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Date: Wed, 4 May 2011 16:38:42 +0200 From: Andrea Arcangeli <aarcange@...hat.com> To: Thomas Sattler <tsattler@....de> Cc: Linux Kernel Mailing List <linux-kernel@...r.kernel.org> Subject: Re: iotop: khugepaged at 99.99% (2.6.38.3) Hello Thomas, On Wed, May 04, 2011 at 02:20:04PM +0200, Thomas Sattler wrote: > Different machine (kernel 2.6.38.2) 4x SYSRQ+l > > http://pastebin.com/raw.php?i=B2XeVyz6 > (URL should be valid for one month) > > Since this is a DualCore machine, it is still > quite usable. I'll try to keep it running, in > case you need more details. > > BTW: I haven't seen the problem with 2.6.38.4 > so far. May have been fixed in the meantime? There's no sign of khugepaged in the traces :( and one of the two cpu is always idle (the other is often idle too). Maybe khugepaged was stuck in D state and that is shown as 100% load for iotop? Please next time can you run SYSRQ+t too in addition of SYSRQ+l? (I should have suggested it right away but I thought khugepaged was running at 100% cpu load and sysrq+t wouldn't have been as interesting in that case). You can run also a "ps xal" to see the actual scheduler task state. I suggest to stay at .2 if it reproduces it more easily. If we understand what it is, it'll be easy to tell if it was already fixed in 2.6.38.4 but I doubt unless it's not related to MM. Thanks a lot for the help, Andrea -- 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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