Re: [Bug #14141] order 2 page allocation failures (generic)

[Mel Gorman]

On Mon, Oct 19, 2009 at 04:16:36PM +0200, Tobias Oetiker wrote:
> Hi Mel,
> 
> Today Mel Gorman wrote:
> 
> > On Mon, Oct 19, 2009 at 03:40:05PM +0200, Tobias Oetiker wrote:
> > > Hi Mel,
> > >
> > > Today Mel Gorman wrote:
> > >
> > > > On Mon, Oct 19, 2009 at 11:49:08AM +0200, Tobi Oetiker wrote:
> > > > > Today Frans Pop wrote:
> > > > >
> > > > > >
> > > > > > I'm starting to think that this commit may not be directly related to high
> > > > > > order allocation failures. The fact that I'm seeing SKB allocation
> > > > > > failures earlier because of this commit could be just a side effect.
> > > > > > It could be that instead the main impact of this commit is on encrypted
> > > > > > file system and/or encrypted swap (kcryptd).
> > > > > >
> > > > > > Besides mm the commit also touches dm-crypt (and nfs/write.c, but as I'm
> > > > > > only reading from NFS that's unlikely).
> > > > >
> > > > > I have updated a fileserver to 2.6.31 today and I see page
> > > > > allocation failures from several parts of the system ... mostly nfs though ... (it is a nfs server).
> > > > > So I guess the problem must be quite generic:
> > > > >
> > > > >
> > > > > Oct 19 07:10:02 johan kernel: [23565.684110] swapper: page allocation failure. order:5, mode:0x4020 [kern.warning]
> > > > > Oct 19 07:10:02 johan kernel: [23565.684118] Pid: 0, comm: swapper Not tainted 2.6.31-02063104-generic #02063104 [kern.warning]
> > > > > Oct 19 07:10:02 johan kernel: [23565.684121] Call Trace: [kern.warning]
> > > > > Oct 19 07:10:02 johan kernel: [23565.684124]  <IRQ>  [<ffffffff810da5a2>] __alloc_pages_slowpath+0x3b2/0x4c0 [kern.warning]
> > > > >
> > > >
> > > > What's the rest of the stack trace? I'm wondering where a large number
> > > > of order-5 GFP_ATOMIC allocations are coming from. It seems different to
> > > > the e100 problem where there is one GFP_ATOMIC allocation while the
> > > > firmware is being loaded.
> > >
> > > Oct 19 07:10:02 johan kernel: [23565.684110] swapper: page allocation failure. order:5, mode:0x4020 [kern.warning]
> > > Oct 19 07:10:02 johan kernel: [23565.684118] Pid: 0, comm: swapper Not tainted 2.6.31-02063104-generic #02063104 [kern.warning]
> > > Oct 19 07:10:02 johan kernel: [23565.684121] Call Trace: [kern.warning]
> > > Oct 19 07:10:02 johan kernel: [23565.684124]  <IRQ>  [<ffffffff810da5a2>] __alloc_pages_slowpath+0x3b2/0x4c0 [kern.warning]
> > > Oct 19 07:10:02 johan kernel: [23565.684157]  [<ffffffff810da7e5>] __alloc_pages_nodemask+0x135/0x140 [kern.warning]
> > > Oct 19 07:10:02 johan kernel: [23565.684164]  [<ffffffff815065b4>] ? _spin_unlock_bh+0x14/0x20 [kern.warning]
> > > Oct 19 07:10:02 johan kernel: [23565.684170]  [<ffffffff8110b368>] kmalloc_large_node+0x68/0xc0 [kern.warning]
> > > Oct 19 07:10:02 johan kernel: [23565.684175]  [<ffffffff8110f15a>] __kmalloc_node_track_caller+0x11a/0x180 [kern.warning]
> > > Oct 19 07:10:02 johan kernel: [23565.684181]  [<ffffffff8140ffd2>] ? skb_copy+0x32/0xa0 [kern.warning]
> > > Oct 19 07:10:02 johan kernel: [23565.684185]  [<ffffffff8140d8b6>] __alloc_skb+0x76/0x180 [kern.warning]
> > > Oct 19 07:10:02 johan kernel: [23565.684205]  [<ffffffff8140ffd2>] skb_copy+0x32/0xa0 [kern.warning]
> > > Oct 19 07:10:02 johan kernel: [23565.684221]  [<ffffffffa050f33c>] vboxNetFltLinuxPacketHandler+0x5c/0xd0 [vboxnetflt] [kern.warning]
> >
> > Is the MTU set very high between the host and virtualised machine?
> >
> > Can you test please with the patch at http://lkml.org/lkml/2009/10/16/89
> > applied and with commits 373c0a7e and 8aa7e847 reverted please?
> 
> if you can send me a consolidated patch which does apply to
> 2.6.31.4 I will be glad to try ...
> 

Sure

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