From: Thomas Gleixner <tglx@linutronix.de>
To: Roman Zippel <zippel@linux-m68k.org>
Cc: Ingo Molnar <mingo@elte.hu>,
Christopher Friesen <cfriesen@nortel.com>,
linux-kernel@vger.kernel.org, akpm@osdl.org, george@mvista.com,
johnstul@us.ibm.com, paulmck@us.ibm.com
Subject: Re: [ANNOUNCE] ktimers subsystem
Date: Sun, 25 Sep 2005 23:00:05 +0200 [thread overview]
Message-ID: <1127682006.15115.96.camel@tglx.tec.linutronix.de> (raw)
In-Reply-To: <Pine.LNX.4.61.0509250052390.3728@scrub.home>
On Sun, 2005-09-25 at 01:45 +0200, Roman Zippel wrote:
> > The backward conversion from nsec_t to timespec is almost a non issue.
> > The vast majority of callers dont provide the second argument to
> > nanosleep(), setitimer(), set_timer() which makes the conversion
> > necessary and I think we optimize for the common use case.
>
> You know very well, that the conversion back to timespec is the killer in
> your calculation. You graciously decide that the "vast majority" doesn't
> want to read the timer, how did you get to that conclusion?
I graciously put instrumentation into _all_ the relevant syscalls on a
desktop and a server machine. The result is that less than 1% of the
calls provide the read back variable.
tglx
next prev parent reply other threads:[~2005-09-25 20:59 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-19 16:48 [ANNOUNCE] ktimers subsystem tglx
2005-09-19 16:48 ` [PATCH] " tglx
2005-09-19 21:47 ` [ANNOUNCE] " Thomas Gleixner
2005-09-19 22:03 ` Christoph Lameter
2005-09-19 22:17 ` Thomas Gleixner
2005-09-19 22:24 ` Christoph Lameter
2005-09-19 22:44 ` Thomas Gleixner
2005-09-19 22:50 ` john stultz
2005-09-19 22:58 ` Thomas Gleixner
2005-09-19 23:04 ` Christoph Lameter
2005-09-19 23:12 ` Thomas Gleixner
2005-09-20 7:14 ` Ingo Molnar
2005-09-20 7:10 ` Ingo Molnar
2005-09-21 19:24 ` Pavel Machek
2005-09-19 22:39 ` Christopher Friesen
2005-09-19 22:54 ` Thomas Gleixner
2005-09-20 4:57 ` Christopher Friesen
2005-09-20 5:11 ` Thomas Gleixner
2005-09-20 0:43 ` George Anzinger
2005-09-21 19:50 ` Roman Zippel
2005-09-21 22:41 ` Thomas Gleixner
2005-09-22 12:59 ` Ingo Molnar
2005-09-22 23:09 ` Roman Zippel
2005-09-22 23:31 ` Christopher Friesen
2005-09-23 0:25 ` Roman Zippel
2005-09-23 6:49 ` Thomas Gleixner
2005-09-24 3:15 ` Roman Zippel
2005-09-24 5:16 ` Ingo Molnar
2005-09-24 10:35 ` Roman Zippel
2005-09-24 13:56 ` Thomas Gleixner
2005-09-24 16:51 ` Daniel Walker
2005-09-24 23:45 ` Roman Zippel
2005-09-25 21:00 ` Thomas Gleixner [this message]
2005-09-27 16:54 ` Roman Zippel
2005-09-27 19:03 ` Tim Bird
2005-09-28 16:36 ` Roman Zippel
2005-09-25 21:02 ` Thomas Gleixner
2005-09-27 16:48 ` Roman Zippel
2005-09-27 18:38 ` Tim Bird
2005-09-27 20:36 ` George Anzinger
2005-09-23 2:25 ` john stultz
2005-09-23 8:27 ` Thomas Gleixner
2005-09-24 2:43 ` Roman Zippel
2005-09-24 5:03 ` Ingo Molnar
2005-09-24 9:04 ` James Bruce
2005-09-23 15:21 ` Paul E. McKenney
2005-09-24 3:38 ` Roman Zippel
2005-09-25 15:48 Sid Boyce
2005-09-25 18:20 ` Zwane Mwaikambo
2005-09-26 0:02 ` Sid Boyce
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