244 lines
9.0 KiB
C
244 lines
9.0 KiB
C
#ifndef JEMALLOC_INTERNAL_PA_H
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#define JEMALLOC_INTERNAL_PA_H
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#include "jemalloc/internal/base.h"
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#include "jemalloc/internal/decay.h"
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#include "jemalloc/internal/ecache.h"
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#include "jemalloc/internal/edata_cache.h"
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#include "jemalloc/internal/emap.h"
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#include "jemalloc/internal/hpa.h"
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#include "jemalloc/internal/lockedint.h"
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#include "jemalloc/internal/pac.h"
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#include "jemalloc/internal/pai.h"
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#include "jemalloc/internal/sec.h"
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/*
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* The page allocator; responsible for acquiring pages of memory for
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* allocations. It picks the implementation of the page allocator interface
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* (i.e. a pai_t) to handle a given page-level allocation request. For now, the
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* only such implementation is the PAC code ("page allocator classic"), but
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* others will be coming soon.
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*/
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typedef struct pa_central_s pa_central_t;
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struct pa_central_s {
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hpa_central_t hpa;
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};
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/*
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* The stats for a particular pa_shard. Because of the way the ctl module
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* handles stats epoch data collection (it has its own arena_stats, and merges
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* the stats from each arena into it), this needs to live in the arena_stats_t;
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* hence we define it here and let the pa_shard have a pointer (rather than the
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* more natural approach of just embedding it in the pa_shard itself).
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*
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* We follow the arena_stats_t approach of marking the derived fields. These
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* are the ones that are not maintained on their own; instead, their values are
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* derived during those stats merges.
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*/
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typedef struct pa_shard_stats_s pa_shard_stats_t;
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struct pa_shard_stats_s {
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/* Number of edata_t structs allocated by base, but not being used. */
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size_t edata_avail; /* Derived. */
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/*
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* Stats specific to the PAC. For now, these are the only stats that
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* exist, but there will eventually be other page allocators. Things
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* like edata_avail make sense in a cross-PA sense, but things like
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* npurges don't.
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*/
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pac_stats_t pac_stats;
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};
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/*
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* The local allocator handle. Keeps the state necessary to satisfy page-sized
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* allocations.
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*
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* The contents are mostly internal to the PA module. The key exception is that
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* arena decay code is allowed to grab pointers to the dirty and muzzy ecaches
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* decay_ts, for a couple of queries, passing them back to a PA function, or
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* acquiring decay.mtx and looking at decay.purging. The reasoning is that,
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* while PA decides what and how to purge, the arena code decides when and where
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* (e.g. on what thread). It's allowed to use the presence of another purger to
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* decide.
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* (The background thread code also touches some other decay internals, but
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* that's not fundamental; its' just an artifact of a partial refactoring, and
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* its accesses could be straightforwardly moved inside the decay module).
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*/
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typedef struct pa_shard_s pa_shard_t;
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struct pa_shard_s {
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/* The central PA this shard is associated with. */
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pa_central_t *central;
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/*
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* Number of pages in active extents.
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*
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* Synchronization: atomic.
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*/
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atomic_zu_t nactive;
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/*
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* Whether or not we should prefer the hugepage allocator. Atomic since
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* it may be concurrently modified by a thread setting extent hooks.
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* Note that we still may do HPA operations in this arena; if use_hpa is
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* changed from true to false, we'll free back to the hugepage allocator
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* for those allocations.
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*/
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atomic_b_t use_hpa;
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/*
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* If we never used the HPA to begin with, it wasn't initialized, and so
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* we shouldn't try to e.g. acquire its mutexes during fork. This
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* tracks that knowledge.
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*/
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bool ever_used_hpa;
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/* Allocates from a PAC. */
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pac_t pac;
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/*
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* We place a small extent cache in front of the HPA, since we intend
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* these configurations to use many fewer arenas, and therefore have a
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* higher risk of hot locks.
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*/
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sec_t hpa_sec;
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hpa_shard_t hpa_shard;
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/* The source of edata_t objects. */
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edata_cache_t edata_cache;
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unsigned ind;
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malloc_mutex_t *stats_mtx;
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pa_shard_stats_t *stats;
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/* The emap this shard is tied to. */
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emap_t *emap;
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/* The base from which we get the ehooks and allocate metadat. */
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base_t *base;
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};
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static inline bool
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pa_shard_dont_decay_muzzy(pa_shard_t *shard) {
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return ecache_npages_get(&shard->pac.ecache_muzzy) == 0 &&
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pac_decay_ms_get(&shard->pac, extent_state_muzzy) <= 0;
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}
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static inline ehooks_t *
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pa_shard_ehooks_get(pa_shard_t *shard) {
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return base_ehooks_get(shard->base);
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}
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/* Returns true on error. */
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bool pa_central_init(pa_central_t *central, base_t *base, bool hpa,
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hpa_hooks_t *hpa_hooks);
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/* Returns true on error. */
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bool pa_shard_init(tsdn_t *tsdn, pa_shard_t *shard, pa_central_t *central,
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emap_t *emap, base_t *base, unsigned ind, pa_shard_stats_t *stats,
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malloc_mutex_t *stats_mtx, nstime_t *cur_time, size_t oversize_threshold,
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ssize_t dirty_decay_ms, ssize_t muzzy_decay_ms);
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/*
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* This isn't exposed to users; we allow late enablement of the HPA shard so
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* that we can boot without worrying about the HPA, then turn it on in a0.
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*/
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bool pa_shard_enable_hpa(tsdn_t *tsdn, pa_shard_t *shard,
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const hpa_shard_opts_t *hpa_opts, const sec_opts_t *hpa_sec_opts);
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/*
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* We stop using the HPA when custom extent hooks are installed, but still
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* redirect deallocations to it.
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*/
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void pa_shard_disable_hpa(tsdn_t *tsdn, pa_shard_t *shard);
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/*
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* This does the PA-specific parts of arena reset (i.e. freeing all active
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* allocations).
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*/
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void pa_shard_reset(tsdn_t *tsdn, pa_shard_t *shard);
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/*
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* Destroy all the remaining retained extents. Should only be called after
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* decaying all active, dirty, and muzzy extents to the retained state, as the
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* last step in destroying the shard.
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*/
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void pa_shard_destroy(tsdn_t *tsdn, pa_shard_t *shard);
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/* Gets an edata for the given allocation. */
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edata_t *pa_alloc(tsdn_t *tsdn, pa_shard_t *shard, size_t size,
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size_t alignment, bool slab, szind_t szind, bool zero, bool guarded,
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bool *deferred_work_generated);
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/* Returns true on error, in which case nothing changed. */
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bool pa_expand(tsdn_t *tsdn, pa_shard_t *shard, edata_t *edata, size_t old_size,
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size_t new_size, szind_t szind, bool zero, bool *deferred_work_generated);
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/*
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* The same. Sets *generated_dirty to true if we produced new dirty pages, and
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* false otherwise.
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*/
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bool pa_shrink(tsdn_t *tsdn, pa_shard_t *shard, edata_t *edata, size_t old_size,
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size_t new_size, szind_t szind, bool *deferred_work_generated);
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/*
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* Frees the given edata back to the pa. Sets *generated_dirty if we produced
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* new dirty pages (well, we always set it for now; but this need not be the
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* case).
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* (We could make generated_dirty the return value of course, but this is more
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* consistent with the shrink pathway and our error codes here).
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*/
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void pa_dalloc(tsdn_t *tsdn, pa_shard_t *shard, edata_t *edata,
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bool *deferred_work_generated);
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bool pa_decay_ms_set(tsdn_t *tsdn, pa_shard_t *shard, extent_state_t state,
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ssize_t decay_ms, pac_purge_eagerness_t eagerness);
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ssize_t pa_decay_ms_get(pa_shard_t *shard, extent_state_t state);
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/*
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* Do deferred work on this PA shard.
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*
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* Morally, this should do both PAC decay and the HPA deferred work. For now,
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* though, the arena, background thread, and PAC modules are tightly interwoven
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* in a way that's tricky to extricate, so we only do the HPA-specific parts.
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*/
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void pa_shard_set_deferral_allowed(tsdn_t *tsdn, pa_shard_t *shard,
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bool deferral_allowed);
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void pa_shard_do_deferred_work(tsdn_t *tsdn, pa_shard_t *shard);
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void pa_shard_try_deferred_work(tsdn_t *tsdn, pa_shard_t *shard);
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uint64_t pa_shard_time_until_deferred_work(tsdn_t *tsdn, pa_shard_t *shard);
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/******************************************************************************/
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/*
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* Various bits of "boring" functionality that are still part of this module,
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* but that we relegate to pa_extra.c, to keep the core logic in pa.c as
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* readable as possible.
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*/
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/*
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* These fork phases are synchronized with the arena fork phase numbering to
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* make it easy to keep straight. That's why there's no prefork1.
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*/
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void pa_shard_prefork0(tsdn_t *tsdn, pa_shard_t *shard);
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void pa_shard_prefork2(tsdn_t *tsdn, pa_shard_t *shard);
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void pa_shard_prefork3(tsdn_t *tsdn, pa_shard_t *shard);
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void pa_shard_prefork4(tsdn_t *tsdn, pa_shard_t *shard);
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void pa_shard_prefork5(tsdn_t *tsdn, pa_shard_t *shard);
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void pa_shard_postfork_parent(tsdn_t *tsdn, pa_shard_t *shard);
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void pa_shard_postfork_child(tsdn_t *tsdn, pa_shard_t *shard);
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void pa_shard_basic_stats_merge(pa_shard_t *shard, size_t *nactive,
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size_t *ndirty, size_t *nmuzzy);
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void pa_shard_stats_merge(tsdn_t *tsdn, pa_shard_t *shard,
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pa_shard_stats_t *pa_shard_stats_out, pac_estats_t *estats_out,
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hpa_shard_stats_t *hpa_stats_out, sec_stats_t *sec_stats_out,
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size_t *resident);
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/*
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* Reads the PA-owned mutex stats into the output stats array, at the
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* appropriate positions. Morally, these stats should really live in
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* pa_shard_stats_t, but the indices are sort of baked into the various mutex
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* prof macros. This would be a good thing to do at some point.
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*/
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void pa_shard_mtx_stats_read(tsdn_t *tsdn, pa_shard_t *shard,
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mutex_prof_data_t mutex_prof_data[mutex_prof_num_arena_mutexes]);
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#endif /* JEMALLOC_INTERNAL_PA_H */
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