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Generalize chunk management hooks.

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Add the "arena.<i>.chunk_hooks" mallctl, which replaces and expands on
the "arena.<i>.chunk.{alloc,dalloc,purge}" mallctls.  The chunk hooks
allow control over chunk allocation/deallocation, decommit/commit,
purging, and splitting/merging, such that the application can rely on
jemalloc's internal chunk caching and retaining functionality, yet
implement a variety of chunk management mechanisms and policies.

Merge the chunks_[sz]ad_{mmap,dss} red-black trees into
chunks_[sz]ad_retained.  This slightly reduces how hard jemalloc tries
to honor the dss precedence setting; prior to this change the precedence
setting was also consulted when recycling chunks.

Fix chunk purging.  Don't purge chunks in arena_purge_stashed(); instead
deallocate them in arena_unstash_purged(), so that the dirty memory
linkage remains valid until after the last time it is used.

This resolves #176 and #201.
This commit is contained in:
Jason Evans
2015-07-28 11:28:19 -04:00
parent d059b9d6a1
commit b49a334a64
20 changed files with 1021 additions and 552 deletions
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4
src/base.c
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@@ -66,7 +66,7 @@ base_chunk_alloc(size_t minsize)
base_resident += PAGE_CEILING(nsize);
}
}
extent_node_init(node, NULL, addr, csize, true);
extent_node_init(node, NULL, addr, csize, true, true);
return (node);
}
@@ -90,7 +90,7 @@ base_alloc(size_t size)
csize = CACHELINE_CEILING(size);
usize = s2u(csize);
extent_node_init(&key, NULL, NULL, usize, false);
extent_node_init(&key, NULL, NULL, usize, true, false);
malloc_mutex_lock(&base_mtx);
node = extent_tree_szad_nsearch(&base_avail_szad, &key);
if (node != NULL) {