PA -> PAC: Move in destruction functions.
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@ -113,7 +113,7 @@ void pa_shard_reset(pa_shard_t *shard);
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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_retained(tsdn_t *tsdn, pa_shard_t *shard);
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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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@ -153,4 +153,8 @@ bool pac_retain_grow_limit_get_set(tsdn_t *tsdn, pac_t *pac, size_t *old_limit,
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bool pac_decay_ms_set(tsdn_t *tsdn, pac_t *pac, extent_state_t state,
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ssize_t decay_ms, pac_purge_eagerness_t eagerness);
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ssize_t pac_decay_ms_get(pac_t *pac, extent_state_t state);
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void pac_reset(tsdn_t *tsdn, pac_t *pac);
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void pac_destroy(tsdn_t *tsdn, pac_t *pac);
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#endif /* JEMALLOC_INTERNAL_PAC_H */
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@ -645,7 +645,7 @@ arena_destroy(tsd_t *tsd, arena_t *arena) {
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* extents, so only retained extents may remain and it's safe to call
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* pa_shard_destroy_retained.
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*/
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pa_shard_destroy_retained(tsd_tsdn(tsd), &arena->pa_shard);
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pa_shard_destroy(tsd_tsdn(tsd), &arena->pa_shard);
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/*
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* Remove the arena pointer from the arenas array. We rely on the fact
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20
src/pa.c
20
src/pa.c
@ -58,24 +58,8 @@ pa_shard_reset(pa_shard_t *shard) {
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}
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void
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pa_shard_destroy_retained(tsdn_t *tsdn, pa_shard_t *shard) {
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assert(ecache_npages_get(&shard->pac.ecache_dirty) == 0);
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assert(ecache_npages_get(&shard->pac.ecache_muzzy) == 0);
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/*
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* Iterate over the retained extents and destroy them. This gives the
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* extent allocator underlying the extent hooks an opportunity to unmap
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* all retained memory without having to keep its own metadata
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* structures. In practice, virtual memory for dss-allocated extents is
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* leaked here, so best practice is to avoid dss for arenas to be
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* destroyed, or provide custom extent hooks that track retained
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* dss-based extents for later reuse.
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*/
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ehooks_t *ehooks = pa_shard_ehooks_get(shard);
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edata_t *edata;
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while ((edata = ecache_evict(tsdn, &shard->pac, ehooks,
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&shard->pac.ecache_retained, 0)) != NULL) {
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extent_destroy_wrapper(tsdn, &shard->pac, ehooks, edata);
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}
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pa_shard_destroy(tsdn_t *tsdn, pa_shard_t *shard) {
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pac_destroy(tsdn, &shard->pac);
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}
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static inline bool
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31
src/pac.c
31
src/pac.c
@ -321,3 +321,34 @@ pac_decay_ms_get(pac_t *pac, extent_state_t state) {
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pac_decay_data_get(pac, state, &decay, &decay_stats, &ecache);
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return decay_ms_read(decay);
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}
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void
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pac_reset(tsdn_t *tsdn, pac_t *pac) {
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/*
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* No-op for now; purging is still done at the arena-level. It should
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* get moved in here, though.
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*/
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(void)tsdn;
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(void)pac;
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}
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void
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pac_destroy(tsdn_t *tsdn, pac_t *pac) {
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assert(ecache_npages_get(&pac->ecache_dirty) == 0);
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assert(ecache_npages_get(&pac->ecache_muzzy) == 0);
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/*
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* Iterate over the retained extents and destroy them. This gives the
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* extent allocator underlying the extent hooks an opportunity to unmap
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* all retained memory without having to keep its own metadata
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* structures. In practice, virtual memory for dss-allocated extents is
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* leaked here, so best practice is to avoid dss for arenas to be
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* destroyed, or provide custom extent hooks that track retained
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* dss-based extents for later reuse.
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*/
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ehooks_t *ehooks = pac_ehooks_get(pac);
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edata_t *edata;
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while ((edata = ecache_evict(tsdn, pac, ehooks,
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&pac->ecache_retained, 0)) != NULL) {
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extent_destroy_wrapper(tsdn, pac, ehooks, edata);
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}
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}
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