Messages in this thread |  | | | Date | Sun, 1 May 2011 21:59:35 -0700 (PDT) | | From | Christian Kujau <> | | Subject | Re: 2.6.39-rc4+: oom-killer busy killing tasks |
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On Sun, 1 May 2011 at 18:01, Dave Chinner wrote: > I really don't know why the xfs inode cache is not being trimmed. I > really, really need to know if the XFS inode cache shrinker is > getting blocked or not running - do you have those sysrq-w traces > when near OOM I asked for a while back?
I tried to generate those via /proc/sysrq-trigger (don't have a F13/Print Screen key), but the OOM killer kicks in prett fast - so fast thay my debug script, trying to generate sysrq-w every second was too late and the machine was already dead:
http://nerdbynature.de/bits/2.6.39-rc4/oom/ * messages-10.txt.gz * slabinfo-10.txt.bz2
Timeline: - du(1) started at 12:25:16 (and immediately listed as "blocked" task) - the last sysrq-w succeeded at 12:38:05, listing kswapd0 - du invoked oom-killer at 12:38:06
I'll keep trying...
> scan only scanned 516 pages. I can't see it freeing many inodes > (there's >600,000 of them in memory) based on such a low page scan > number.
Not sure if this is related...this XFS filesytem I'm running du(1) on is ~1 TB in size, with 918K allocated inodes, if df(1) is correct:
# df -hi /mnt/backup/ Filesystem Inodes IUsed IFree IUse% Mounted on /dev/mapper/wdc1 37M 918K 36M 3% /mnt/backup
> Maybe you should tweak /proc/sys/vm/vfs_cache_pressure to make it > reclaim vfs structures more rapidly. It might help
/proc/sys/vm/vfs_cache_pressure is currently set to '100'. You mean I should increase it? To..150? 200? 1000?
Thanks, Christian. -- BOFH excuse #347:
The rubber band broke
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