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Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of RAM that should be free

From Tejun Heo <tj@kernel.org>
Newsgroups linux.kernel
Subject Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of RAM that should be free
Date 2016-11-30 21:40 +0100
Message-ID <sJjPA-2oq-25@gated-at.bofh.it> (permalink)
References (5 earlier) <sIU4N-2TK-3@gated-at.bofh.it> <sIUHv-37J-11@gated-at.bofh.it> <sIV0S-3tJ-11@gated-at.bofh.it> <sJhb3-F2-7@gated-at.bofh.it> <sJhE5-17j-19@gated-at.bofh.it>
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Hello,

On Wed, Nov 30, 2016 at 10:14:50AM -0800, Linus Torvalds wrote:
> Tejun/Kent - any way to just limit the workqueue depth for bcache?
> Because that really isn't helping, and things *will* time out and
> cause those problems when you have hundreds of IO's queued on a disk
> that likely as a write iops around ~100..

Yeah, easily.  I'm assuming it's gonna be the bcache_wq allocated in
from bcache_init().  It's currently using 0 as @max_active and it can
set to be any arbitrary number.  It'd be a very crude way to control
what looks like a buffer bloat with IOs tho.  We can make it a bit
more granular by splitting workqueues per bcache instance / purpose
but for the long term the right solution seems to be hooking into
writeback throttling mechanism that block layer just grew recently.

Thanks.

-- 
tejun

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Thread

Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Michal Hocko <mhocko@kernel.org> - 2016-11-28 08:30 +0100
  Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of RAM that should be free Marc MERLIN <marc@merlins.org> - 2016-11-28 22:00 +0100
  Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Marc MERLIN <marc@merlins.org> - 2016-11-29 17:00 +0100
    Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Michal Hocko <mhocko@kernel.org> - 2016-11-29 17:10 +0100
      Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Marc MERLIN <marc@merlins.org> - 2016-11-29 17:40 +0100
        Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-29 18:10 +0100
          Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Marc MERLIN <marc@merlins.org> - 2016-11-29 18:50 +0100
            Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-29 19:10 +0100
              Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Marc MERLIN <marc@merlins.org> - 2016-11-30 18:50 +0100
                Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Linus Torvalds <torvalds@linux-foundation.org> - 2016-11-30 19:20 +0100
                Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Marc MERLIN <marc@merlins.org> - 2016-11-30 19:30 +0100
                Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Tejun Heo <tj@kernel.org> - 2016-11-30 21:40 +0100
                Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Kent Overstreet <kent.overstreet@gmail.com> - 2016-12-01 15:00 +0100
                Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Linus Torvalds <torvalds@linux-foundation.org> - 2016-12-01 19:20 +0100
                Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Linus Torvalds <torvalds@linux-foundation.org> - 2016-12-01 19:40 +0100
            Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of RAM that should be free Marc MERLIN <marc@merlins.org> - 2016-11-30 00:10 +0100
              Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp> - 2016-11-30 15:00 +0100
  Re: 4.8.8 kernel trigger OOM killer repeatedly when I have lots of  RAM that should be free Marc MERLIN <marc@merlins.org> - 2016-11-29 17:20 +0100

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