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SubjectRe: [3.6 regression?] THP + migration/compaction livelock (I think)
On Sat, 17 Nov 2012, Marc Duponcheel wrote:

> # echo always >/sys/kernel/mm/transparent_hugepage/enabled
> # while [ 1 ]
> do
> sleep 10
> date
> echo = vmstat
> egrep "(thp|compact)" /proc/vmstat
> echo = khugepaged stack
> cat /proc/501/stack
> done > /tmp/49361.xxxx
> # emerge icedtea
> (where 501 = pidof khugepaged)
>
> for xxxx = base = 3.6.6
> and xxxx = test = 3.6.6 + diff you provided
>
> I attach
> /tmp/49361.base.gz
> and
> /tmp/49361.test.gz
>
> Note:
>
> with xxx=base, I could see
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 8617 root 20 0 3620m 41m 10m S 988.3 0.5 6:19.06 javac
> 1 root 20 0 4208 588 556 S 0.0 0.0 0:03.25 init
> already during configure and I needed to kill -9 javac
>
> with xxx=test, I could see
> PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
> 9275 root 20 0 2067m 474m 10m S 304.2 5.9 0:32.81 javac
> 710 root 0 -20 0 0 0 S 0.3 0.0 0:01.07 kworker/0:1H
> later when processing >700 java files
>
> Also note that with xxx=test compact_blocks_moved stays 0
>

Sounds good! Andy, have you had the opportunity to try to reproduce your
issue with the backports that Mel listed? I think he'll be considering
asking for some of these to be backported for a future stable release so
any input you can provide would certainly be helpful.


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