Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758281Ab2JSTry (ORCPT ); Fri, 19 Oct 2012 15:47:54 -0400 Received: from a193-30.smtp-out.amazonses.com ([199.255.193.30]:38650 "EHLO a193-30.smtp-out.amazonses.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754950Ab2JSTrx (ORCPT ); Fri, 19 Oct 2012 15:47:53 -0400 Date: Fri, 19 Oct 2012 19:47:51 +0000 From: Christoph Lameter X-X-Sender: cl@gentwo.org To: Glauber Costa cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, Mel Gorman , Tejun Heo , Andrew Morton , Michal Hocko , Johannes Weiner , kamezawa.hiroyu@jp.fujitsu.com, David Rientjes , Pekka Enberg , devel@openvz.org, Pekka Enberg , Suleiman Souhlal Subject: Re: [PATCH v5 14/18] memcg/sl[au]b: shrink dead caches In-Reply-To: <1350656442-1523-15-git-send-email-glommer@parallels.com> Message-ID: <0000013a7a9144d1-de184c46-2a7d-4e6c-8606-927cc1f48969-000000@email.amazonses.com> References: <1350656442-1523-1-git-send-email-glommer@parallels.com> <1350656442-1523-15-git-send-email-glommer@parallels.com> User-Agent: Alpine 2.02 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII X-SES-Outgoing: 199.255.193.30 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 763 Lines: 18 On Fri, 19 Oct 2012, Glauber Costa wrote: > An unlikely branch is used to make sure this case does not affect > performance in the usual slab_free path. > > The slab allocator has a time based reaper that would eventually get rid > of the objects, but we can also call it explicitly, since dead caches > are not a likely event. This is also something that could be done from slab_common since all allocators have kmem_cache_shrink and kmem_cache_shrink can be used to drain the caches and free up empty slab pages. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/