Convert arena_maybe_purge() recursion to iteration.
This resolves #235.
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dc0610a714
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@ -316,6 +316,9 @@ struct arena_s {
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/* Minimum ratio (log base 2) of nactive:ndirty. */
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/* Minimum ratio (log base 2) of nactive:ndirty. */
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ssize_t lg_dirty_mult;
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ssize_t lg_dirty_mult;
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/* True if a thread is currently executing arena_purge(). */
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bool purging;
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/* Number of pages in active runs and huge regions. */
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/* Number of pages in active runs and huge regions. */
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size_t nactive;
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size_t nactive;
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36
src/arena.c
36
src/arena.c
@ -1143,21 +1143,29 @@ arena_lg_dirty_mult_set(arena_t *arena, ssize_t lg_dirty_mult)
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void
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void
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arena_maybe_purge(arena_t *arena)
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arena_maybe_purge(arena_t *arena)
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{
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{
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size_t threshold;
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/* Don't purge if the option is disabled. */
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/* Don't purge if the option is disabled. */
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if (arena->lg_dirty_mult < 0)
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if (arena->lg_dirty_mult < 0)
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return;
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return;
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threshold = (arena->nactive >> arena->lg_dirty_mult);
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/* Don't recursively purge. */
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threshold = threshold < chunk_npages ? chunk_npages : threshold;
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if (arena->purging)
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/*
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* Don't purge unless the number of purgeable pages exceeds the
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* threshold.
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*/
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if (arena->ndirty <= threshold)
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return;
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return;
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/*
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arena_purge(arena, false);
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* Iterate, since preventing recursive purging could otherwise leave too
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* many dirty pages.
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*/
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while (true) {
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size_t threshold = (arena->nactive >> arena->lg_dirty_mult);
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if (threshold < chunk_npages)
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threshold = chunk_npages;
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/*
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* Don't purge unless the number of purgeable pages exceeds the
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* threshold.
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*/
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if (arena->ndirty <= threshold)
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return;
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arena_purge(arena, false);
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}
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}
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}
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static size_t
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static size_t
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@ -1411,6 +1419,8 @@ arena_purge(arena_t *arena, bool all)
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arena_runs_dirty_link_t purge_runs_sentinel;
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arena_runs_dirty_link_t purge_runs_sentinel;
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extent_node_t purge_chunks_sentinel;
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extent_node_t purge_chunks_sentinel;
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arena->purging = true;
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/*
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/*
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* Calls to arena_dirty_count() are disabled even for debug builds
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* Calls to arena_dirty_count() are disabled even for debug builds
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* because overhead grows nonlinearly as memory usage increases.
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* because overhead grows nonlinearly as memory usage increases.
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@ -1436,6 +1446,8 @@ arena_purge(arena_t *arena, bool all)
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assert(npurged == npurgeable);
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assert(npurged == npurgeable);
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arena_unstash_purged(arena, &purge_runs_sentinel,
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arena_unstash_purged(arena, &purge_runs_sentinel,
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&purge_chunks_sentinel);
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&purge_chunks_sentinel);
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arena->purging = false;
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}
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}
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void
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void
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@ -2053,7 +2065,8 @@ arena_malloc_large(arena_t *arena, size_t size, bool zero)
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* for 4 KiB pages and 64-byte cachelines.
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* for 4 KiB pages and 64-byte cachelines.
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*/
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*/
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prng64(r, LG_PAGE - LG_CACHELINE, arena->offset_state,
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prng64(r, LG_PAGE - LG_CACHELINE, arena->offset_state,
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UINT64_C(6364136223846793009), UINT64_C(1442695040888963409));
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UINT64_C(6364136223846793009),
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UINT64_C(1442695040888963409));
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random_offset = ((uintptr_t)r) << LG_CACHELINE;
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random_offset = ((uintptr_t)r) << LG_CACHELINE;
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} else
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} else
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random_offset = 0;
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random_offset = 0;
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@ -2873,6 +2886,7 @@ arena_new(unsigned ind)
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arena->spare = NULL;
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arena->spare = NULL;
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arena->lg_dirty_mult = arena_lg_dirty_mult_default_get();
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arena->lg_dirty_mult = arena_lg_dirty_mult_default_get();
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arena->purging = false;
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arena->nactive = 0;
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arena->nactive = 0;
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arena->ndirty = 0;
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arena->ndirty = 0;
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