linux-kernel - Re: [PATCH] msleep() with hrtimers

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite for Android: free password hash cracker in your pocket

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <1186170407.3153.8.camel@laptopd505.fenrus.org>
Date:	Fri, 03 Aug 2007 12:46:46 -0700
From:	Arjan van de Ven <arjan@...radead.org>
To:	Roman Zippel <zippel@...ux-m68k.org>
Cc:	Jonathan Corbet <corbet@....net>, linux-kernel@...r.kernel.org,
	Thomas Gleixner <tglx@...utronix.de>,
	akpm@...ux-foundation.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH] msleep() with hrtimers

On Fri, 2007-08-03 at 21:19 +0200, Roman Zippel wrote:
> 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.


I would actually prefer it the other way around; call the
not-so-accurate one "msleep_approx()" or somesuch, to make it explicit
that the sleep is only approximate...


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/