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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

  parent reply	other threads:[~2007-08-03 19:19 UTC|newest]

Thread overview: 33+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-08-03 18:37 [PATCH] msleep() with hrtimers Jonathan Corbet
2007-08-03 18:54 ` Ingo Molnar
2007-08-03 19:19 ` Roman Zippel [this message]
2007-08-03 19:46   ` Arjan van de Ven
2007-08-03 19:58     ` Roman Zippel
2007-08-03 23:53       ` Arjan van de Ven
2007-08-04  3:00         ` Roman Zippel
2007-08-04 19:19           ` Arjan van de Ven
2007-08-06  0:09             ` Roman Zippel
2007-08-06  0:43               ` Arjan van de Ven
2007-08-06  1:03                 ` Roman Zippel
2007-08-06  5:39                   ` Arjan van de Ven
2007-08-06 10:03                     ` Roman Zippel
2007-08-06 10:20                       ` Manu Abraham
2007-08-06 15:53                       ` Arjan van de Ven
2007-08-07 10:40                         ` Manu Abraham
2007-08-07 12:45                         ` Roman Zippel
2007-08-08  4:15                           ` Arjan van de Ven
2007-08-09 19:31                             ` Denis Vlasenko
2007-08-09 20:01                               ` Denis Vlasenko
2007-08-07 19:40 ` Andrew Morton
2007-08-07 23:16   ` Roman Zippel
2007-08-07 23:29     ` Andrew Morton
2007-08-08  3:47       ` Roman Zippel
2007-08-08  4:14         ` Andrew Morton
2007-08-09 22:31           ` Roman Zippel
2007-08-08 11:55   ` Andi Kleen
2007-08-08 11:09     ` Manu Abraham
2007-08-08 11:52       ` Andi Kleen
2007-08-08 11:59         ` Manu Abraham
2007-08-09  7:16 ` Andrew Morton
2007-08-09 15:08   ` [linux-usb-devel] " Alan Stern
2007-11-28 10:29 ` Andrew Morton

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