From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail202.messagelabs.com (mail202.messagelabs.com [216.82.254.227]) by kanga.kvack.org (Postfix) with SMTP id 3233D6B004F for ; Tue, 11 Aug 2009 02:53:03 -0400 (EDT) Message-ID: <4A811545.5090209@redhat.com> Date: Tue, 11 Aug 2009 09:52:53 +0300 From: Avi Kivity MIME-Version: 1.0 Subject: Re: Page allocation failures in guest References: <20090713115158.0a4892b0@mjolnir.ossman.eu> <28c262360907130759w29c84117w635b21408090a06c@mail.gmail.com> <20090811083233.3b2be444@mjolnir.ossman.eu> In-Reply-To: <20090811083233.3b2be444@mjolnir.ossman.eu> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: owner-linux-mm@kvack.org To: Rusty Russell Cc: Pierre Ossman , Minchan Kim , kvm@vger.kernel.org, LKML , linux-mm@kvack.org, Wu Fengguang , KOSAKI Motohiro , Rik van Riel List-ID: On 08/11/2009 09:32 AM, Pierre Ossman wrote: > On Mon, 13 Jul 2009 23:59:52 +0900 > Minchan Kim wrote: > > >> On Mon, Jul 13, 2009 at 6:51 PM, Pierre Ossman wrote: >> >>> Jul 12 23:04:54 loki kernel: Active_anon:14065 active_file:87384 inactive_anon:37480 >>> Jul 12 23:04:54 loki kernel: inactive_file:95821 unevictable:4 dirty:8 writeback:0 unstable:0 >>> Jul 12 23:04:54 loki kernel: free:1344 slab:7113 mapped:4283 pagetables:5656 bounce:0 >>> Jul 12 23:04:54 loki kernel: Node 0 DMA free:3988kB min:24kB low:28kB high:36kB active_anon:0kB inactive_anon:0kB active_file:3532kB inactive_file:1032kB unevictable:0kB present:6840kB pages_scanned:0 all_un >>> >> I don't know why present is bigger than free + [in]active anon ? >> Who know this ? >> >> There are 258 pages in inactive file. >> Unfortunately, it seems we don't have any discardable pages. >> The reclaimer can't sync dirty pages to reclaim them, too. >> That's because we are going on GFP_ATOMIC as I mentioned. >> >> > > Any ideas here? Is the virtio net driver very GFP_ATOMIC happy so it > drains all those pages? And why is this triggered by a kernel upgrade > in the host? > > Avi? > > Rusty? >>> reclaimable? no >>> Jul 12 23:04:54 loki kernel: lowmem_reserve[]: 0 994 994 994 >>> Jul 12 23:04:54 loki kernel: Node 0 DMA32 free:1388kB min:4020kB low:5024kB high:6028kB active_anon:56260kB inactive_anon:149920kB active_file:346004kB inactive_file:382252kB unevictable:16kB present:1018016 >>> >> free : 1388KB min : 4020KB. In addtion, now GFP_HIGH. so calculation >> is as follow for zone_watermark_ok. >> >> 1388< (4020 / 2) >> >> So failed it in zone_watermark_ok. >> AFAIU, it's fairy OOM problem. >> >> > > I doesn't get out of it though, or at least the virtio net driver > wedges itself. > > Rgds > -- Do not meddle in the internals of kernels, for they are subtle and quick to panic. -- 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