linux-kernel - Re: [PATCH v3 13/14] mm, hugetlb: retry if failed to allocate and there is concurrent user

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Message-Id: <20140114205603.f4fd2678.akpm@linux-foundation.org>
Date:	Tue, 14 Jan 2014 20:56:03 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Davidlohr Bueso <davidlohr@...com>
Cc:	David Rientjes <rientjes@...gle.com>,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Mel Gorman <mgorman@...e.de>, Rik van Riel <riel@...hat.com>,
	Michal Hocko <mhocko@...e.cz>,
	"Aneesh Kumar K.V" <aneesh.kumar@...ux.vnet.ibm.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Davidlohr Bueso <davidlohr.bueso@...com>,
	David Gibson <david@...son.dropbear.id.au>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org,
	Wanpeng Li <liwanp@...ux.vnet.ibm.com>,
	Naoya Horiguchi <n-horiguchi@...jp.nec.com>,
	Hillf Danton <dhillf@...il.com>, aswin@...com
Subject: Re: [PATCH v3 13/14] mm, hugetlb: retry if failed to allocate and
 there is concurrent user

On Tue, 14 Jan 2014 20:37:49 -0800 Davidlohr Bueso <davidlohr@...com> wrote:

> On Tue, 2014-01-14 at 19:08 -0800, David Rientjes wrote:
> > On Mon, 6 Jan 2014, Davidlohr Bueso wrote:
> > 
> > > > If Andrew agree, It would be great to merge 1-7 patches into mainline
> > > > before your mutex approach. There are some of clean-up patches and, IMO,
> > > > it makes the code more readable and maintainable, so it is worth to merge
> > > > separately.
> > > 
> > > Fine by me.
> > > 
> > 
> > It appears like patches 1-7 are still missing from linux-next, would you 
> > mind posting them in a series with your approach?
> 
> I haven't looked much into patches 4-7, but at least the first three are
> ok. I was waiting for Andrew to take all seven for linux-next and then
> I'd rebase my approach on top. Anyway, unless Andrew has any
> preferences, if by later this week they're not picked up, I'll resend
> everything.

Well, we're mainly looking for bugfixes this last in the cycle. 
"[PATCH v3 03/14] mm, hugetlb: protect region tracking via newly
introduced resv_map lock" fixes a bug, but I'd assumed that it depended
on earlier patches.  If we think that one is serious then it would be
better to cook up a minimal fix which is backportable into 3.12 and
eariler?
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