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Fast-path improvement: reduce # of branches and unnecessary operations.

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- Combine multiple runtime branches into a single malloc_slow check.
- Avoid calling arena_choose / size2index / index2size on fast path.
- A few micro optimizations.
This commit is contained in:
Qi Wang
2015-10-27 15:12:10 -07:00
committed by Jason Evans
parent 710ca112e3
commit f4a0f32d34
11 changed files with 357 additions and 214 deletions
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6
include/jemalloc/internal/prof.h
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@@ -436,16 +436,16 @@ prof_sample_accum_update(tsd_t *tsd, size_t usize, bool update,
cassert(config_prof);
tdata = prof_tdata_get(tsd, true);
if ((uintptr_t)tdata <= (uintptr_t)PROF_TDATA_STATE_MAX)
if (unlikely((uintptr_t)tdata <= (uintptr_t)PROF_TDATA_STATE_MAX))
tdata = NULL;
if (tdata_out != NULL)
*tdata_out = tdata;
if (tdata == NULL)
if (unlikely(tdata == NULL))
return (true);
if (tdata->bytes_until_sample >= usize) {
if (likely(tdata->bytes_until_sample >= usize)) {
if (update)
tdata->bytes_until_sample -= usize;
return (true);