linux-kernel - Re: [stable] OOM-killer invoked but why ?

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Message-ID: <20080205223736.GA7404@kroah.com>
Date:	Tue, 5 Feb 2008 14:37:36 -0800
From:	Greg KH <greg@...ah.com>
To:	Christoph Lameter <clameter@....com>
Cc:	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	r31dmaeu@...312b.rz.unibw-muenchen.de, stable@...nel.org
Subject: Re: [stable] OOM-killer invoked but why ?

On Tue, Feb 05, 2008 at 02:13:12PM -0800, Christoph Lameter wrote:
> On Tue, 5 Feb 2008, Greg KH wrote:
> 
> > > > commit 96990a4ae979df9e235d01097d6175759331e88c
> > > > Author: Christoph Lameter <clameter@....com>
> > > > Date:   Mon Jan 14 00:55:14 2008 -0800
> > > > 
> > > >     quicklists: Only consider memory that can be used with GFP_KERNEL
> > > >     
> > > >     Quicklists calculates the size of the quicklists based on the number of
> > > >     free pages.  This must be the number of free pages that can be allocated
> > > >     with GFP_KERNEL.  node_page_state() includes the pages in ZONE_HIGHMEM and
> > > >     ZONE_MOVABLE which may lead the quicklists to become too large causing OOM.
> > > >     
> > > >     Signed-off-by: Christoph Lameter <clameter@....com>
> > > >     Tested-by: Dhaval Giani <dhaval@...ux.vnet.ibm.com>
> > > >     Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> > > >     Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
> > > > 
> > > > diff --git a/mm/quicklist.c b/mm/quicklist.c
> > > > index ae8189c..3f703f7 100644
> > > > --- a/mm/quicklist.c
> > > > +++ b/mm/quicklist.c
> > > > @@ -26,9 +26,17 @@ DEFINE_PER_CPU(struct quicklist, quicklist)[CONFIG_NR_QUICK];
> > > >  static unsigned long max_pages(unsigned long min_pages)
> > > >  {
> > > >  	unsigned long node_free_pages, max;
> > > > +	struct zone *zones = NODE_DATA(numa_node_id())->node_zones;
> > > > +
> > > > +	node_free_pages =
> > > > +#ifdef CONFIG_ZONE_DMA
> > > > +		zone_page_state(&zones[ZONE_DMA], NR_FREE_PAGES) +
> > > > +#endif
> > > > +#ifdef CONFIG_ZONE_DMA32
> > > > +		zone_page_state(&zones[ZONE_DMA32], NR_FREE_PAGES) +
> > > > +#endif
> > > > +		zone_page_state(&zones[ZONE_NORMAL], NR_FREE_PAGES);
> > > > 
> > > > -	node_free_pages = node_page_state(numa_node_id(),
> > > > -			NR_FREE_PAGES);
> > > >  	max = node_free_pages / FRACTION_OF_NODE_MEM;
> > > >  	return max(max, min_pages);
> > > >  }
> > > > 
> > > > 
> > > > I note that this didn't have the stable@...nel.org cc.  Christoph, did we
> > > > deliberately decide not to backport?
> > > > 
> > > 
> > > According to
> > > http://archive.netbsd.se/?ml=linux-stable-commits&a=2008-01&m=6134301 ,
> > > its been added to the stable tree. I remember asking Greg to add it.
> > 
> > And then Christoph told me to remove it...
> 
> No I asked you to add this patch and remove the earlier patch that 
> tinkered around with tlb flushing.

Argh, I'm too confused...

As long as everyone is happy with what is currently queued up for
.22-stable and .23-stable, I'll just shut up now and get on releasing
them :)

thanks,

greg k-h
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