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

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Message-ID: <20121107114321.GA32265@shutemov.name>
Date:	Wed, 7 Nov 2012 13:43:22 +0200
From:	"Kirill A. Shutemov" <kirill@...temov.name>
To:	Pekka Enberg <penberg@...nel.org>
Cc:	Anton Vorontsov <anton.vorontsov@...aro.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
Subject: Re: [RFC v3 0/3] vmpressure_fd: Linux VM pressure notifications

On Wed, Nov 07, 2012 at 01:28:12PM +0200, Pekka Enberg wrote:
> On Wed, Nov 7, 2012 at 1:21 PM, Kirill A. Shutemov <kirill@...temov.name> wrote:
> >> While the new API is very simple, it is still extensible (i.e. versioned).
> >
> > Sorry, I didn't follow previous discussion on this, but could you
> > explain what's wrong with memory notifications from memcg?
> > As I can see you can get pretty similar functionality using memory
> > thresholds on the root cgroup. What's the point?
> 
> Why should you be required to use cgroups to get VM pressure events to
> userspace?

Valid point. But in fact you have it on most systems anyway.

I personally don't like to have a syscall per small feature.
Isn't it better to have a file-based interface which can be used with
normal file syscalls: open()/read()/poll()?

-- 
 Kirill A. Shutemov
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