From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx192.postini.com [74.125.245.192]) by kanga.kvack.org (Postfix) with SMTP id AF6F06B006C for ; Thu, 16 Aug 2012 13:08:24 -0400 (EDT) Date: Thu, 16 Aug 2012 17:08:23 +0000 From: Christoph Lameter Subject: Re: [PATCH] slub: try to get cpu partial slab even if we get enough objects for cpu freelist In-Reply-To: Message-ID: <00000139306844c8-bb717c88-ca56-48b3-9b8f-9186053359d3-000000@email.amazonses.com> References: <1345045084-7292-1-git-send-email-js1304@gmail.com> <000001392af5ab4e-41dbbbe4-5808-484b-900a-6f4eba102376-000000@email.amazonses.com> <000001392b579d4f-bb5ccaf5-1a2c-472c-9b76-05ec86297706-000000@email.amazonses.com> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-linux-mm@kvack.org List-ID: To: JoonSoo Kim Cc: Pekka Enberg , linux-kernel@vger.kernel.org, linux-mm@kvack.org, David Rientjes On Thu, 16 Aug 2012, JoonSoo Kim wrote: > But, if you prefer that s->cpu_partial is for both cpu slab and cpu > partial slab, > get_partial_node() needs an another minor fix. > We should add number of objects in cpu slab when we refill cpu partial slab. > Following is my suggestion. > > @@ -1546,7 +1546,7 @@ static void *get_partial_node(struct kmem_cache *s, > spin_lock(&n->list_lock); > list_for_each_entry_safe(page, page2, &n->partial, lru) { > void *t = acquire_slab(s, n, page, object == NULL); > - int available; > + int available, nr = 0; > > if (!t) > break; > @@ -1557,10 +1557,10 @@ static void *get_partial_node(struct kmem_cache *s, > object = t; > available = page->objects - page->inuse; > } else { > - available = put_cpu_partial(s, page, 0); > + nr = put_cpu_partial(s, page, 0); > stat(s, CPU_PARTIAL_NODE); > } > - if (kmem_cache_debug(s) || available > s->cpu_partial / 2) > + if (kmem_cache_debug(s) || (available + nr) > > s->cpu_partial / 2) > break; > > } > > If you agree with this suggestion, I send a patch for this. What difference does this patch make? At the end of the day you need the total number of objects available in the partial slabs and the cpu slab for comparison. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org