Re: [3.6 regression?] THP + migration/compaction livelock (Ithink)

[David Rientjes]

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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