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Switch to fine-grained reentrancy support.

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Previously we had a general detection and support of reentrancy, at the cost of
having branches and inc / dec operations on fast paths.  To avoid taxing fast
paths, we move the reentrancy operations onto tsd slow state, and only modify
reentrancy level around external calls (that might trigger reentrancy).
This commit is contained in:
Qi Wang
2017-04-12 16:16:27 -07:00
committed by Qi Wang
parent b348ba29bb
commit c2fcf9c2cf
8 changed files with 90 additions and 86 deletions
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23
include/jemalloc/internal/jemalloc_internal_inlines_a.h
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@@ -33,6 +33,8 @@ tcache_t *tcache_get(tsd_t *tsd);
malloc_cpuid_t malloc_getcpu(void);
unsigned percpu_arena_choose(void);
unsigned percpu_arena_ind_limit(void);
void pre_reentrancy(tsd_t *tsd);
void post_reentrancy(tsd_t *tsd);
#endif
#if (defined(JEMALLOC_ENABLE_INLINE) || defined(JEMALLOC_C_))
@@ -445,6 +447,27 @@ tcache_get(tsd_t *tsd) {
return tsd_tcachep_get(tsd);
}
JEMALLOC_INLINE void
pre_reentrancy(tsd_t *tsd) {
bool fast = tsd_fast(tsd);
++*tsd_reentrancy_levelp_get(tsd);
if (fast) {
/* Prepare slow path for reentrancy. */
tsd_slow_update(tsd);
assert(tsd->state == tsd_state_nominal_slow);
}
}
JEMALLOC_INLINE void
post_reentrancy(tsd_t *tsd) {
int8_t *reentrancy_level = tsd_reentrancy_levelp_get(tsd);
assert(*reentrancy_level > 0);
if (--*reentrancy_level == 0) {
tsd_slow_update(tsd);
}
}
#endif
#endif /* JEMALLOC_INTERNAL_INLINES_A_H */