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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <alpine.DEB.2.10.1507141855200.6993@chino.kir.corp.google.com>
Date:	Tue, 14 Jul 2015 18:57:14 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	Xuzhichuang <xuzhichuang@...wei.com>
cc:	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Songjiangtao (mygirlsjt)" <songjiangtao.song@...wei.com>,
	"Zhangwei (FF)" <zw.zhang@...wei.com>,
	Qiuxishi <qiuxishi@...wei.com>
Subject: Re: 答复: [BUG REPORT] OOM Killer is invoked while the system still has much memory

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!
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/