linux-kernel - Re: [PATCH] Revert "mm: remove __GFP_NO

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Message-Id: <20121116115124.c2981abc.akpm@linux-foundation.org>
Date:	Fri, 16 Nov 2012 11:51:24 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Josh Boyer <jwboyer@...il.com>
Cc:	Mel Gorman <mgorman@...e.de>, Zdenek Kabelac <zkabelac@...hat.com>,
	Seth Jennings <sjenning@...ux.vnet.ibm.com>,
	Jiri Slaby <jslaby@...e.cz>, Valdis.Kletnieks@...edu,
	Jiri Slaby <jirislaby@...il.com>, linux-mm@...ck.org,
	LKML <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Robert Jennings <rcj@...ux.vnet.ibm.com>
Subject: Re: [PATCH] Revert "mm: remove __GFP_NO_KSWAPD"

On Fri, 16 Nov 2012 14:14:47 -0500
Josh Boyer <jwboyer@...il.com> wrote:

> > The temptation is to supply a patch that checks if kswapd was woken for
> > THP and if so ignore pgdat->kswapd_max_order but it'll be a hack and not
> > backed up by proper testing. As 3.7 is very close to release and this is
> > not a bug we should release with, a safer path is to revert "mm: remove
> > __GFP_NO_KSWAPD" for now and revisit it with the view to ironing out the
> > balance_pgdat() logic in general.
> >
> > Signed-off-by: Mel Gorman <mgorman@...e.de>
> 
> Does anyone know if this is queued to go into 3.7 somewhere?  I looked
> a bit and can't find it in a tree.  We have a few reports of Fedora
> rawhide users hitting this.

Still thinking about it.  We're reverting quite a lot of material
lately. 
mm-revert-mm-vmscan-scale-number-of-pages-reclaimed-by-reclaim-compaction-based-on-failures.patch
and revert-mm-fix-up-zone-present-pages.patch are queued for 3.7.

I'll toss this one in there as well, but I can't say I'm feeling
terribly confident.  How is Valdis's machine nowadays?
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