project-base/server-skynet-source-3rd-jemalloc
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Fix rallocx() sampling code to not eagerly commit sampler update.

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rallocx() for an alignment-constrained request may end up with a
smaller-than-worst-case size if in-place reallocation succeeds due to
serendipitous alignment.  In such cases, sampling may not happen.
This commit is contained in:
Jason Evans 2016-06-01 16:19:22 -07:00
parent 20cd2de5ef
commit fa09fe798a
1 changed files with 3 additions and 3 deletions
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6
src/jemalloc.c
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@ -2222,7 +2222,7 @@ irallocx_prof(tsd_t *tsd, void *old_ptr, size_t old_usize, size_t size,
prof_active = prof_active_get_unlocked(); prof_active = prof_active_get_unlocked();
old_tctx = prof_tctx_get(tsd_tsdn(tsd), old_ptr); old_tctx = prof_tctx_get(tsd_tsdn(tsd), old_ptr);
tctx = prof_alloc_prep(tsd, *usize, prof_active, true); tctx = prof_alloc_prep(tsd, *usize, prof_active, false);
if (unlikely((uintptr_t)tctx != (uintptr_t)1U)) { if (unlikely((uintptr_t)tctx != (uintptr_t)1U)) {
p = irallocx_prof_sample(tsd, old_ptr, old_usize, *usize, p = irallocx_prof_sample(tsd, old_ptr, old_usize, *usize,
alignment, zero, tcache, arena, tctx); alignment, zero, tcache, arena, tctx);
@ -2231,7 +2231,7 @@ irallocx_prof(tsd_t *tsd, void *old_ptr, size_t old_usize, size_t size,
tcache, arena); tcache, arena);
} }
if (unlikely(p == NULL)) { if (unlikely(p == NULL)) {
prof_alloc_rollback(tsd, tctx, true); prof_alloc_rollback(tsd, tctx, false);
return (NULL); return (NULL);
} }
@ -2246,7 +2246,7 @@ irallocx_prof(tsd_t *tsd, void *old_ptr, size_t old_usize, size_t size,
*/ */
*usize = isalloc(tsd_tsdn(tsd), p, config_prof); *usize = isalloc(tsd_tsdn(tsd), p, config_prof);
} }
prof_realloc(tsd, p, *usize, tctx, prof_active, true, old_ptr, prof_realloc(tsd, p, *usize, tctx, prof_active, false, old_ptr,
old_usize, old_tctx); old_usize, old_tctx);
return (p); return (p);