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Disable coalescing of cached extents.

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Extent splitting and coalescing is a major component of large allocation
overhead, and disabling coalescing of cached extents provides a simple
and effective hysteresis mechanism.  Once two-phase purging is
implemented, it will probably make sense to leave coalescing disabled
for the first phase, but coalesce during the second phase.
This commit is contained in:
Jason Evans 2017-02-12 23:18:57 -08:00
parent c1ebfaa673
commit 2dfc5b5aac
4 changed files with 43 additions and 24 deletions
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3
include/jemalloc/internal/extent_externs.h
View file

@ -21,7 +21,8 @@ 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 extents_init(tsdn_t *tsdn, extents_t *extents, extent_state_t state,
bool try_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);

3
include/jemalloc/internal/extent_structs.h
View file

@ -115,6 +115,9 @@ struct extents_s {
/* All stored extents must be in the same state. */
extent_state_t state;
/* If true, try to coalesce during extent deallocation. */
bool try_coalesce;
};
#endif /* JEMALLOC_INTERNAL_EXTENT_STRUCTS_H */