From: Bojan Smojver <bojan@rexursive.com>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: linux-kernel@vger.kernel.org,
Linux PM list <linux-pm@vger.kernel.org>,
Per Olofsson <pelle@debian.org>
Subject: Re: [PATCH v8]: Hibernation: lower/better control the amount of pages used for buffering
Date: Tue, 10 Apr 2012 12:25:54 +1000 [thread overview]
Message-ID: <1334024754.2103.9.camel@shrek.rexursive.com> (raw)
In-Reply-To: <2cbc3801-3ab0-4ef6-84cd-d69a23ff4dcc@email.android.com>
On Sun, 2012-04-08 at 10:14 +1000, Bojan Smojver wrote:
> Please ignore this request. As it turns out, the hangs are still
> there, it just takes a bit longer to trigger.
Thanks to Per Olofsson, who actually determined what was going on, we
now know what the problem is.
My "free pages" maths used nr_free_pages() macro, which deals with all
free pages. However, we only allocate buffers from non-high zones. So,
on systems where there is a significant number of high pages free, we
get a very large number (even if only a quarter is used), which then
gets the kernel into a bind and eventually hangs it on page allocation.
Will send a patch shortly, which will also have some other fixes.
--
Bojan
prev parent reply other threads:[~2012-04-10 2:25 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-04-03 2:02 [PATCH v8]: Hibernation: lower/better control the amount of pages used for buffering Bojan Smojver
2012-04-03 4:31 ` Rafael J. Wysocki
2012-04-03 5:53 ` Bojan Smojver
2012-04-05 10:15 ` Bojan Smojver
2012-04-08 0:14 ` Bojan Smojver
2012-04-10 2:25 ` Bojan Smojver [this message]
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