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Perform delayed coalescing prior to purging.

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Rather than purging uncoalesced extents, perform just enough incremental
coalescing to purge only fully coalesced extents.  In the absence of
cached extent reuse, the immediate versus delayed incremental purging
algorithms result in the same purge order.

This resolves #655.
This commit is contained in:
Jason Evans
2017-03-02 18:04:35 -08:00
parent 8547ee11c3
commit e201e24904
6 changed files with 152 additions and 50 deletions
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5
include/jemalloc/internal/extent_externs.h
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@@ -18,10 +18,11 @@ size_t extent_size_quantize_ceil(size_t size);
ph_proto(, extent_heap_, extent_heap_t, extent_t)
bool extents_init(tsdn_t *tsdn, extents_t *extents, extent_state_t state,
bool try_coalesce);
bool delay_coalesce);
extent_state_t extents_state_get(const extents_t *extents);
size_t extents_npages_get(extents_t *extents);
extent_t *extents_evict(tsdn_t *tsdn, extents_t *extents, size_t npages_min);
extent_t *extents_evict(tsdn_t *tsdn, arena_t *arena,
extent_hooks_t **r_extent_hooks, extents_t *extents, size_t npages_min);
void extents_prefork(tsdn_t *tsdn, extents_t *extents);
void extents_postfork_parent(tsdn_t *tsdn, extents_t *extents);
void extents_postfork_child(tsdn_t *tsdn, extents_t *extents);