linux-kernel - Re: [RFC v3 0/3] vmpressure_fd: Linux VM pressure notifications

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Message-ID: <20121121093056.GA31882@shutemov.name>
Date:	Wed, 21 Nov 2012 11:30:56 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	David Rientjes <rientjes@...gle.com>
Cc:	Glauber Costa <glommer@...allels.com>,
	Anton Vorontsov <anton.vorontsov@...aro.org>,
	Pekka Enberg <penberg@...nel.org>,
	Mel Gorman <mgorman@...e.de>,
	Leonid Moiseichuk <leonid.moiseichuk@...ia.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Minchan Kim <minchan@...nel.org>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
	John Stultz <john.stultz@...aro.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, linaro-kernel@...ts.linaro.org,
	patches@...aro.org, kernel-team@...roid.com,
	linux-man@...r.kernel.org,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Michal Hocko <mhocko@...e.cz>,
	Johannes Weiner <hannes@...xchg.org>, Tejun Heo <tj@...nel.org>
Subject: Re: [RFC v3 0/3] vmpressure_fd: Linux VM pressure notifications

On Tue, Nov 20, 2012 at 10:02:45AM -0800, David Rientjes wrote:
> On Mon, 19 Nov 2012, Glauber Costa wrote:
> 
> > >> In the case I outlined below, for backwards compatibility. What I
> > >> actually mean is that memcg *currently* allows arbitrary notifications.
> > >> One way to merge those, while moving to a saner 3-point notification, is
> > >> to still allow the old writes and fit them in the closest bucket.
> > >>
> > > 
> > > Yeah, but I'm wondering why three is the right answer.
> > > 
> > 
> > This is unrelated to what I am talking about.
> > I am talking about pre-defined values with a specific event meaning (in
> > his patchset, 3) vs arbitrary numbers valued in bytes.
> > 
> 
> Right, and I don't see how you can map the memcg thresholds onto Anton's 
> scheme

BTW, there's interface for OOM notification in memcg. See oom_control.
I guess other pressure levels can also fit to the interface.

-- 
 Kirill A. Shutemov
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