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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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7
src/ctl.c
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@ -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;
}