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

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Message-ID: <20130626075921.GD28748@dhcp22.suse.cz>
Date:	Wed, 26 Jun 2013 09:59:21 +0200
From:	Michal Hocko <mhocko@...e.cz>
To:	Minchan Kim <minchan@...nel.org>
Cc:	Luiz Capitulino <lcapitulino@...hat.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, anton@...msg.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH] vmpressure: implement strict mode

On Wed 26-06-13 16:50:51, Minchan Kim wrote:
> On Tue, Jun 25, 2013 at 05:51:29PM -0400, Luiz Capitulino wrote:
> > Currently, applications are notified for the level they registered for
> > _plus_ higher levels.
> > 
> > This is a problem if the application wants to implement different
> > actions for different levels. For example, an application might want
> > to release 10% of its cache on level low, 50% on medium and 100% on
> > critical. To do this, the application has to register a different fd
> > for each event. However, fd low is always going to be notified and
> > and all fds are going to be notified on level critical.
> > 
> > Strict mode solves this problem by strictly notifiying the event
> > an fd has registered for. It's optional. By default we still notify
> > on higher levels.
> > 
> > Signed-off-by: Luiz Capitulino <lcapitulino@...hat.com>
> Acked-by: Minchan Kim <minchan@...nel.org>
> 
> Shouldn't we make this default?

The interface is not there for long but still, changing it is always
quite tricky. And the users who care can be modified really easily so I
would stick with the original default.

-- 
Michal Hocko
SUSE Labs
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