Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932438Ab0HDDK7 (ORCPT ); Tue, 3 Aug 2010 23:10:59 -0400 Received: from mail-iw0-f174.google.com ([209.85.214.174]:62029 "EHLO mail-iw0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756860Ab0HDDK5 (ORCPT ); Tue, 3 Aug 2010 23:10:57 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=fJmIbIc7YFZJf+WEm5BWkyDDr/ttH7bX24n+fxkiZdph4JJCH8imz2FfnH+WkhD/e5 NFbS6rknSxu2bdBj1FgljlewkGN9gOO5o54fyIlsxUVpNrqlFMgtndBiW/wtE9UoHyZ4 rPU6OPL2tkTzXwYjHd/Emp1epJCXH3e0CkHf8= MIME-Version: 1.0 In-Reply-To: <20100804022148.GA5922@localhost> References: <20100802124734.GI2486@arachsys.com> <20100803033108.GA23117@arachsys.com> <20100803042835.GA17377@localhost> <20100803214945.GA2326@arachsys.com> <20100804022148.GA5922@localhost> Date: Wed, 4 Aug 2010 12:10:46 +0900 Message-ID: Subject: Re: Over-eager swapping From: Minchan Kim To: Wu Fengguang Cc: Chris Webb , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , KOSAKI Motohiro , Pekka Enberg Content-Type: multipart/mixed; boundary=000325575aeaa59f84048cf6c749 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 21890 Lines: 337 --000325575aeaa59f84048cf6c749 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable On Wed, Aug 4, 2010 at 11:21 AM, Wu Fengguang wrot= e: > Chris, > > Your slabinfo does contain many order 1-3 slab caches, this is a major so= urce > of high order allocations and hence lumpy reclaim. fork() is another. > > In another thread, Pekka Enberg offers a tip: > > =A0 =A0 =A0 =A0You can pass "slub_debug=3Do" as a kernel parameter to dis= able higher > =A0 =A0 =A0 =A0order allocations if you want to test things. > > Note that the parameter works on a CONFIG_SLUB_DEBUG=3Dy kernel. > > Thanks, > Fengguang He said following as. "After running swapoff -a, the machine is immediately much healthier. Even while the swap is still being reduced, load goes down and response times in virtual machines are much improved. Once the swap is completely gone, there are still several gigabytes of RAM left free which are used for buffers, an= d the virtual machines are no longer laggy because they are no longer swapped out. Running swapon -a again, the affected machine waits for about a minute with zero swap in use, before the amount of swap in use very rapidly increases to around 2GB and then continues to increase more steadily to 3GB= ." 1. His system works well without swap. 2. His system increase swap by 2G rapidly and more steadily to 3GB. So I thought it isn't likely to relate normal lumpy. Of course, without swap, lumpy can scan more file pages to make contiguous page frames. so it could work well, still. But I can't understand 2. Hmm, I have no idea. :( Off-Topic: Hi, Pekka. Document says. "Debugging options may require the minimum possible slab order to increase = as a result of storing the metadata (for example, caches with PAGE_SIZE object sizes). =A0This has a higher liklihood of resulting in slab allocation erro= rs in low memory situations or if there's high fragmentation of memory. =A0To switch off debugging for such caches by default, use =A0 =A0 =A0 =A0slub_debug=3DO" But when I tested it in my machine(2.6.34), =A0with slub_debug=3DO, it increase objsize and pagesperslab. Even it increase the number of slab(But I am not sure this part since it might not the same time from booting) What am I missing now? But SLAB seems to be consumed small pages than SLUB. Hmm. 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