Re: [PATCH] msleep() with hrtimers

From: Roman Zippel <zippel@linux-m68k.org>
To: Jonathan Corbet <corbet@lwn.net>
Cc: linux-kernel@vger.kernel.org,
	Thomas Gleixner <tglx@linutronix.de>,
	akpm@linux-foundation.org, Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH] msleep() with hrtimers
Date: Fri, 3 Aug 2007 21:19:36 +0200 (CEST)	[thread overview]
Message-ID: <Pine.LNX.4.64.0708032116340.1817@scrub.home> (raw)
In-Reply-To: <15327.1186166232@lwn.net>

Hi,

On Fri, 3 Aug 2007, Jonathan Corbet wrote:

> Most comments last time were favorable.  The one dissenter was Roman,
> who worries about the overhead of using hrtimers for this operation; my
> understanding is that he would rather see a really_msleep() function for
> those who actually want millisecond resolution.  I'm not sure how to
> characterize what the cost could be, but it can only be buried by the
> fact that every call sleeps for some number of milliseconds.  On my
> system, the several hundred total msleep() calls can't cause any real
> overhead, and almost all happen at initialization time.

The main point is still that these are two _different_ APIs for different 
usages, so I still prefer to add a hrsleep() instead.

bye, Roman