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psset: Purge empty slabs first.

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These are particularly good candidates for purging (listed in the diff).
This commit is contained in:
David Goldblatt 2021-06-03 16:21:29 -07:00 • committed by David Goldblatt
parent 41fd56605e
commit 47d8a7e6b0
3 changed files with 143 additions and 7 deletions
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9
include/jemalloc/internal/psset.h
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@ -25,6 +25,9 @@
* index 2*pszind), and one for the non-hugified hpdatas (at index 2*pszind +
* 1). This lets us implement a preference for purging non-hugified hpdatas
* among similarly-dirty ones.
* We reserve the last two indices for empty slabs, in that case purging
* hugified ones (which are definitionally all waste) before non-hugified ones
* (i.e. reversing the order).
*/
#define PSSET_NPURGE_LISTS (2 * PSSET_NPSIZES)
@ -78,7 +81,11 @@ struct psset_s {
* allocations.
*/
hpdata_empty_list_t empty;
/* Slabs which are available to be purged, ordered by purge level. */
/*
* Slabs which are available to be purged, ordered by how much we want
* to purge them (with later indices indicating slabs we want to purge
* more).
*/
hpdata_purge_list_t to_purge[PSSET_NPURGE_LISTS];
/* Bitmap for which set bits correspond to non-empty purge lists. */
fb_group_t purge_bitmap[FB_NGROUPS(PSSET_NPURGE_LISTS)];