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From: Michal Hocko <mhocko@suse.com>
To: Stanislaw Gruszka <sgruszka@redhat.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>,
	akpm@linux-foundation.org, linux-mm@kvack.org,
	"Rafael J. Wysocki" <rjw@sisk.pl>,
	Andrea Arcangeli <aarcange@redhat.com>,
	Christoph Lameter <cl@linux-foundation.org>,
	Mel Gorman <mgorman@suse.de>,
	Pekka Enberg <penberg@cs.helsinki.fi>
Subject: Re: [PATCH] mm, page_alloc: Remove debug_guardpage_minorder() test in warn_alloc().
Date: Wed, 12 Apr 2017 14:12:32 +0200	[thread overview]
Message-ID: <20170412121232.GD7157@dhcp22.suse.cz> (raw)
In-Reply-To: <20170412114754.GA15135@redhat.com>

On Wed 12-04-17 13:48:16, Stanislaw Gruszka wrote:
> On Wed, Apr 12, 2017 at 01:35:28PM +0200, Michal Hocko wrote:
> > OK, I see. That is a rather weird feature and the naming is more than
> > surprising. But put that aside. Then it means that the check should be
> > pulled out to 
> > diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> > index 6632256ef170..1e5f3b5cdb87 100644
> > --- a/mm/page_alloc.c
> > +++ b/mm/page_alloc.c
> > @@ -3941,7 +3941,8 @@ __alloc_pages_slowpath(gfp_t gfp_mask, unsigned int order,
> >  		goto retry;
> >  	}
> >  fail:
> > -	warn_alloc(gfp_mask, ac->nodemask,
> > +	if (!debug_guardpage_minorder())
> > +		warn_alloc(gfp_mask, ac->nodemask,
> >  			"page allocation failure: order:%u", order);
> >  got_pg:
> >  	return page;
> 
> Looks good to me assuming it will be applied on top of Tetsuo's patch.

This also asks for a comment explaining why debug_guardpage_minorder is
special. Your previous clarification should be OK.
 
> Reviewed-by: Stanislaw Gruszka <sgruszka@redhat.com>

Tetsuo care to send an updated patch?
-- 
Michal Hocko
SUSE Labs

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  reply	other threads:[~2017-04-12 12:12 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-04-11 11:27 Tetsuo Handa
2017-04-12 10:23 ` Stanislaw Gruszka
2017-04-12 10:41   ` Tetsuo Handa
2017-04-12 11:08     ` Stanislaw Gruszka
2017-04-12 10:59   ` Michal Hocko
2017-04-12 11:21     ` Stanislaw Gruszka
2017-04-12 11:35       ` Michal Hocko
2017-04-12 11:48         ` Stanislaw Gruszka
2017-04-12 12:12           ` Michal Hocko [this message]
2017-04-12 12:14           ` Tetsuo Handa
2017-04-12 12:30             ` Michal Hocko
2017-04-12 13:49               ` Tetsuo Handa
2017-04-12 14:07                 ` Michal Hocko

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