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

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Date:	Tue, 5 Feb 2008 14:13:12 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Greg KH <greg@...ah.com>
cc:	Dhaval Giani <dhaval@...ux.vnet.ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>, stable@...nel.org,
	linux-kernel@...r.kernel.org, r31dmaeu@...312b.rz.unibw-muenchen.de
Subject: Re: [stable] OOM-killer invoked but why ?

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.

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