lkml.org 
[lkml]   [2011]   [Jan]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: kswapd hung tasks in 2.6.38-rc1
From
Date
On Mon, 2011-01-31 at 12:58 -0800, Dave Hansen wrote:
> On Thu, 2011-01-20 at 03:55 -0500, CAI Qian wrote:
> > When running LTP oom01 [1] testing, the allocation process stopped
> > processing right after starting to swap.
>
> I'm seeing the same stuff, but on -rc2. I thought it was
> transparent-hugepage-related, but I don't see much of a trace of it in
> the stack dumps.
>
> http://sr71.net/~dave/ibm/config-v2.6.38-rc2
>
> It happened to me as well around the time that things started to hit
> swap.

Still not a very good data point, but I ran a heavy swap load for an
hour or so without reproducing this. But, it happened again after I
enabled transparent huge pages. I managed to get a sysrq-t dump out of
it:

http://sr71.net/~dave/ibm/2.6.38-rc2-hang-0.txt

khugepaged is one of the three running tasks. Note, I set both its
sleep timeouts to zero to stress it out a bit.

I'll keep trying to reproduce without THP.

-- Dave



\
 
 \ /
  Last update: 2011-01-31 23:43    [W:0.094 / U:0.300 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site