Re: [PATCH] oom: break after selecting process to kill

[Niv Yehezkel <executerx@gmail.com>]

On Fri, Sep 12, 2014 at 02:18:17PM +0200, Michal Hocko wrote:
> On Fri 12-09-14 04:23:29, Niv Yehezkel wrote:
> [...]
> > From 1e92f232e9367565d93629b54117b27b9bbfebda Mon Sep 17 00:00:00 2001
> > From: Niv Yehezkel <executerx@gmail.com>
> > Date: Fri, 12 Sep 2014 04:21:48 -0400
> > Subject: [PATCH] break after selecting process to kill
> > 
> > 
> 
> Now the justification please ;)
> 
> > Signed-off-by: Niv Yehezkel <executerx@gmail.com>
> > ---
> >  mm/oom_kill.c |    4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> > 
> > diff --git a/mm/oom_kill.c b/mm/oom_kill.c
> > index 1e11df8..3203578 100644
> > --- a/mm/oom_kill.c
> > +++ b/mm/oom_kill.c
> > @@ -315,7 +315,7 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
> >  		case OOM_SCAN_SELECT:
> >  			chosen = p;
> >  			chosen_points = ULONG_MAX;
> > -			/* fall through */
> > +			break;
> >  		case OOM_SCAN_CONTINUE:
> >  			continue;
> >  		case OOM_SCAN_ABORT:
> > @@ -324,6 +324,8 @@ static struct task_struct *select_bad_process(unsigned int *ppoints,
> >  		case OOM_SCAN_OK:
> >  			break;
> >  		};
> > +		if (chosen_points == ULONG_MAX)
> > +			break;
> >  		points = oom_badness(p, NULL, nodemask, totalpages);
> >  		if (!points || points < chosen_points)
> >  			continue;
> > -- 
> > 1.7.10.4
> > 
> 
> 
> -- 
> Michal Hocko
> SUSE Labs

As mentioned earlier, there's no need to keep iterating over all
running processes once the process with the highest score has been found.

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