Purge dirty pages without arena->lock.
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@@ -95,14 +95,23 @@ typedef struct arena_s arena_t;
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/* Each element of the chunk map corresponds to one page within the chunk. */
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struct arena_chunk_map_s {
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/*
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* Linkage for run trees. There are two disjoint uses:
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*
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* 1) arena_t's runs_avail tree.
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* 2) arena_run_t conceptually uses this linkage for in-use non-full
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* runs, rather than directly embedding linkage.
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*/
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rb_node(arena_chunk_map_t) link;
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union {
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/*
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* Linkage for run trees. There are two disjoint uses:
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*
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* 1) arena_t's runs_avail tree.
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* 2) arena_run_t conceptually uses this linkage for in-use
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* non-full runs, rather than directly embedding linkage.
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*/
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rb_node(arena_chunk_map_t) rb_link;
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/*
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* List of runs currently in purgatory. arena_chunk_purge()
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* temporarily allocates runs that contain dirty pages while
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* purging, so that other threads cannot use the runs while the
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* purging thread is operating without the arena lock held.
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*/
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ql_elm(arena_chunk_map_t) ql_link;
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} u;
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#ifdef JEMALLOC_PROF
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/* Profile counters, used for large object runs. */
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@@ -311,6 +320,14 @@ struct arena_s {
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*/
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size_t ndirty;
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/*
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* Approximate number of pages being purged. It is possible for
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* multiple threads to purge dirty pages concurrently, and they use
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* npurgatory to indicate the total number of pages all threads are
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* attempting to purge.
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*/
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size_t npurgatory;
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/*
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* Size/address-ordered tree of this arena's available runs. This tree
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* is used for first-best-fit run allocation.
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