d6feed6e66
While working on #852, I noticed the prng state is atomic. This is the only atomic use of prng in all of jemalloc. Instead, use a threadlocal prng state if possible to avoid unnecessary cache line contention.
327 lines
9.4 KiB
C
327 lines
9.4 KiB
C
#ifndef JEMALLOC_INTERNAL_TSD_H
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#define JEMALLOC_INTERNAL_TSD_H
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#include "jemalloc/internal/arena_types.h"
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#include "jemalloc/internal/assert.h"
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#include "jemalloc/internal/jemalloc_internal_externs.h"
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#include "jemalloc/internal/prof_types.h"
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#include "jemalloc/internal/ql.h"
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#include "jemalloc/internal/rtree_tsd.h"
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#include "jemalloc/internal/tcache_types.h"
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#include "jemalloc/internal/tcache_structs.h"
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#include "jemalloc/internal/util.h"
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#include "jemalloc/internal/witness.h"
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/*
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* Thread-Specific-Data layout
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* --- data accessed on tcache fast path: state, rtree_ctx, stats, prof ---
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* s: state
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* e: tcache_enabled
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* m: thread_allocated (config_stats)
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* f: thread_deallocated (config_stats)
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* p: prof_tdata (config_prof)
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* c: rtree_ctx (rtree cache accessed on deallocation)
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* t: tcache
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* --- data not accessed on tcache fast path: arena-related fields ---
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* d: arenas_tdata_bypass
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* r: reentrancy_level
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* x: narenas_tdata
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* i: iarena
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* a: arena
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* o: arenas_tdata
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* Loading TSD data is on the critical path of basically all malloc operations.
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* In particular, tcache and rtree_ctx rely on hot CPU cache to be effective.
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* Use a compact layout to reduce cache footprint.
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* +--- 64-bit and 64B cacheline; 1B each letter; First byte on the left. ---+
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* |---------------------------- 1st cacheline ----------------------------|
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* | sedrxxxx mmmmmmmm ffffffff pppppppp [c * 32 ........ ........ .......] |
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* |---------------------------- 2nd cacheline ----------------------------|
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* | [c * 64 ........ ........ ........ ........ ........ ........ .......] |
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* |---------------------------- 3nd cacheline ----------------------------|
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* | [c * 32 ........ ........ .......] iiiiiiii aaaaaaaa oooooooo [t...... |
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* +-------------------------------------------------------------------------+
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* Note: the entire tcache is embedded into TSD and spans multiple cachelines.
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*
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* The last 3 members (i, a and o) before tcache isn't really needed on tcache
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* fast path. However we have a number of unused tcache bins and witnesses
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* (never touched unless config_debug) at the end of tcache, so we place them
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* there to avoid breaking the cachelines and possibly paging in an extra page.
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*/
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#ifdef JEMALLOC_JET
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typedef void (*test_callback_t)(int *);
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# define MALLOC_TSD_TEST_DATA_INIT 0x72b65c10
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# define MALLOC_TEST_TSD \
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O(test_data, int, int) \
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O(test_callback, test_callback_t, int)
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# define MALLOC_TEST_TSD_INITIALIZER , MALLOC_TSD_TEST_DATA_INIT, NULL
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#else
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# define MALLOC_TEST_TSD
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# define MALLOC_TEST_TSD_INITIALIZER
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#endif
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/* O(name, type, nullable type */
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#define MALLOC_TSD \
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O(tcache_enabled, bool, bool) \
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O(arenas_tdata_bypass, bool, bool) \
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O(reentrancy_level, int8_t, int8_t) \
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O(narenas_tdata, uint32_t, uint32_t) \
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O(offset_state, uint64_t, uint64_t) \
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O(thread_allocated, uint64_t, uint64_t) \
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O(thread_deallocated, uint64_t, uint64_t) \
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O(prof_tdata, prof_tdata_t *, prof_tdata_t *) \
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O(rtree_ctx, rtree_ctx_t, rtree_ctx_t) \
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O(iarena, arena_t *, arena_t *) \
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O(arena, arena_t *, arena_t *) \
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O(arenas_tdata, arena_tdata_t *, arena_tdata_t *)\
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O(tcache, tcache_t, tcache_t) \
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O(witness_tsd, witness_tsd_t, witness_tsdn_t) \
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MALLOC_TEST_TSD
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#define TSD_INITIALIZER { \
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tsd_state_uninitialized, \
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TCACHE_ENABLED_ZERO_INITIALIZER, \
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false, \
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0, \
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0, \
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0, \
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0, \
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0, \
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NULL, \
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RTREE_CTX_ZERO_INITIALIZER, \
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NULL, \
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NULL, \
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NULL, \
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TCACHE_ZERO_INITIALIZER, \
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WITNESS_TSD_INITIALIZER \
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MALLOC_TEST_TSD_INITIALIZER \
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}
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enum {
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tsd_state_nominal = 0, /* Common case --> jnz. */
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tsd_state_nominal_slow = 1, /* Initialized but on slow path. */
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/* the above 2 nominal states should be lower values. */
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tsd_state_nominal_max = 1, /* used for comparison only. */
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tsd_state_minimal_initialized = 2,
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tsd_state_purgatory = 3,
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tsd_state_reincarnated = 4,
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tsd_state_uninitialized = 5
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};
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/* Manually limit tsd_state_t to a single byte. */
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typedef uint8_t tsd_state_t;
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/* The actual tsd. */
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struct tsd_s {
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/*
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* The contents should be treated as totally opaque outside the tsd
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* module. Access any thread-local state through the getters and
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* setters below.
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*/
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tsd_state_t state;
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#define O(n, t, nt) \
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t use_a_getter_or_setter_instead_##n;
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MALLOC_TSD
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#undef O
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};
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/*
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* Wrapper around tsd_t that makes it possible to avoid implicit conversion
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* between tsd_t and tsdn_t, where tsdn_t is "nullable" and has to be
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* explicitly converted to tsd_t, which is non-nullable.
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*/
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struct tsdn_s {
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tsd_t tsd;
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};
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#define TSDN_NULL ((tsdn_t *)0)
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JEMALLOC_ALWAYS_INLINE tsdn_t *
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tsd_tsdn(tsd_t *tsd) {
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return (tsdn_t *)tsd;
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}
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JEMALLOC_ALWAYS_INLINE bool
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tsdn_null(const tsdn_t *tsdn) {
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return tsdn == NULL;
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}
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JEMALLOC_ALWAYS_INLINE tsd_t *
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tsdn_tsd(tsdn_t *tsdn) {
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assert(!tsdn_null(tsdn));
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return &tsdn->tsd;
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}
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void *malloc_tsd_malloc(size_t size);
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void malloc_tsd_dalloc(void *wrapper);
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void malloc_tsd_cleanup_register(bool (*f)(void));
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tsd_t *malloc_tsd_boot0(void);
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void malloc_tsd_boot1(void);
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void tsd_cleanup(void *arg);
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tsd_t *tsd_fetch_slow(tsd_t *tsd, bool internal);
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void tsd_slow_update(tsd_t *tsd);
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/*
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* We put the platform-specific data declarations and inlines into their own
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* header files to avoid cluttering this file. They define tsd_boot0,
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* tsd_boot1, tsd_boot, tsd_booted_get, tsd_get_allocates, tsd_get, and tsd_set.
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*/
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#ifdef JEMALLOC_MALLOC_THREAD_CLEANUP
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#include "jemalloc/internal/tsd_malloc_thread_cleanup.h"
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#elif (defined(JEMALLOC_TLS))
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#include "jemalloc/internal/tsd_tls.h"
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#elif (defined(_WIN32))
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#include "jemalloc/internal/tsd_win.h"
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#else
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#include "jemalloc/internal/tsd_generic.h"
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#endif
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/*
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* tsd_foop_get_unsafe(tsd) returns a pointer to the thread-local instance of
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* foo. This omits some safety checks, and so can be used during tsd
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* initialization and cleanup.
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*/
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#define O(n, t, nt) \
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JEMALLOC_ALWAYS_INLINE t * \
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tsd_##n##p_get_unsafe(tsd_t *tsd) { \
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return &tsd->use_a_getter_or_setter_instead_##n; \
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}
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MALLOC_TSD
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#undef O
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/* tsd_foop_get(tsd) returns a pointer to the thread-local instance of foo. */
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#define O(n, t, nt) \
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JEMALLOC_ALWAYS_INLINE t * \
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tsd_##n##p_get(tsd_t *tsd) { \
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assert(tsd->state == tsd_state_nominal || \
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tsd->state == tsd_state_nominal_slow || \
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tsd->state == tsd_state_reincarnated || \
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tsd->state == tsd_state_minimal_initialized); \
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return tsd_##n##p_get_unsafe(tsd); \
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}
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MALLOC_TSD
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#undef O
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/*
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* tsdn_foop_get(tsdn) returns either the thread-local instance of foo (if tsdn
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* isn't NULL), or NULL (if tsdn is NULL), cast to the nullable pointer type.
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*/
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#define O(n, t, nt) \
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JEMALLOC_ALWAYS_INLINE nt * \
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tsdn_##n##p_get(tsdn_t *tsdn) { \
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if (tsdn_null(tsdn)) { \
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return NULL; \
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} \
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tsd_t *tsd = tsdn_tsd(tsdn); \
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return (nt *)tsd_##n##p_get(tsd); \
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}
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MALLOC_TSD
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#undef O
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/* tsd_foo_get(tsd) returns the value of the thread-local instance of foo. */
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#define O(n, t, nt) \
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JEMALLOC_ALWAYS_INLINE t \
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tsd_##n##_get(tsd_t *tsd) { \
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return *tsd_##n##p_get(tsd); \
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}
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MALLOC_TSD
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#undef O
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/* tsd_foo_set(tsd, val) updates the thread-local instance of foo to be val. */
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#define O(n, t, nt) \
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JEMALLOC_ALWAYS_INLINE void \
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tsd_##n##_set(tsd_t *tsd, t val) { \
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assert(tsd->state != tsd_state_reincarnated && \
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tsd->state != tsd_state_minimal_initialized); \
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*tsd_##n##p_get(tsd) = val; \
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}
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MALLOC_TSD
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#undef O
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JEMALLOC_ALWAYS_INLINE void
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tsd_assert_fast(tsd_t *tsd) {
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assert(!malloc_slow && tsd_tcache_enabled_get(tsd) &&
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tsd_reentrancy_level_get(tsd) == 0);
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}
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JEMALLOC_ALWAYS_INLINE bool
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tsd_fast(tsd_t *tsd) {
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bool fast = (tsd->state == tsd_state_nominal);
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if (fast) {
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tsd_assert_fast(tsd);
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}
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return fast;
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}
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JEMALLOC_ALWAYS_INLINE tsd_t *
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tsd_fetch_impl(bool init, bool minimal) {
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tsd_t *tsd = tsd_get(init);
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if (!init && tsd_get_allocates() && tsd == NULL) {
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return NULL;
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}
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assert(tsd != NULL);
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if (unlikely(tsd->state != tsd_state_nominal)) {
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return tsd_fetch_slow(tsd, minimal);
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}
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assert(tsd_fast(tsd));
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tsd_assert_fast(tsd);
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return tsd;
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}
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/* Get a minimal TSD that requires no cleanup. See comments in free(). */
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JEMALLOC_ALWAYS_INLINE tsd_t *
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tsd_fetch_min(void) {
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return tsd_fetch_impl(true, true);
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}
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/* For internal background threads use only. */
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JEMALLOC_ALWAYS_INLINE tsd_t *
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tsd_internal_fetch(void) {
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tsd_t *tsd = tsd_fetch_min();
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/* Use reincarnated state to prevent full initialization. */
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tsd->state = tsd_state_reincarnated;
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return tsd;
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}
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JEMALLOC_ALWAYS_INLINE tsd_t *
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tsd_fetch(void) {
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return tsd_fetch_impl(true, false);
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}
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static inline bool
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tsd_nominal(tsd_t *tsd) {
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return (tsd->state <= tsd_state_nominal_max);
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}
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JEMALLOC_ALWAYS_INLINE tsdn_t *
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tsdn_fetch(void) {
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if (!tsd_booted_get()) {
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return NULL;
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}
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return tsd_tsdn(tsd_fetch_impl(false, false));
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}
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JEMALLOC_ALWAYS_INLINE rtree_ctx_t *
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tsd_rtree_ctx(tsd_t *tsd) {
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return tsd_rtree_ctxp_get(tsd);
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}
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JEMALLOC_ALWAYS_INLINE rtree_ctx_t *
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tsdn_rtree_ctx(tsdn_t *tsdn, rtree_ctx_t *fallback) {
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/*
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* If tsd cannot be accessed, initialize the fallback rtree_ctx and
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* return a pointer to it.
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*/
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if (unlikely(tsdn_null(tsdn))) {
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rtree_ctx_data_init(fallback);
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return fallback;
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}
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return tsd_rtree_ctx(tsdn_tsd(tsdn));
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}
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#endif /* JEMALLOC_INTERNAL_TSD_H */
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