linux-kernel - Re: [PATCH, v7] cgroups: introduce timer slack controller

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Message-ID: <1299265422.22521.2.camel@laptop>
Date:	Fri, 04 Mar 2011 20:03:42 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Kirill A. Shutsemov" <kirill@...temov.name>
Cc:	Paul Menage <menage@...gle.com>, Li Zefan <lizf@...fujitsu.com>,
	containers@...ts.linux-foundation.org,
	jacob.jun.pan@...ux.intel.com,
	Arjan van de Ven <arjan@...ux.intel.com>,
	linux-kernel@...r.kernel.org, Matt Helsley <matthltc@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-api@...r.kernel.org
Subject: Re: [PATCH, v7] cgroups: introduce timer slack controller

On Wed, 2011-03-02 at 18:40 +0200, Kirill A. Shutsemov wrote:
> -       if (ret < current->timer_slack_ns)
> -               return current->timer_slack_ns;
> -       return ret;
> +       return clamp(__estimate_accuracy(&now),
> +                       get_task_timer_slack(current), LONG_MAX);

That actually makes the code worse, how about:

  min(__estimate_accuracy(), get_task_timer_slack()) ?



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