linux-kernel - Re: [PATCH v4] vmevent: Implement greater-than attribute state and one-shot mode

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Message-ID: <4FA04FD5.6010900@redhat.com>
Date:	Tue, 01 May 2012 17:04:21 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Anton Vorontsov <anton.vorontsov@...aro.org>
CC:	Pekka Enberg <penberg@...nel.org>,
	Leonid Moiseichuk <leonid.moiseichuk@...ia.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 v4] vmevent: Implement greater-than attribute state and
 one-shot mode

On 05/01/2012 09:18 AM, Anton Vorontsov wrote:
> This patch implements a new event type, it will trigger whenever a
> value becomes greater than user-specified threshold, it complements
> the 'less-then' trigger type.
>
> Also, let's implement the one-shot mode for the events, when set,
> userspace will only receive one notification per crossing the
> boundaries.
>
> Now when both LT and GT are set on the same level, the event type
> works as a cross event type: it triggers whenever a value crosses
> the threshold from a lesser values side to a greater values side,
> and vice versa.
>
> We use the event types in an userspace low-memory killer: we get a
> notification when memory becomes low, so we start freeing memory by
> killing unneeded processes, and we get notification when memory hits
> the threshold from another side, so we know that we freed enough of
> memory.

How are these vmevents supposed to work with cgroups?

What do we do when a cgroup nears its limit, and there
is no more swap space available?

What do we do when a cgroup nears its limit, and there
is swap space available?

It would be nice to be able to share the same code for
embedded, desktop and server workloads...

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