1032,24 @@ arena_bin_slabs_nonfull_tryget(arena_bin_t *bin) {
}
static void
arena_bin_slabs_full_insert(arena_bin_t *bin, extent_t *slab) {
arena_bin_slabs_full_insert(arena_t *arena, arena_bin_t *bin, extent_t *slab) {
assert(extent_nfree_get(slab) == 0);
/*
* Tracking extents is required by arena_reset, which is not allowed
* for auto arenas. Bypass this step to avoid touching the extent
* linkage (often results in cache misses) for auto arenas.
*/
if (arena_is_auto(arena)) {
return;
}
extent_list_append(&bin->slabs_full, slab);
}
static void
arena_bin_slabs_full_remove(arena_bin_t *bin, extent_t *slab) {
arena_bin_slabs_full_remove(arena_t *arena, arena_bin_t *bin, extent_t *slab) {
if (arena_is_auto(arena)) {
return;
}
extent_list_remove(&bin->slabs_full, slab);
}
@ -1106,7 +1117,7 @@ arena_reset(tsd_t *tsd, arena_t *arena) {
}
for (slab = extent_list_first(&bin->slabs_full); slab != NULL;
slab = extent_list_first(&bin->slabs_full)) {
arena_bin_slabs_full_remove(bin, slab);
arena_bin_slabs_full_remove(arena, bin, slab);
malloc_mutex_unlock(tsd_tsdn(tsd), &bin->lock);
arena_slab_dalloc(tsd_tsdn(tsd), arena, slab);
malloc_mutex_lock(tsd_tsdn(tsd), &bin->lock);
@ -1285,8 +1296,8 @@ arena_bin_malloc_hard(tsdn_t *tsdn, arena_t *arena, arena_bin_t *bin,
extent_t *slab;
bin_info = &arena_bin_info[binind];
if (bin->slabcur != NULL) {
arena_bin_slabs_full_insert(bin, bin->slabcur);
if (!arena_is_auto(arena) && bin->slabcur != NULL) {
arena_bin_slabs_full_insert(arena, bin, bin->slabcur);
bin->slabcur = NULL;
}
slab = arena_bin_nonfull_slab_get(tsdn, arena, bin, binind);
@ -1319,7 +1330,7 @@ arena_bin_malloc_hard(tsdn_t *tsdn, arena_t *arena, arena_bin_t *bin,
return ret;
}
arena_bin_slabs_full_insert(bin, bin->slabcur);
arena_bin_slabs_full_insert(arena, bin, bin->slabcur);
bin->slabcur = NULL;
}
@ -1559,7 +1570,7 @@ arena_dalloc_promoted(tsdn_t *tsdn, void *ptr, tcache_t *tcache,
}
static void
arena_dissociate_bin_slab(extent_t *slab, arena_bin_t *bin) {
arena_dissociate_bin_slab(arena_t *arena, extent_t *slab, arena_bin_t *bin) {
/* Dissociate slab from bin. */
if (slab == bin->slabcur) {
bin->slabcur = NULL;
@ -1573,7 +1584,7 @@ arena_dissociate_bin_slab(extent_t *slab, arena_bin_t *bin) {
* into the non-full slabs heap.
*/
if (bin_info->nregs == 1) {
arena_bin_slabs_full_remove(bin, slab);
arena_bin_slabs_full_remove(arena, bin, slab);
} else {
arena_bin_slabs_nonfull_remove(bin, slab);
}
@ -1611,7 +1622,7 @@ arena_bin_lower_slab(tsdn_t *tsdn, arena_t *arena, extent_t *slab,
if (extent_nfree_get(bin->slabcur) > 0) {
arena_bin_slabs_nonfull_insert(bin, bin->slabcur);
} else {
arena_bin_slabs_full_insert(bin, bin->slabcur);
arena_bin_slabs_full_insert(arena, bin, bin->slabcur);
}
bin->slabcur = slab;
if (config_stats) {
@ -1637,10 +1648,10 @@ arena_dalloc_bin_locked_impl(tsdn_t *tsdn, arena_t *arena, extent_t *slab,
arena_slab_reg_dalloc(tsdn, slab, slab_data, ptr);
unsigned nfree = extent_nfree_get(slab);
if (nfree == bin_info->nregs) {
arena_dissociate_bin_slab(slab, bin);
arena_dissociate_bin_slab(arena, slab, bin);
arena_dalloc_bin_slab(tsdn, arena, slab, bin);
} else if (nfree == 1 && slab != bin->slabcur) {
arena_bin_slabs_full_remove(bin, slab);
arena_bin_slabs_full_remove(arena, bin, slab);
arena_bin_lower_slab(tsdn, arena, slab, bin);
}

7
src/ctl.c
View File

@ -1846,13 +1846,8 @@ arena_i_reset_destroy_helper(tsd_t *tsd, const size_t *mib, size_t miblen,
WRITEONLY();
MIB_UNSIGNED(*arena_ind, 1);
if (*arena_ind < narenas_auto) {
ret = EFAULT;
goto label_return;
}
*arena = arena_get(tsd_tsdn(tsd), *arena_ind, false);
if (*arena == NULL) {
if (*arena == NULL || arena_is_auto(*arena)) {
ret = EFAULT;
goto label_return;
}

25
src/large.c
View File

@ -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);
}