linux-kernel - Re: Android low memory killer vs. memory pressure notifications

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Message-ID: <4EF144D1.2020807@am.sony.com>
Date:	Tue, 20 Dec 2011 18:30:41 -0800
From:	Frank Rowand <frank.rowand@...sony.com>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
CC:	"Rowand, Frank" <Frank_Rowand@...yusa.com>,
	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Arve Hjønnevåg <arve@...roid.com>,
	Rik van Riel <riel@...hat.com>, Pavel Machek <pavel@....cz>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Andrew Morton <akpm@...ux-foundation.org>,
	John Stultz <john.stultz@...aro.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Johannes Weiner <hannes@...xchg.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	"tbird20d@...il.com" <tbird20d@...il.com>
Subject: Re: Android low memory killer vs. memory pressure notifications

On 12/20/11 18:07, Anton Vorontsov wrote:
> On Tue, Dec 20, 2011 at 05:14:18PM -0800, Frank Rowand wrote:

< snip >

>> And for embedded and for real-time, some of us do not want cgroups to be
>> a mandatory thing.  We want it to remain configurable.  My personal
>> interest is in keeping the latency of certain critical paths (especially
>> in the scheduler) short and consistent.
> 
> Much thanks for your input! That would be quite strong argument for going
> with /dev/mem_notify approach. Do you have any specific numbers how cgroups
> makes scheduler latencies worse?

Sorry, I don't have specific numbers.  And the numbers would be workload
specific anyway.

-Frank

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