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Date: Tue, 11 Mar 2014 00:51:09 -0400
From: Dave Jones <davej@redhat.com>
Subject: Re: bad rss-counter message in 3.14rc5
Message-ID: <20140311045109.GB12551@redhat.com>
References: <20140305174503.GA16335@redhat.com>
 <20140305175725.GB16335@redhat.com>
 <20140307002210.GA26603@redhat.com>
 <20140311024906.GA9191@redhat.com>
 <20140310201340.81994295.akpm@linux-foundation.org>
 <20140310214612.3b4de36a.akpm@linux-foundation.org>
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In-Reply-To: <20140310214612.3b4de36a.akpm@linux-foundation.org>
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To: Andrew Morton <akpm@linux-foundation.org>
Cc: Linux Kernel <linux-kernel@vger.kernel.org>, linux-mm@kvack.org, Linus Torvalds <torvalds@linux-foundation.org>, Sasha Levin <sasha.levin@oracle.com>, Cyrill Gorcunov <gorcunov@gmail.com>, Joonsoo Kim <iamjoonsoo.kim@lge.com>, Wanpeng Li <liwanp@linux.vnet.ibm.com>, Bob Liu <bob.liu@oracle.com>, Konstantin Khlebnikov <koct9i@gmail.com>

On Mon, Mar 10, 2014 at 09:46:12PM -0700, Andrew Morton wrote:
 > On Mon, 10 Mar 2014 20:13:40 -0700 Andrew Morton <akpm@linux-foundation.org> wrote:
 > 
 > > > Anyone ? I'm hitting this trace on an almost daily basis, which is a pain
 > > > while trying to reproduce a different bug..
 > > 
 > > Damn, I thought we'd fixed that but it seems not.  Cc's added.
 > > 
 > > Guys, what stops the migration target page from coming unlocked in
 > > parallel with zap_pte_range()'s call to migration_entry_to_page()?
 > 
 > page_table_lock, sort-of.  At least, transitions of is_migration_entry()
 > and page_locked() happen under ptl.
 > 
 > I don't see any holes in regular migration.  Do you know if this is
 > reproducible with CONFIG_NUMA_BALANCING=n or CONFIG_NUMA=n?

CONFIG_NUMA_BALANCING was n already btw, so I'll do a NUMA=n run.

	Dave

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