linux-kernel - Re: [PATCH v2] vmpressure: implement strict mode

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Message-ID: <20130628144507.37d28ed9@redhat.com>
Date:	Fri, 28 Jun 2013 14:45:07 -0400
From:	Luiz Capitulino <lcapitulino@...hat.com>
To:	Anton Vorontsov <anton@...msg.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Minchan Kim <minchan@...nel.org>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, mhocko@...e.cz, kmpark@...radead.org,
	hyunhee.kim@...sung.com
Subject: Re: [PATCH v2] vmpressure: implement strict mode

On Fri, 28 Jun 2013 10:09:17 -0700
Anton Vorontsov <anton@...msg.org> wrote:

> So, I would now argue that the current scheme is perfectly OK and can do
> everything you can do with the "strict" one,

I forgot commenting this bit. This is not true, because I don't want a
low fd to be notified on critical level. The current interface just
can't do that.

However, it *is* possible to make non-strict work on strict if we make
strict default _and_ make reads on memory.pressure_level return
available events. Just do this on app initialization:

for each event in memory.pressure_level; do
	/* register eventfd to be notified on "event" */
done

Then eventfd will always be notified, no matter the event.
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