From: Linus Torvalds <torvalds@linux-foundation.org>
To: Ingo Molnar <mingo@elte.hu>
Cc: Ian Kent <raven@themaw.net>,
davids@webmaster.com,
"Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>,
Chuck Ebbert <cebbert@redhat.com>,
Bill Davidsen <davidsen@tmr.com>,
Thomas Gleixner <tglx@linutronix.de>
Subject: Re: [patch] CFS scheduler, -v19
Date: Wed, 18 Jul 2007 10:23:17 -0700 (PDT) [thread overview]
Message-ID: <alpine.LFD.0.999.0707181019570.27353@woody.linux-foundation.org> (raw)
In-Reply-To: <20070718075417.GA7895@elte.hu>
On Wed, 18 Jul 2007, Ingo Molnar wrote:
>
> Linus, Thomas, what do you think, should we keep the time.c change?
No, not if it's off by the second field. That 30% CPU usage indicates that
there's some nasty bug there somewhere, and that's just not worth it.
If time() cannot get the second field right, it's bogus. I'm ok with us
not *guaranteeing* monotonicity of the second field when you compare
gettimeofday() with time(), but the 30% thing implies that it's much worse
than that, and that "time()" will likely report the previous second (when
compared to hrtimers) roughly a quarter of the time.
And that isn't acceptable.
So either it should be fixed, or reverted.
Linus
next prev parent reply other threads:[~2007-07-18 17:24 UTC|newest]
Thread overview: 66+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-07-06 17:33 Ingo Molnar
2007-07-08 17:46 ` Willy Tarreau
2007-07-09 22:39 ` Ingo Molnar
2007-07-17 21:44 ` Willy Tarreau
2007-07-10 8:08 ` Mike Galbraith
2007-07-11 17:26 ` Bill Davidsen
2007-07-11 20:55 ` Ingo Molnar
2007-07-12 12:41 ` Bill Davidsen
2007-07-13 21:19 ` Bill Davidsen
2007-07-16 21:34 ` Chuck Ebbert
2007-07-16 21:55 ` Ingo Molnar
2007-07-17 4:22 ` Bill Davidsen
2007-07-17 5:01 ` Ian Kent
2007-07-17 7:45 ` Ingo Molnar
2007-07-17 11:17 ` Ian Kent
2007-07-17 17:16 ` Ingo Molnar
2007-07-18 1:24 ` Bill Davidsen
2007-07-18 6:19 ` Ian Kent
2007-07-17 16:30 ` Chuck Ebbert
2007-07-17 21:16 ` David Schwartz
2007-07-18 5:59 ` Ian Kent
2007-07-18 7:54 ` Ingo Molnar
2007-07-18 13:50 ` Bill Davidsen
2007-07-18 17:23 ` Linus Torvalds [this message]
2007-07-18 16:03 ` Linus Torvalds
2007-07-18 17:31 ` Ian Kent
2007-07-18 21:37 ` Bill Davidsen
2007-07-19 8:53 ` Ingo Molnar
2007-07-19 14:32 ` Ingo Molnar
2007-07-19 17:06 ` Bill Davidsen
2007-07-19 17:10 ` Ingo Molnar
2007-07-19 17:17 ` Ingo Molnar
2007-07-19 17:26 ` Bill Davidsen
2007-07-19 17:42 ` Ingo Molnar
2007-07-20 2:32 ` Bill Davidsen
2007-07-19 8:16 ` Ingo Molnar
2007-07-14 11:34 ` Markus
2007-07-14 15:11 ` Markus
2007-07-16 9:41 ` Ingo Molnar
2007-07-16 17:59 ` Markus
2007-07-17 7:37 ` Ingo Molnar
2007-07-17 13:06 ` Markus
2007-07-17 17:06 ` Ingo Molnar
2007-07-17 17:13 ` Ingo Molnar
2007-07-17 19:42 ` Markus
2007-07-17 20:09 ` Ingo Molnar
2007-07-17 20:37 ` Linus Torvalds
2007-07-17 20:43 ` Ingo Molnar
2007-07-17 22:03 ` Markus
2007-07-20 22:26 ` Markus
2007-07-22 11:59 ` konqueror suddenly vanishing, "konqueror: Fatal IO error: client killed" Ingo Molnar
2007-07-22 14:26 ` Markus
2007-08-09 17:34 ` [patch] CFS scheduler, -v19 Markus
2007-08-10 7:46 ` Ingo Molnar
2007-08-14 17:15 ` Markus
2007-10-17 0:02 ` Markus
2007-07-14 17:19 ` Ed Tomlinson
2007-07-15 5:25 ` Mike Galbraith
2007-07-15 12:53 ` Markus
2007-07-15 19:46 ` Mike Galbraith
2007-07-15 21:11 ` Markus
2007-07-16 6:42 ` Mike Galbraith
2007-07-16 8:00 ` Ingo Molnar
2007-07-16 9:17 ` Ingo Molnar
2007-07-16 11:10 ` Ed Tomlinson
2007-07-08 20:51 Al Boldi
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