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

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Message-ID: <20130628050712.GA10097@teo>
Date:	Thu, 27 Jun 2013 22:07:12 -0700
From:	Anton Vorontsov <anton@...msg.org>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	Minchan Kim <minchan@...nel.org>,
	Luiz Capitulino <lcapitulino@...hat.com>, 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 Thu, Jun 27, 2013 at 09:34:11PM -0700, Anton Vorontsov wrote:
> ... we can add the strict mode and deprecate the
> "filtering" -- basically we'll implement the idea of requiring that
> userspace registers a separate fd for each level.

Btw, assuming that more levels can be added, there will be a problem:
imagine that an app hooked up onto low, med, crit levels in "strict"
mode... then once we add a new level, the app will start missing the new
level events.

In the old scheme it is not a problem because of the >= condition.

With a proper versioning this won't be a problem for a new scheme too.

Anton
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