Merge pull request #73 from bmaurer/smallmalloc
Smaller malloc hot path
This commit is contained in:
commit
3e3caf03af
@ -385,6 +385,7 @@ extern ssize_t opt_lg_dirty_mult;
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* and all accesses are via the SMALL_SIZE2BIN macro.
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*/
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extern uint8_t const small_size2bin[];
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extern uint32_t const small_bin2size[];
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#define SMALL_SIZE2BIN(s) (small_size2bin[(s-1) >> LG_TINY_MIN])
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extern arena_bin_info_t arena_bin_info[NBINS];
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@ -964,7 +965,7 @@ arena_salloc(const void *ptr, bool demote)
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assert(arena_mapbits_large_get(chunk, pageind) != 0 ||
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arena_ptr_small_binind_get(ptr, arena_mapbits_get(chunk,
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pageind)) == binind);
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ret = arena_bin_info[binind].reg_size;
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ret = small_bin2size[binind];
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}
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return (ret);
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@ -526,7 +526,7 @@ s2u(size_t size)
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{
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if (size <= SMALL_MAXCLASS)
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return (arena_bin_info[SMALL_SIZE2BIN(size)].reg_size);
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return (small_bin2size[SMALL_SIZE2BIN(size)]);
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if (size <= arena_maxclass)
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return (PAGE_CEILING(size));
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return (CHUNK_CEILING(size));
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@ -569,7 +569,7 @@ sa2u(size_t size, size_t alignment)
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if (usize <= arena_maxclass && alignment <= PAGE) {
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if (usize <= SMALL_MAXCLASS)
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return (arena_bin_info[SMALL_SIZE2BIN(usize)].reg_size);
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return (small_bin2size[SMALL_SIZE2BIN(usize)]);
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return (PAGE_CEILING(usize));
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} else {
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size_t run_size;
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@ -298,6 +298,7 @@ prof_idump
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prof_interval
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prof_lookup
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prof_malloc
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prof_malloc_record_object
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prof_mdump
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prof_postfork_child
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prof_postfork_parent
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@ -344,6 +345,7 @@ rtree_set
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s2u
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sa2u
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set_errno
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small_bin2size
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small_size2bin
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stats_cactive
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stats_cactive_add
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@ -383,6 +385,7 @@ tcache_event
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tcache_event_hard
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tcache_flush
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tcache_get
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tcache_get_hard
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tcache_initialized
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tcache_maxclass
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tcache_salloc
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@ -177,8 +177,7 @@ struct prof_tdata_s {
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/* Sampling state. */
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uint64_t prng_state;
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uint64_t threshold;
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uint64_t accum;
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uint64_t bytes_until_sample;
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/* State used to avoid dumping while operating on prof internals. */
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bool enq;
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@ -239,6 +238,7 @@ bool prof_boot2(void);
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void prof_prefork(void);
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void prof_postfork_parent(void);
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void prof_postfork_child(void);
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void prof_sample_threshold_update(prof_tdata_t *prof_tdata);
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#endif /* JEMALLOC_H_EXTERNS */
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/******************************************************************************/
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@ -250,49 +250,13 @@ void prof_postfork_child(void);
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\
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assert(size == s2u(size)); \
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\
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prof_tdata = prof_tdata_get(true); \
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if ((uintptr_t)prof_tdata <= (uintptr_t)PROF_TDATA_STATE_MAX) { \
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if (prof_tdata != NULL) \
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ret = (prof_thr_cnt_t *)(uintptr_t)1U; \
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else \
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ret = NULL; \
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break; \
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} \
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\
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if (opt_prof_active == false) { \
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/* Sampling is currently inactive, so avoid sampling. */\
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if (!opt_prof_active || \
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prof_sample_accum_update(size, false, &prof_tdata)) { \
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ret = (prof_thr_cnt_t *)(uintptr_t)1U; \
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} else if (opt_lg_prof_sample == 0) { \
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/* Don't bother with sampling logic, since sampling */\
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/* interval is 1. */\
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} else { \
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bt_init(&bt, prof_tdata->vec); \
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prof_backtrace(&bt, nignore); \
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ret = prof_lookup(&bt); \
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} else { \
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if (prof_tdata->threshold == 0) { \
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/* Initialize. Seed the prng differently for */\
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/* each thread. */\
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prof_tdata->prng_state = \
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(uint64_t)(uintptr_t)&size; \
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prof_sample_threshold_update(prof_tdata); \
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} \
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\
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/* Determine whether to capture a backtrace based on */\
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/* whether size is enough for prof_accum to reach */\
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/* prof_tdata->threshold. However, delay updating */\
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/* these variables until prof_{m,re}alloc(), because */\
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/* we don't know for sure that the allocation will */\
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/* succeed. */\
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/* */\
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/* Use subtraction rather than addition to avoid */\
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/* potential integer overflow. */\
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if (size >= prof_tdata->threshold - \
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prof_tdata->accum) { \
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bt_init(&bt, prof_tdata->vec); \
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prof_backtrace(&bt, nignore); \
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ret = prof_lookup(&bt); \
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} else \
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ret = (prof_thr_cnt_t *)(uintptr_t)1U; \
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} \
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} while (0)
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@ -300,10 +264,13 @@ void prof_postfork_child(void);
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malloc_tsd_protos(JEMALLOC_ATTR(unused), prof_tdata, prof_tdata_t *)
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prof_tdata_t *prof_tdata_get(bool create);
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void prof_sample_threshold_update(prof_tdata_t *prof_tdata);
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void prof_sample_accum_update(size_t size, bool commit,
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prof_tdata_t **prof_tdata_out);
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prof_ctx_t *prof_ctx_get(const void *ptr);
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void prof_ctx_set(const void *ptr, prof_ctx_t *ctx);
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bool prof_sample_accum_update(size_t size);
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void prof_malloc_record_object(const void *ptr, size_t usize,
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prof_thr_cnt_t *cnt)
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void prof_malloc(const void *ptr, size_t usize, prof_thr_cnt_t *cnt);
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void prof_realloc(const void *ptr, size_t usize, prof_thr_cnt_t *cnt,
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size_t old_usize, prof_ctx_t *old_ctx);
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@ -330,55 +297,6 @@ prof_tdata_get(bool create)
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return (prof_tdata);
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}
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JEMALLOC_INLINE void
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prof_sample_threshold_update(prof_tdata_t *prof_tdata)
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{
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/*
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* The body of this function is compiled out unless heap profiling is
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* enabled, so that it is possible to compile jemalloc with floating
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* point support completely disabled. Avoiding floating point code is
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* important on memory-constrained systems, but it also enables a
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* workaround for versions of glibc that don't properly save/restore
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* floating point registers during dynamic lazy symbol loading (which
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* internally calls into whatever malloc implementation happens to be
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* integrated into the application). Note that some compilers (e.g.
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* gcc 4.8) may use floating point registers for fast memory moves, so
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* jemalloc must be compiled with such optimizations disabled (e.g.
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* -mno-sse) in order for the workaround to be complete.
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*/
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#ifdef JEMALLOC_PROF
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uint64_t r;
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double u;
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cassert(config_prof);
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/*
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* Compute sample threshold as a geometrically distributed random
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* variable with mean (2^opt_lg_prof_sample).
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*
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* __ __
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* | log(u) | 1
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* prof_tdata->threshold = | -------- |, where p = -------------------
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* | log(1-p) | opt_lg_prof_sample
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* 2
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*
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* For more information on the math, see:
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*
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* Non-Uniform Random Variate Generation
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* Luc Devroye
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* Springer-Verlag, New York, 1986
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* pp 500
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* (http://luc.devroye.org/rnbookindex.html)
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*/
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prng64(r, 53, prof_tdata->prng_state,
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UINT64_C(6364136223846793005), UINT64_C(1442695040888963407));
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u = (double)r * (1.0/9007199254740992.0L);
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prof_tdata->threshold = (uint64_t)(log(u) /
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log(1.0 - (1.0 / (double)((uint64_t)1U << opt_lg_prof_sample))))
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+ (uint64_t)1U;
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#endif
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}
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JEMALLOC_INLINE prof_ctx_t *
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prof_ctx_get(const void *ptr)
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{
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@ -415,34 +333,58 @@ prof_ctx_set(const void *ptr, prof_ctx_t *ctx)
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}
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JEMALLOC_INLINE bool
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prof_sample_accum_update(size_t size)
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prof_sample_accum_update(size_t size, bool commit,
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prof_tdata_t **prof_tdata_out)
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{
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prof_tdata_t *prof_tdata;
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cassert(config_prof);
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/* Sampling logic is unnecessary if the interval is 1. */
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assert(opt_lg_prof_sample != 0);
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prof_tdata = prof_tdata_get(false);
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prof_tdata = prof_tdata_get(true);
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if ((uintptr_t)prof_tdata <= (uintptr_t)PROF_TDATA_STATE_MAX)
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prof_tdata = NULL;
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if (prof_tdata_out != NULL)
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*prof_tdata_out = prof_tdata;
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if (prof_tdata == NULL)
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return (true);
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/* Take care to avoid integer overflow. */
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if (size >= prof_tdata->threshold - prof_tdata->accum) {
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prof_tdata->accum -= (prof_tdata->threshold - size);
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/* Compute new sample threshold. */
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prof_sample_threshold_update(prof_tdata);
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while (prof_tdata->accum >= prof_tdata->threshold) {
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prof_tdata->accum -= prof_tdata->threshold;
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prof_sample_threshold_update(prof_tdata);
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}
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return (false);
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} else {
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prof_tdata->accum += size;
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if (prof_tdata->bytes_until_sample >= size) {
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if (commit)
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prof_tdata->bytes_until_sample -= size;
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return (true);
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} else {
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/* Compute new sample threshold. */
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if (commit)
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prof_sample_threshold_update(prof_tdata);
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return (false);
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}
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}
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JEMALLOC_INLINE void
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prof_malloc_record_object(const void *ptr, size_t usize, prof_thr_cnt_t *cnt) {
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prof_ctx_set(ptr, cnt->ctx);
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cnt->epoch++;
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/*********/
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mb_write();
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/*********/
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cnt->cnts.curobjs++;
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cnt->cnts.curbytes += usize;
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if (opt_prof_accum) {
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cnt->cnts.accumobjs++;
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cnt->cnts.accumbytes += usize;
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}
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/*********/
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mb_write();
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/*********/
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cnt->epoch++;
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/*********/
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mb_write();
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/*********/
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}
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JEMALLOC_INLINE void
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prof_malloc(const void *ptr, size_t usize, prof_thr_cnt_t *cnt)
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{
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@ -451,40 +393,20 @@ prof_malloc(const void *ptr, size_t usize, prof_thr_cnt_t *cnt)
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assert(ptr != NULL);
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assert(usize == isalloc(ptr, true));
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if (opt_lg_prof_sample != 0) {
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if (prof_sample_accum_update(usize)) {
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/*
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* Don't sample. For malloc()-like allocation, it is
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* always possible to tell in advance how large an
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* object's usable size will be, so there should never
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* be a difference between the usize passed to
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* PROF_ALLOC_PREP() and prof_malloc().
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*/
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assert((uintptr_t)cnt == (uintptr_t)1U);
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}
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if (prof_sample_accum_update(usize, true, NULL)) {
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/*
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* Don't sample. For malloc()-like allocation, it is
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* always possible to tell in advance how large an
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* object's usable size will be, so there should never
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* be a difference between the usize passed to
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* PROF_ALLOC_PREP() and prof_malloc().
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*/
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assert((uintptr_t)cnt == (uintptr_t)1U);
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}
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if ((uintptr_t)cnt > (uintptr_t)1U) {
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prof_ctx_set(ptr, cnt->ctx);
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cnt->epoch++;
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/*********/
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mb_write();
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/*********/
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cnt->cnts.curobjs++;
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cnt->cnts.curbytes += usize;
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if (opt_prof_accum) {
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cnt->cnts.accumobjs++;
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cnt->cnts.accumbytes += usize;
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}
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/*********/
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mb_write();
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/*********/
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cnt->epoch++;
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/*********/
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mb_write();
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/*********/
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} else
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if ((uintptr_t)cnt > (uintptr_t)1U)
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prof_malloc_record_object(ptr, usize, cnt);
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else
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prof_ctx_set(ptr, (prof_ctx_t *)(uintptr_t)1U);
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}
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@ -499,18 +421,16 @@ prof_realloc(const void *ptr, size_t usize, prof_thr_cnt_t *cnt,
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if (ptr != NULL) {
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assert(usize == isalloc(ptr, true));
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if (opt_lg_prof_sample != 0) {
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if (prof_sample_accum_update(usize)) {
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/*
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* Don't sample. The usize passed to
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* PROF_ALLOC_PREP() was larger than what
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* actually got allocated, so a backtrace was
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* captured for this allocation, even though
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* its actual usize was insufficient to cross
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* the sample threshold.
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*/
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cnt = (prof_thr_cnt_t *)(uintptr_t)1U;
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}
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if (prof_sample_accum_update(usize, true, NULL)) {
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/*
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* Don't sample. The usize passed to
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* PROF_ALLOC_PREP() was larger than what
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* actually got allocated, so a backtrace was
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* captured for this allocation, even though
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* its actual usize was insufficient to cross
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* the sample threshold.
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*/
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cnt = (prof_thr_cnt_t *)(uintptr_t)1U;
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}
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}
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@ -110,6 +110,7 @@ void tcache_bin_flush_large(tcache_bin_t *tbin, size_t binind, unsigned rem,
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tcache_t *tcache);
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void tcache_arena_associate(tcache_t *tcache, arena_t *arena);
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void tcache_arena_dissociate(tcache_t *tcache);
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tcache_t *tcache_get_hard(tcache_t *tcache, bool create);
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tcache_t *tcache_create(arena_t *arena);
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void tcache_destroy(tcache_t *tcache);
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void tcache_thread_cleanup(void *arg);
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@ -220,39 +221,7 @@ tcache_get(bool create)
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if ((uintptr_t)tcache <= (uintptr_t)TCACHE_STATE_MAX) {
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if (tcache == TCACHE_STATE_DISABLED)
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return (NULL);
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if (tcache == NULL) {
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if (create == false) {
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/*
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* Creating a tcache here would cause
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* allocation as a side effect of free().
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* Ordinarily that would be okay since
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* tcache_create() failure is a soft failure
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* that doesn't propagate. However, if TLS
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* data are freed via free() as in glibc,
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* subtle corruption could result from setting
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* a TLS variable after its backing memory is
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* freed.
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*/
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return (NULL);
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}
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if (tcache_enabled_get() == false) {
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tcache_enabled_set(false); /* Memoize. */
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return (NULL);
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}
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return (tcache_create(choose_arena(NULL)));
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}
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if (tcache == TCACHE_STATE_PURGATORY) {
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/*
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* Make a note that an allocator function was called
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* after tcache_thread_cleanup() was called.
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*/
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tcache = TCACHE_STATE_REINCARNATED;
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tcache_tsd_set(&tcache);
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return (NULL);
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}
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if (tcache == TCACHE_STATE_REINCARNATED)
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return (NULL);
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not_reached();
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tcache = tcache_get_hard(tcache, create);
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}
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return (tcache);
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@ -297,14 +266,14 @@ tcache_alloc_small(tcache_t *tcache, size_t size, bool zero)
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binind = SMALL_SIZE2BIN(size);
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assert(binind < NBINS);
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tbin = &tcache->tbins[binind];
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size = arena_bin_info[binind].reg_size;
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size = small_bin2size[binind];
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ret = tcache_alloc_easy(tbin);
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if (ret == NULL) {
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ret = tcache_alloc_small_hard(tcache, tbin, binind);
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if (ret == NULL)
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return (NULL);
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}
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assert(tcache_salloc(ret) == arena_bin_info[binind].reg_size);
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assert(tcache_salloc(ret) == size);
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if (zero == false) {
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if (config_fill) {
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@ -325,7 +294,7 @@ tcache_alloc_small(tcache_t *tcache, size_t size, bool zero)
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if (config_stats)
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tbin->tstats.nrequests++;
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if (config_prof)
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tcache->prof_accumbytes += arena_bin_info[binind].reg_size;
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tcache->prof_accumbytes += size;
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tcache_event(tcache);
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return (ret);
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}
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|
10
src/arena.c
10
src/arena.c
@ -7,6 +7,14 @@
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ssize_t opt_lg_dirty_mult = LG_DIRTY_MULT_DEFAULT;
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arena_bin_info_t arena_bin_info[NBINS];
|
||||
|
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JEMALLOC_ALIGNED(CACHELINE)
|
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const uint32_t small_bin2size[NBINS] = {
|
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#define SIZE_CLASS(bin, delta, size) \
|
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size,
|
||||
SIZE_CLASSES
|
||||
#undef SIZE_CLASS
|
||||
};
|
||||
|
||||
JEMALLOC_ALIGNED(CACHELINE)
|
||||
const uint8_t small_size2bin[] = {
|
||||
#define S2B_8(i) i,
|
||||
@ -1615,7 +1623,7 @@ arena_malloc_small(arena_t *arena, size_t size, bool zero)
|
||||
binind = SMALL_SIZE2BIN(size);
|
||||
assert(binind < NBINS);
|
||||
bin = &arena->bins[binind];
|
||||
size = arena_bin_info[binind].reg_size;
|
||||
size = small_bin2size[binind];
|
||||
|
||||
malloc_mutex_lock(&bin->lock);
|
||||
if ((run = bin->runcur) != NULL && run->nfree > 0)
|
||||
|
65
src/prof.c
65
src/prof.c
@ -645,6 +645,66 @@ prof_lookup(prof_bt_t *bt)
|
||||
return (ret.p);
|
||||
}
|
||||
|
||||
|
||||
void
|
||||
prof_sample_threshold_update(prof_tdata_t *prof_tdata)
|
||||
{
|
||||
/*
|
||||
* The body of this function is compiled out unless heap profiling is
|
||||
* enabled, so that it is possible to compile jemalloc with floating
|
||||
* point support completely disabled. Avoiding floating point code is
|
||||
* important on memory-constrained systems, but it also enables a
|
||||
* workaround for versions of glibc that don't properly save/restore
|
||||
* floating point registers during dynamic lazy symbol loading (which
|
||||
* internally calls into whatever malloc implementation happens to be
|
||||
* integrated into the application). Note that some compilers (e.g.
|
||||
* gcc 4.8) may use floating point registers for fast memory moves, so
|
||||
* jemalloc must be compiled with such optimizations disabled (e.g.
|
||||
* -mno-sse) in order for the workaround to be complete.
|
||||
*/
|
||||
#ifdef JEMALLOC_PROF
|
||||
uint64_t r;
|
||||
double u;
|
||||
|
||||
if (!config_prof)
|
||||
return;
|
||||
|
||||
if (prof_tdata == NULL)
|
||||
prof_tdata = prof_tdata_get(false);
|
||||
|
||||
if (opt_lg_prof_sample == 0) {
|
||||
prof_tdata->bytes_until_sample = 0;
|
||||
return;
|
||||
}
|
||||
|
||||
/*
|
||||
* Compute sample threshold as a geometrically distributed random
|
||||
* variable with mean (2^opt_lg_prof_sample).
|
||||
*
|
||||
* __ __
|
||||
* | log(u) | 1
|
||||
* prof_tdata->threshold = | -------- |, where p = -------------------
|
||||
* | log(1-p) | opt_lg_prof_sample
|
||||
* 2
|
||||
*
|
||||
* For more information on the math, see:
|
||||
*
|
||||
* Non-Uniform Random Variate Generation
|
||||
* Luc Devroye
|
||||
* Springer-Verlag, New York, 1986
|
||||
* pp 500
|
||||
* (http://luc.devroye.org/rnbookindex.html)
|
||||
*/
|
||||
prng64(r, 53, prof_tdata->prng_state,
|
||||
UINT64_C(6364136223846793005), UINT64_C(1442695040888963407));
|
||||
u = (double)r * (1.0/9007199254740992.0L);
|
||||
prof_tdata->bytes_until_sample = (uint64_t)(log(u) /
|
||||
log(1.0 - (1.0 / (double)((uint64_t)1U << opt_lg_prof_sample))))
|
||||
+ (uint64_t)1U;
|
||||
#endif
|
||||
}
|
||||
|
||||
|
||||
#ifdef JEMALLOC_JET
|
||||
size_t
|
||||
prof_bt_count(void)
|
||||
@ -1224,9 +1284,8 @@ prof_tdata_init(void)
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
prof_tdata->prng_state = 0;
|
||||
prof_tdata->threshold = 0;
|
||||
prof_tdata->accum = 0;
|
||||
prof_tdata->prng_state = (uint64_t)(uintptr_t)prof_tdata;
|
||||
prof_sample_threshold_update(prof_tdata);
|
||||
|
||||
prof_tdata->enq = false;
|
||||
prof_tdata->enq_idump = false;
|
||||
|
40
src/tcache.c
40
src/tcache.c
@ -265,6 +265,46 @@ tcache_arena_dissociate(tcache_t *tcache)
|
||||
}
|
||||
}
|
||||
|
||||
tcache_t *
|
||||
tcache_get_hard(tcache_t *tcache, bool create)
|
||||
{
|
||||
|
||||
if (tcache == NULL) {
|
||||
if (create == false) {
|
||||
/*
|
||||
* Creating a tcache here would cause
|
||||
* allocation as a side effect of free().
|
||||
* Ordinarily that would be okay since
|
||||
* tcache_create() failure is a soft failure
|
||||
* that doesn't propagate. However, if TLS
|
||||
* data are freed via free() as in glibc,
|
||||
* subtle corruption could result from setting
|
||||
* a TLS variable after its backing memory is
|
||||
* freed.
|
||||
*/
|
||||
return (NULL);
|
||||
}
|
||||
if (tcache_enabled_get() == false) {
|
||||
tcache_enabled_set(false); /* Memoize. */
|
||||
return (NULL);
|
||||
}
|
||||
return (tcache_create(choose_arena(NULL)));
|
||||
}
|
||||
if (tcache == TCACHE_STATE_PURGATORY) {
|
||||
/*
|
||||
* Make a note that an allocator function was called
|
||||
* after tcache_thread_cleanup() was called.
|
||||
*/
|
||||
tcache = TCACHE_STATE_REINCARNATED;
|
||||
tcache_tsd_set(&tcache);
|
||||
return (NULL);
|
||||
}
|
||||
if (tcache == TCACHE_STATE_REINCARNATED)
|
||||
return (NULL);
|
||||
not_reached();
|
||||
return (NULL);
|
||||
}
|
||||
|
||||
tcache_t *
|
||||
tcache_create(arena_t *arena)
|
||||
{
|
||||
|
Loading…
Reference in New Issue
Block a user