linux-kernel - Re: [PATCH 1/2] Add mempressure cgroup

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Message-ID: <20130111060959.GA22981@lizard.gateway.2wire.net>
Date:	Thu, 10 Jan 2013 22:09:59 -0800
From:	Anton Vorontsov <anton.vorontsov@...aro.org>
To:	Minchan Kim <minchan@...nel.org>
Cc:	David Rientjes <rientjes@...gle.com>,
	Pekka Enberg <penberg@...nel.org>,
	Mel Gorman <mgorman@...e.de>,
	Glauber Costa <glommer@...allels.com>,
	Michal Hocko <mhocko@...e.cz>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	Luiz Capitulino <lcapitulino@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Greg Thelen <gthelen@...gle.com>,
	Leonid Moiseichuk <leonid.moiseichuk@...ia.com>,
	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	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
Subject: Re: [PATCH 1/2] Add mempressure cgroup

On Fri, Jan 11, 2013 at 02:56:15PM +0900, Minchan Kim wrote:
[...]
> > Ahh. You're talking about the shrinker interface. Yes, there is no way to
> > tell if the freed memory will be actually "released" (and if not, then
> > yes, we released it unnecessary).
> 
> I don't tell about actually "released" or not.
> I assume application actually release pages but the pages would be another
> zones, NOT targetted zone from kernel. In case of that, kernel could ask
> continuously until target zone has enough free memory.
[...]
> > isolate task to only some nodes/zones, if we really care about precise
> > accounting?). But I'm surely open for ideas. :)
> 
> My dumb idea is only notify to user when reclaim is triggered by
> __GFP_HIGHMEM|__GFP_MOVABLE which is most gfp_t for application memory. :)

Ah, I see. Sure, that will help a lot. I'll try to incorporate this into
the next iteration. But there are still unresolved accounting issues that
I outlined, and I don't think that they are this easy to solve. :)

Thanks!

Anton
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