Re: 答复: [BUG REPORT] OOM Killer is invoked while the system still has much memory

From	David Rientjes <rientjes@google.com>
Newsgroups	linux.kernel
Subject	Re: 答复: [BUG REPORT] OOM Killer is invoked while the system still has much memory
Date	2015-07-15 04:00 +0200
Message-ID	<pMk9j-1ri-3@gated-at.bofh.it> (permalink)
References	<pM2Fr-7F7-7@gated-at.bofh.it> <pMiqT-7Ep-11@gated-at.bofh.it> <pMjZE-1fX-5@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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On Wed, 15 Jul 2015, Xuzhichuang wrote:

> Hi,
> 
> Thanks for your replying.
> 
> According to the OOM message, OOM killer is invoked by the function seq_read, I found two patches in the latest kernel which can be avoid or fixed this problem.
> 
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/fs/seq_file.c?id=058504edd02667eef8fac9be27ab3ea74332e9b4
> https://git.kernel.org/cgit/linux/kernel/git/stable/linux-stable.git/commit/fs/seq_file.c?id=5cec38ac866bfb8775638e71a86e4d8cac30caae
> 
> As the patches said, it changed the seq_file code fallback to vmalloc allocations if kmalloc failed, instead of OOM kill processes.
> 

Yes, we use those two patches as well internally.  You may want to give 
them a try if this is the only source of oom killer issues, but keep in 
mind that other subsystems like the tcp layer will often do high-order 
allocations as well.  If you can free up some of that ZONE_DMA memory that 
is unneeded with lowmem_reserve_ratio, you might get a little more room.  

Good luck!
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Re: [BUG REPORT] OOM Killer is invoked while the system still has  much memory David Rientjes <rientjes@google.com> - 2015-07-15 02:10 +0200
  答复: [BUG REPORT] OOM Killer is invoked while the system still has much memory Xuzhichuang <xuzhichuang@huawei.com> - 2015-07-15 03:50 +0200
    Re: 答复: [BUG REPORT] OOM Killer is invoked while the system still has much memory David Rientjes <rientjes@google.com> - 2015-07-15 04:00 +0200

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