Messages in this thread Patch in this message | | | From | Joonsoo Kim <> | Subject | [PATCH 1/3] slub: prefetch next freelist pointer in __slab_alloc() | Date | Sat, 23 Jun 2012 03:22:37 +0900 |
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Commit 0ad9500e16fe24aa55809a2b00e0d2d0e658fc71 ('slub: prefetch next freelist pointer in slab_alloc') add prefetch instruction to fast path of allocation.
Same benefit is also available in slow path of allocation, but it is not large portion of overall allocation. Nevertheless we could get some benifit from it, so prefetch next freelist pointer in __slab_alloc.
Signed-off-by: Joonsoo Kim <js1304@gmail.com>
diff --git a/mm/slub.c b/mm/slub.c index f96d8bc..92f1c0e 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -2248,6 +2248,7 @@ load_freelist: VM_BUG_ON(!c->page->frozen); c->freelist = get_freepointer(s, freelist); c->tid = next_tid(c->tid); + prefetch_freepointer(s, c->freelist); local_irq_restore(flags); return freelist; -- 1.7.9.5
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