linux-kernel - Re: [patch 5/7 -mm] oom: replace sysctls with quick mode

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Date:	Tue, 16 Feb 2010 01:04:44 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Rik van Riel <riel@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Nick Piggin <npiggin@...e.de>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Balbir Singh <balbir@...ux.vnet.ibm.com>,
	Lubos Lunak <l.lunak@...e.cz>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: Re: [patch 5/7 -mm] oom: replace sysctls with quick mode

On Tue, 16 Feb 2010, KOSAKI Motohiro wrote:

> > > "_quick" is always bad sysctl name.
> > 
> > Why?  It does exactly what it says: it kills current without doing an 
> > expensive tasklist scan and suppresses the possibly long tasklist dump.  
> > That's the oom killer's "quick mode."
> 
> Because, an administrator think "_quick" implies "please use it always".
> plus, "quick" doesn't describe clealy meanings. oom_dump_tasks does.
> 

The audience for both of these tunables (now that oom_dump_tasks is 
default to enabled) is users with extremely long tasklists that want to 
avoid those scans, so oom_kill_quick implies that it won't waste any time 
and will act how it's documented: simply kill current and move on.
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