linux-kernel - Re: [ 36/40] mm: vmscan: convert global reclaim to per-memcg LRU lists

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Message-ID: <20120730152944.GA21091@kroah.com>
Date:	Mon, 30 Jul 2012 08:29:44 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	Ben Hutchings <ben@...adent.org.uk>
Cc:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk
Subject: Re: [ 36/40] mm: vmscan: convert global reclaim to per-memcg LRU
 lists

On Mon, Jul 30, 2012 at 01:25:17AM +0100, Ben Hutchings wrote:
> On Thu, 2012-07-26 at 14:29 -0700, Greg Kroah-Hartman wrote:
> > From: Greg KH <gregkh@...uxfoundation.org>
> > 
> > 3.0-stable review patch.  If anyone has any objections, please let me know.
> > 
> > ------------------
> > 
> > From: Johannes Weiner <jweiner@...hat.com>
> > 
> > commit b95a2f2d486d0d768a92879c023a03757b9c7e58 upstream - WARNING: this is a substitute patch.
> > 
> > Stable note: Not tracked in Bugzilla. This is a partial backport of an
> > 	upstream commit addressing a completely different issue
> > 	that accidentally contained an important fix. The workload
> > 	this patch helps was memcached when IO is started in the
> > 	background. memcached should stay resident but without this patch
> > 	it gets swapped. Sometimes this manifests as a drop in throughput
> > 	but mostly it was observed through /proc/vmstat.
> [...]
> > The impact of the accidental fix is to make it harder for kswapd to force
> > scan small targets by taking zone->all_unreclaimable into account. This
> > patch is the closest equivalent available based on what is backported.
> > 
> > ---
> >  mm/vmscan.c |    3 ++-
> >  1 file changed, 2 insertions(+), 1 deletion(-)
> [...]
> 
> This is missing sign-offs.

Oops, my fault, somehow they got lost, I'll go add them back (it's just
Mel's and mine.)

greg k-h
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