linux-kernel - Re: [PATCH] Fix the issue that lowmemkiller fell into a cycle that try to kill a task

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Message-ID: <alpine.DEB.2.02.1409231523320.22630@chino.kir.corp.google.com>
Date:	Tue, 23 Sep 2014 15:24:30 -0700 (PDT)
From:	David Rientjes <rientjes@...gle.com>
To:	朱辉 <zhuhui@...omi.com>
cc:	Weijie Yang <weijie.yang.kh@...il.com>,
	Greg KH <gregkh@...uxfoundation.org>,
	"vinayakm.list@...il.com" <vinayakm.list@...il.com>,
	"weijie.yang@...sung.com" <weijie.yang@...sung.com>,
	"devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"teawater@...il.com" <teawater@...il.com>
Subject: Re: [PATCH] Fix the issue that lowmemkiller fell into a cycle that
 try to kill a task

On Tue, 23 Sep 2014, 朱辉 wrote:

> > By the way, whether we need to modify out_of_memory() which also
> > try to kill task?
> 
> I am not sure because LMK handle the memory issue early than OOM.
> But I think this issue will not affect OOM because OOM has oom_zonelist_trylock and oom_zonelist_unlock.
> 

The oom killer tries to schedule other processes that exit the oom killer 
without being a victim itself and any process that cannot get the zonelist 
lock will do the same in the page allocator.  The low memory killer case 
is somewhat different.