From: Mel Gorman <mel@csn.ul.ie>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
stable@kernel.org, Rik van Riel <riel@redhat.com>,
Christoph Hellwig <hch@infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Dave Chinner <david@fromorbit.com>,
Chris Mason <chris.mason@oracle.com>,
Nick Piggin <npiggin@suse.de>,
Johannes Weiner <hannes@cmpxchg.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Minchan Kim <minchan.kim@gmail.com>, Andreas Mohr <andi@lisas.de>,
Bill Davidsen <davidsen@tmr.com>,
Ben Gamari <bgamari.foss@gmail.com>
Subject: Re: Why PAGEOUT_IO_SYNC stalls for a long time
Date: Wed, 4 Aug 2010 12:10:06 +0100 [thread overview]
Message-ID: <20100804111005.GA17745@csn.ul.ie> (raw)
In-Reply-To: <20100801174229.4B08.A69D9226@jp.fujitsu.com>
On Sun, Aug 01, 2010 at 05:47:08PM +0900, KOSAKI Motohiro wrote:
> > > side note: page lock contention is very common case.
> > >
> > > For case (8), I don't think sleeping is right way. get_page() is used in really various place of
> > > our kernel. so we can't assume it's only temporary reference count increasing.
> >
> > In what case is a munlocked pages reference count permanently increased and
> > why is this not a memory leak?
>
> V4L, audio, GEM and/or other multimedia driver?
>
Ok, that is quite likely. Have you made a start on a series related to
lumpy reclaim? I was holding off making a start on such a thing while I
reviewed the other writeback issues and travelling to MM Summit is going
to delay things for me. If you haven't started when I get back, I'll
make some sort of stab at it.
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
WARNING: multiple messages have this Message-ID (diff)
From: Mel Gorman <mel@csn.ul.ie>
To: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
stable@kernel.org, Rik van Riel <riel@redhat.com>,
Christoph Hellwig <hch@infradead.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Dave Chinner <david@fromorbit.com>,
Chris Mason <chris.mason@oracle.com>,
Nick Piggin <npiggin@suse.de>,
Johannes Weiner <hannes@cmpxchg.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Minchan Kim <minchan.kim@gmail.com>, Andreas Mohr <andi@lisas.de>,
Bill Davidsen <davidsen@tmr.com>,
Ben Gamari <bgamari.foss@gmail.com>
Subject: Re: Why PAGEOUT_IO_SYNC stalls for a long time
Date: Wed, 4 Aug 2010 12:10:06 +0100 [thread overview]
Message-ID: <20100804111005.GA17745@csn.ul.ie> (raw)
In-Reply-To: <20100801174229.4B08.A69D9226@jp.fujitsu.com>
On Sun, Aug 01, 2010 at 05:47:08PM +0900, KOSAKI Motohiro wrote:
> > > side note: page lock contention is very common case.
> > >
> > > For case (8), I don't think sleeping is right way. get_page() is used in really various place of
> > > our kernel. so we can't assume it's only temporary reference count increasing.
> >
> > In what case is a munlocked pages reference count permanently increased and
> > why is this not a memory leak?
>
> V4L, audio, GEM and/or other multimedia driver?
>
Ok, that is quite likely. Have you made a start on a series related to
lumpy reclaim? I was holding off making a start on such a thing while I
reviewed the other writeback issues and travelling to MM Summit is going
to delay things for me. If you haven't started when I get back, I'll
make some sort of stab at it.
--
Mel Gorman
Part-time Phd Student Linux Technology Center
University of Limerick IBM Dublin Software Lab
--
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next prev parent reply other threads:[~2010-08-04 11:10 UTC|newest]
Thread overview: 69+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-28 7:17 [PATCH] vmscan: raise the bar to PAGEOUT_IO_SYNC stalls Wu Fengguang
2010-07-28 7:17 ` Wu Fengguang
2010-07-28 7:49 ` Minchan Kim
2010-07-28 7:49 ` Minchan Kim
2010-07-28 8:46 ` [PATCH] vmscan: remove wait_on_page_writeback() from pageout() Wu Fengguang
2010-07-28 8:46 ` Wu Fengguang
2010-07-28 9:10 ` Mel Gorman
2010-07-28 9:10 ` Mel Gorman
2010-07-28 9:30 ` Wu Fengguang
2010-07-28 9:30 ` Wu Fengguang
2010-07-28 9:45 ` Mel Gorman
2010-07-28 9:45 ` Mel Gorman
2010-07-28 9:43 ` KOSAKI Motohiro
2010-07-28 9:43 ` KOSAKI Motohiro
2010-07-28 9:50 ` Mel Gorman
2010-07-28 9:50 ` Mel Gorman
2010-07-28 9:59 ` KOSAKI Motohiro
2010-07-28 9:59 ` KOSAKI Motohiro
2010-08-01 5:27 ` Wu Fengguang
2010-08-01 5:27 ` Wu Fengguang
2010-08-01 5:49 ` Wu Fengguang
2010-08-01 8:32 ` KOSAKI Motohiro
2010-08-01 8:32 ` KOSAKI Motohiro
2010-08-01 8:35 ` Wu Fengguang
2010-08-01 8:35 ` Wu Fengguang
2010-08-01 8:40 ` KOSAKI Motohiro
2010-08-01 8:40 ` KOSAKI Motohiro
2010-08-01 5:17 ` Wu Fengguang
2010-08-01 5:17 ` Wu Fengguang
2010-07-28 16:29 ` Minchan Kim
2010-07-28 16:29 ` Minchan Kim
2010-07-28 11:40 ` Why PAGEOUT_IO_SYNC stalls for a long time KOSAKI Motohiro
2010-07-28 11:40 ` KOSAKI Motohiro
2010-07-28 13:10 ` Mel Gorman
2010-07-28 13:10 ` Mel Gorman
2010-07-29 10:34 ` KOSAKI Motohiro
2010-07-29 10:34 ` KOSAKI Motohiro
2010-07-29 14:24 ` Mel Gorman
2010-07-29 14:24 ` Mel Gorman
2010-07-30 4:54 ` KOSAKI Motohiro
2010-07-30 4:54 ` KOSAKI Motohiro
2010-07-30 10:30 ` Mel Gorman
2010-07-30 10:30 ` Mel Gorman
2010-08-01 8:47 ` KOSAKI Motohiro
2010-08-01 8:47 ` KOSAKI Motohiro
2010-08-04 11:10 ` Mel Gorman [this message]
2010-08-04 11:10 ` Mel Gorman
2010-08-05 6:20 ` KOSAKI Motohiro
2010-08-05 6:20 ` KOSAKI Motohiro
2010-08-05 8:09 ` Andreas Mohr
2010-08-05 8:09 ` Andreas Mohr
2010-07-28 17:30 ` Andrew Morton
2010-07-28 17:30 ` Andrew Morton
2010-07-29 1:01 ` KOSAKI Motohiro
2010-07-29 1:01 ` KOSAKI Motohiro
2010-07-30 13:17 ` [PATCH] vmscan: raise the bar to PAGEOUT_IO_SYNC stalls Andrea Arcangeli
2010-07-30 13:17 ` Andrea Arcangeli
2010-07-30 13:31 ` Mel Gorman
2010-07-30 13:31 ` Mel Gorman
2010-07-31 16:13 ` Wu Fengguang
2010-07-31 16:13 ` Wu Fengguang
2010-07-31 17:33 ` Christoph Hellwig
2010-07-31 17:33 ` Christoph Hellwig
2010-07-31 17:55 ` Pekka Enberg
2010-07-31 17:55 ` Pekka Enberg
2010-07-31 17:59 ` Christoph Hellwig
2010-07-31 17:59 ` Christoph Hellwig
2010-07-31 18:09 ` Pekka Enberg
2010-07-31 18:09 ` Pekka Enberg
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