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Date: Tue, 11 Aug 2009 09:52:53 +0300 From: Avi Kivity <avi@...hat.com> To: Rusty Russell <rusty@...tcorp.com.au> CC: Pierre Ossman <drzeus-list@...eus.cx>, Minchan Kim <minchan.kim@...il.com>, kvm@...r.kernel.org, LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org, Wu Fengguang <fengguang.wu@...el.com>, KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Rik van Riel <riel@...hat.com> Subject: Re: Page allocation failures in guest On 08/11/2009 09:32 AM, Pierre Ossman wrote: > On Mon, 13 Jul 2009 23:59:52 +0900 > Minchan Kim<minchan.kim@...il.com> wrote: > > >> On Mon, Jul 13, 2009 at 6:51 PM, Pierre Ossman<drzeus-list@...eus.cx> 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 from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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