From: Christoph Lameter <cl@linux-foundation.org>
To: mark gross <mgross@linux.intel.com>
Cc: linux-mm@kvack.org, npiggin@suse.de
Subject: Re: possible bug in find_get_pages
Date: Fri, 6 Mar 2009 14:28:50 -0500 (EST) [thread overview]
Message-ID: <alpine.DEB.1.10.0903061426190.20182@qirst.com> (raw)
In-Reply-To: <20090306192625.GA3267@linux.intel.com>
On Fri, 6 Mar 2009, mark gross wrote:
> It seems that page->_count == 0 at some point on some overnight runs
> with locks the system into a tight loop from the repeat: and a goto
> repeat in find_get_pages.
A page with ref count zero should not be in any mapping. If the page is in
a mapping then the page is used. Therefore the refcount should be > 0.
If there is a page with zero refcount and its in a mapping then something
erroneously decreased the refcount.
Nick wrote the code so I CCed him.
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next prev parent reply other threads:[~2009-03-06 19:39 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-03-06 19:26 mark gross
2009-03-06 19:28 ` Christoph Lameter [this message]
2009-03-06 21:13 ` mark gross
2009-03-06 21:29 ` Christoph Lameter
2009-03-10 10:49 ` Nick Piggin
2009-03-06 23:47 ` Minchan Kim
2009-03-09 16:43 ` mark gross
2009-03-10 10:45 ` Nick Piggin
2009-03-10 22:49 ` mark gross
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