linux-kernel - Re: iotop: khugepaged at 99.99% (2.6.38.X)

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Date:	Fri, 06 May 2011 10:49:45 +0200
From:	Thomas Sattler <tsattler@....de>
To:	Andrea Arcangeli <aarcange@...hat.com>
CC:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Mel Gorman <mel@....ul.ie>
Subject: Re: iotop: khugepaged at 99.99% (2.6.38.X)

> You can already run "grep threshold /proc/zoneinfo" on the system
> where you reproduced the hang the last time (the one running 2.6.38.4)
> the one with 1.5G of ram. They all should be well below 512 (so in
> theory not causing troubles because of the per-cpu stats, and with so
> few cpus it shouldn't have been such a longstanding problem anyway).

'grep threshold /proc/zoneinfo' returns nothing on this machine after
a reboot and before a crash. Did I tell it's a single core machine?

> If you didn't reboot that system after the last hang

I'm sorry, I already rebooted the machine.

> grep nr_isolated_anon /proc/zoneinfo 
>     nr_isolated_anon 0
>     nr_isolated_anon 0
>     nr_isolated_anon 0

Same here, on both machines. Both between reboot and crash.

> This patch may help you to reproduce much quicker,

I applied the patch. I plan to boot this kernel within the next hour.

> -	sync_migration = !(gfp_mask & __GFP_NO_KSWAPD);
> +	sync_migration = true;

This was already done in my 2.6.38.2?

Thomas
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