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Date: Sun, 13 Feb 2011 11:47:01 +0100 From: Jindřich Makovička <makovick@...il.com> To: Andrea Arcangeli <aarcange@...hat.com> Cc: Mel Gorman <mel@....ul.ie>, linux-kernel@...r.kernel.org, Andrew Morton <akpm@...ux-foundation.org> Subject: Re: khugepaged: gets stuck when writing to USB flash, 2.6.38-rc2 2011/2/4 Andrea Arcangeli <aarcange@...hat.com>: > On Thu, Feb 03, 2011 at 10:16:17PM +0100, Jindřich Makovička wrote: >> I also tried echo never > /sys/kernel/mm/transparent_hugepage/defrag >> , and it seems preventing the system freeze, but still the copying >> itself sometimes comes to almost complete stop (GkrellM shows short >> spikes of tens of kB/s on the USB /dev/sdX). In this case, khugepaged >> is also in DN. I still didn't observe this problem when disabling THP >> completely by echo never > enabled . > > Ok then you may need this too: > > echo never > /sys/kernel/mm/transparent_hugepage/khugepaged/defrag > > Compaction is likely too heavy so we need to look into that. Sorry for the delay. Yes, disabling both defrag settings also solves the problem: echo never >/sys/kernel/mm/transparent_hugepage/defrag echo no > /sys/kernel/mm/transparent_hugepage/khugepaged/defrag -- Jindrich Makovicka -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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