linux-kernel - Re: [PATCH v5 0/4] cgroup notifications API and memory thresholds

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Message-ID: <20100104003612.GF16187@balbir.in.ibm.com>
Date:	Mon, 4 Jan 2010 06:06:12 +0530
From:	Balbir Singh <balbir@...ux.vnet.ibm.com>
To:	"Kirill A. Shutemov" <kirill@...temov.name>
Cc:	containers@...ts.linux-foundation.org, linux-mm@...ck.org,
	Paul Menage <menage@...gle.com>,
	Li Zefan <lizf@...fujitsu.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Dan Malek <dan@...eddedalley.com>,
	Vladislav Buzov <vbuzov@...eddedalley.com>,
	Daisuke Nishimura <nishimura@....nes.nec.co.jp>,
	Alexander Shishkin <virtuoso@...nd.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/4] cgroup notifications API and memory thresholds

* Kirill A. Shutemov <kirill@...temov.name> [2009-12-30 17:57:55]:

> This patchset introduces eventfd-based API for notifications in cgroups and
> implements memory notifications on top of it.
> 
> It uses statistics in memory controler to track memory usage.
> 
> Output of time(1) on building kernel on tmpfs:
> 
> Root cgroup before changes:
> 	make -j2  506.37 user 60.93s system 193% cpu 4:52.77 total
> Non-root cgroup before changes:
> 	make -j2  507.14 user 62.66s system 193% cpu 4:54.74 total
> Root cgroup after changes (0 thresholds):
> 	make -j2  507.13 user 62.20s system 193% cpu 4:53.55 total
> Non-root cgroup after changes (0 thresholds):
> 	make -j2  507.70 user 64.20s system 193% cpu 4:55.70 total
> Root cgroup after changes (1 thresholds, never crossed):
> 	make -j2  506.97 user 62.20s system 193% cpu 4:53.90 total
> Non-root cgroup after changes (1 thresholds, never crossed):
> 	make -j2  507.55 user 64.08s system 193% cpu 4:55.63 total
> 
> Any comments?

Hi,

I just saw that the notification work for me using the tool you
supplied. One strange thing was that I got notified even though
the amount of data I was using was reducing, so I hit the notification
two ways

        +------------+-----------
                    1G
                ----> (got notified on increase)
                <---- (got notified on decrease)

I am not against the behaviour, but it can be confusing unless
clarified with the event.

-- 
	Balbir
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