From: Andrea Arcangeli <aarcange@redhat.com>
To: Arthur Marsh <arthur.marsh@internode.on.net>
Cc: Clemens Ladisch <cladisch@googlemail.com>,
alsa-user@lists.sourceforge.net, linux-kernel@vger.kernel.org,
Mel Gorman <mel@csn.ul.ie>
Subject: Re: [Alsa-user] new source of MIDI playback slow-down identified - 5a03b051ed87e72b959f32a86054e1142ac4cf55 thp: use compaction in kswapd for GFP_ATOMIC order > 0
Date: Tue, 22 Feb 2011 20:43:25 +0100 [thread overview]
Message-ID: <20110222194325.GE31195@random.random> (raw)
In-Reply-To: <4D63F6C0.7060204@internode.on.net>
On Wed, Feb 23, 2011 at 04:17:44AM +1030, Arthur Marsh wrote:
> OK, these patches applied together against upstream didn't cause a crash
> but I did observe:
>
> significant slowdowns of MIDI playback (moreso than in previous cases,
> and with less than 20 Meg of swap file in use);
>
> kswapd0 sharing equal top place in CPU usage at times (e.g. 20 percent).
>
> If I should try only one of the patches or something else entirely,
> please let me know.
For Mel: with z1, kswapd used only 0.1-3.9 percent of CPU while he
loaded other applications.
We may need a way to put kswapd in all uncompactable mode to solve
this, logic 3 just trying not to disable the all unreclaimable logic
seems not enough. I.e. if compact_zone_order doesn't return
COMPACT_COMPLETE, stop the compaction loop in kswapd. Then we can put
back in the COMPACT_MODE_KSWAPD return COMPACT_CONTINUE in
compact_finished as the caller will throttle it (and it won't run more
than one scan before putting kswapd to sleep in all uncompactable mode).
next prev parent reply other threads:[~2011-02-22 19:44 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <g0ia38-jj6.ln1@ppp121-45-136-118.lns11.adl6.internode.on.net>
2011-02-22 7:37 ` [Alsa-user] new source of MIDI playback slow-down identified - 5a03b051ed87e72b959f32a86054e1142ac4cf55 thp: use compaction in kswapd for GFP_ATOMIC order > 0 Clemens Ladisch
2011-02-22 7:46 ` Arthur Marsh
2011-02-22 13:40 ` Andrea Arcangeli
2011-02-22 16:15 ` Andrea Arcangeli
2011-02-22 16:59 ` Mel Gorman
2011-02-22 17:08 ` Andrea Arcangeli
2011-02-22 17:37 ` Mel Gorman
2011-02-22 17:47 ` Arthur Marsh
2011-02-22 19:43 ` Andrea Arcangeli [this message]
2011-02-23 9:15 ` Mel Gorman
2011-02-23 11:41 ` Arthur Marsh
2011-02-23 13:50 ` Clemens Ladisch
2011-02-23 17:01 ` Mel Gorman
2011-02-23 17:40 ` Andrea Arcangeli
2011-02-23 16:24 ` Andrea Arcangeli
2011-02-23 16:36 ` Andrea Arcangeli
2011-02-23 16:40 ` Andrea Arcangeli
2011-02-23 16:47 ` Andrea Arcangeli
2011-02-23 16:55 ` Andrea Arcangeli
2011-02-23 20:07 ` Arthur Marsh
2011-02-23 21:25 ` Andrea Arcangeli
2011-02-23 21:55 ` Arthur Marsh
2011-02-23 23:59 ` Andrea Arcangeli
2011-02-24 1:40 ` Arthur Marsh
2011-02-24 1:54 ` Andrea Arcangeli
2011-02-26 6:43 ` Andrea Arcangeli
2011-02-27 8:48 ` Arthur Marsh
2011-02-23 17:10 ` Mel Gorman
2011-02-23 17:27 ` Andrea Arcangeli
2011-02-23 17:44 ` Mel Gorman
2011-02-23 18:14 ` Andrea Arcangeli
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