linux-kernel - Re: [BUGFIX][PATCH] oom-kill: fix NUMA consraint check with nodemask v4.1

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Date:	Wed, 11 Nov 2009 15:20:04 +0900
From:	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Lameter <cl@...ux-foundation.org>
Subject: Re: [BUGFIX][PATCH] oom-kill: fix NUMA consraint check with
 nodemask v4.1

On Tue, 10 Nov 2009 21:58:31 -0800 (PST)
David Rientjes <rientjes@...gle.com> wrote:

> On Wed, 11 Nov 2009, KAMEZAWA Hiroyuki wrote:
> 
> > Index: mm-test-kernel/drivers/char/sysrq.c
> > ===================================================================
> > --- mm-test-kernel.orig/drivers/char/sysrq.c
> > +++ mm-test-kernel/drivers/char/sysrq.c
> > @@ -339,7 +339,7 @@ static struct sysrq_key_op sysrq_term_op
> >  
> >  static void moom_callback(struct work_struct *ignored)
> >  {
> > -	out_of_memory(node_zonelist(0, GFP_KERNEL), GFP_KERNEL, 0);
> > +	out_of_memory(node_zonelist(0, GFP_KERNEL), GFP_KERNEL, 0, NULL);
> >  }
> >  
> >  static DECLARE_WORK(moom_work, moom_callback);
> > Index: mm-test-kernel/mm/oom_kill.c
> > ===================================================================
> > --- mm-test-kernel.orig/mm/oom_kill.c
> > +++ mm-test-kernel/mm/oom_kill.c
> > @@ -196,27 +196,47 @@ unsigned long badness(struct task_struct
> >  /*
> >   * Determine the type of allocation constraint.
> >   */
> > -static inline enum oom_constraint constrained_alloc(struct zonelist *zonelist,
> > -						    gfp_t gfp_mask)
> > -{
> >  #ifdef CONFIG_NUMA
> > +static enum oom_constraint constrained_alloc(struct zonelist *zonelist,
> > +				    gfp_t gfp_mask, nodemask_t *nodemask)
> > +{
> >  	struct zone *zone;
> >  	struct zoneref *z;
> >  	enum zone_type high_zoneidx = gfp_zone(gfp_mask);
> > -	nodemask_t nodes = node_states[N_HIGH_MEMORY];
> > +	int ret = CONSTRAINT_NONE;
> >  
> > -	for_each_zone_zonelist(zone, z, zonelist, high_zoneidx)
> > -		if (cpuset_zone_allowed_softwall(zone, gfp_mask))
> > -			node_clear(zone_to_nid(zone), nodes);
> > -		else
> > -			return CONSTRAINT_CPUSET;
> > +	/*
> > +	 * Reach here only when __GFP_NOFAIL is used. So, we should avoid
> > + 	 * to kill current.We have to random task kill in this case.
> > + 	 * Hopefully, CONSTRAINT_THISNODE...but no way to handle it, now.
> > + 	 */
> > +	if (gfp_mask & __GPF_THISNODE)
> > +		return ret;
> >  
> 
> That shouldn't compile.
> 
Why ?

Thanks,
-Kame

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