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

[Marc Duponcheel <marc@offline.be>]

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 Hi David, others

Results seem OK

 recap: I have 2 6core 64bit opterons and I make -j13

I do

# 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

hope this helps

 Thanks

have a nice day

On 2012 Nov 15, Marc Duponcheel wrote:
>  Hi David
> 
> Thanks for the changeset
> 
> I will test 3.6.6 without&with this weekend.
> 
>  Have a nice day

--
 Marc Duponcheel
 Velodroomstraat 74 - 2600 Berchem - Belgium
 +32 (0)478 68.10.91 - marc@offline.be

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