linux-kernel - Re: [Alsa-user] new source of MIDI playback slow-down identified - 5a03b051ed87e72b959f32a86054e1142ac4cf55 thp: use compaction in kswapd for GFP

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Date:	Wed, 23 Feb 2011 04:17:44 +1030
From:	Arthur Marsh <arthur.marsh@...ernode.on.net>
To:	Andrea Arcangeli <aarcange@...hat.com>
CC:	Clemens Ladisch <cladisch@...glemail.com>,
	alsa-user@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	Mel Gorman <mel@....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



Andrea Arcangeli wrote, on 23/02/11 02:45:
> On Tue, Feb 22, 2011 at 02:40:47PM +0100, Andrea Arcangeli wrote:
>>   	spin_lock_irq(&zone->lru_lock);
>>   	for (; low_pfn<  end_pfn; low_pfn++) {
>>   		struct page *page;
>> +
>> +		cond_resched();
>> +
>
> my bad, see the above spin_lock_irq oops...
>
> I attached two replacement patches to apply in order (both of them
> should be applied at the same time on top of git upstream, and they
> shouldn't lockup this time).

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.

Regards,

Arthur.
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