From mboxrd@z Thu Jan 1 00:00:00 1970 Date: Sat, 24 Feb 2007 14:28:35 +0900 From: KAMEZAWA Hiroyuki Subject: Re: SLUB: The unqueued Slab allocator Message-Id: <20070224142835.4c7a3207.kamezawa.hiroyu@jp.fujitsu.com> In-Reply-To: References: Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org Return-Path: To: Christoph Lameter Cc: andi@firstfloor.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org List-ID: On Thu, 22 Feb 2007 10:42:23 -0800 (PST) Christoph Lameter wrote: > > > G. Slab merging > > > > > > We often have slab caches with similar parameters. SLUB detects those > > > on bootup and merges them into the corresponding general caches. This > > > leads to more effective memory use. > > > > Did you do any tests on what that does to long term memory fragmentation? > > It is against the "object of same type have similar livetime and should > > be clustered together" theory at least. > > I have done no tests in that regard and we would have to assess the impact > that the merging has to overall system behavior. > >>From a viewpoint of a crash dump user, this merging will make crash dump investigation very very very difficult. So please avoid this merging if the benefit is nog big. -Kame -- 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