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Re: [patch] CFS scheduler, -v19

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From: Linus Torvalds <torvalds@...>
To: Ingo Molnar <mingo@...>
Cc: Ian Kent <raven@...>, <davids@...>, Linux-Kernel@Vger. Kernel. Org <linux-kernel@...>, Chuck Ebbert <cebbert@...>, Bill Davidsen <davidsen@...>, Thomas Gleixner <tglx@...>
Subject: Re: [patch] CFS scheduler, -v19
Date: Wednesday, July 18, 2007 - 1:23 pm

On Wed, 18 Jul 2007, Ingo Molnar wrote:

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
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Messages in current thread:
[patch] CFS scheduler, -v19, Ingo Molnar, (Fri Jul 6, 1:33 pm)
Re: [patch] CFS scheduler, -v19, Ed Tomlinson, (Sat Jul 14, 1:19 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Mon Jul 16, 5:17 am)
Re: [patch] CFS scheduler, -v19, Ed Tomlinson, (Mon Jul 16, 7:10 am)
Re: [patch] CFS scheduler, -v19, Mike Galbraith, (Sun Jul 15, 1:25 am)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Mon Jul 16, 4:00 am)
Re: [patch] CFS scheduler, -v19, Markus, (Sun Jul 15, 8:53 am)
Re: [patch] CFS scheduler, -v19, Mike Galbraith, (Sun Jul 15, 3:46 pm)
Re: [patch] CFS scheduler, -v19, Markus, (Sun Jul 15, 5:11 pm)
Re: [patch] CFS scheduler, -v19, Mike Galbraith, (Mon Jul 16, 2:42 am)
Re: [patch] CFS scheduler, -v19, Markus, (Sat Jul 14, 7:34 am)
Re: [patch] CFS scheduler, -v19, Markus, (Sat Jul 14, 11:11 am)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Mon Jul 16, 5:41 am)
Re: [patch] CFS scheduler, -v19, Markus, (Mon Jul 16, 1:59 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Tue Jul 17, 3:37 am)
Re: [patch] CFS scheduler, -v19, Markus, (Tue Jul 17, 9:06 am)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Tue Jul 17, 1:06 pm)
Re: [patch] CFS scheduler, -v19, Markus, (Tue Jul 17, 3:42 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Tue Jul 17, 4:09 pm)
Re: [patch] CFS scheduler, -v19, Linus Torvalds, (Tue Jul 17, 4:37 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Tue Jul 17, 4:43 pm)
Re: [patch] CFS scheduler, -v19, Markus, (Tue Oct 16, 8:02 pm)
Re: [patch] CFS scheduler, -v19, Markus, (Thu Aug 9, 1:34 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Fri Aug 10, 3:46 am)
Re: [patch] CFS scheduler, -v19, Markus, (Tue Aug 14, 1:15 pm)
Re: [patch] CFS scheduler, -v19, Markus, (Fri Jul 20, 6:26 pm)
Re: konqueror suddenly vanishing, "konqueror: Fatal IO error..., Ingo Molnar, (Sun Jul 22, 7:59 am)
Re: konqueror suddenly vanishing, "konqueror: Fatal IO error..., Markus, (Sun Jul 22, 10:26 am)
Re: [patch] CFS scheduler, -v19, Markus, (Tue Jul 17, 6:03 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Tue Jul 17, 1:13 pm)
Re: [patch] CFS scheduler, -v19, Mike Galbraith, (Tue Jul 10, 4:08 am)
Re: [patch] CFS scheduler, -v19, Bill Davidsen, (Wed Jul 11, 1:26 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Wed Jul 11, 4:55 pm)
Re: [patch] CFS scheduler, -v19, Bill Davidsen, (Fri Jul 13, 5:19 pm)
Re: [patch] CFS scheduler, -v19, Chuck Ebbert, (Mon Jul 16, 5:34 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Mon Jul 16, 5:55 pm)
Re: [patch] CFS scheduler, -v19, Ian Kent, (Tue Jul 17, 1:01 am)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Tue Jul 17, 3:45 am)
Re: [patch] CFS scheduler, -v19, Linus Torvalds, (Wed Jul 18, 12:03 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Thu Jul 19, 4:16 am)
Re: [patch] CFS scheduler, -v19, Bill Davidsen, (Wed Jul 18, 5:37 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Thu Jul 19, 10:32 am)
Re: [patch] CFS scheduler, -v19, Bill Davidsen, (Thu Jul 19, 10:32 pm)
Re: [patch] CFS scheduler, -v19, Bill Davidsen, (Thu Jul 19, 1:06 pm)
Re: [patch] CFS scheduler, -v19, Bill Davidsen, (Thu Jul 19, 1:26 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Thu Jul 19, 1:42 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Thu Jul 19, 1:17 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Thu Jul 19, 1:10 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Thu Jul 19, 4:53 am)
Re: [patch] CFS scheduler, -v19, Ian Kent, (Wed Jul 18, 1:31 pm)
RE: [patch] CFS scheduler, -v19, David Schwartz, (Tue Jul 17, 5:16 pm)
RE: [patch] CFS scheduler, -v19, Ian Kent, (Wed Jul 18, 1:59 am)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Wed Jul 18, 3:54 am)
Re: [patch] CFS scheduler, -v19, Linus Torvalds, (Wed Jul 18, 1:23 pm)
Re: [patch] CFS scheduler, -v19, Bill Davidsen, (Wed Jul 18, 9:50 am)
Re: [patch] CFS scheduler, -v19, Chuck Ebbert, (Tue Jul 17, 12:30 pm)
Re: [patch] CFS scheduler, -v19, Ian Kent, (Tue Jul 17, 7:17 am)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Tue Jul 17, 1:16 pm)
Re: [patch] CFS scheduler, -v19, Bill Davidsen, (Tue Jul 17, 9:24 pm)
Re: [patch] CFS scheduler, -v19, Ian Kent, (Wed Jul 18, 2:19 am)
Re: [patch] CFS scheduler, -v19, Bill Davidsen, (Tue Jul 17, 12:22 am)
Re: [patch] CFS scheduler, -v19, Bill Davidsen, (Thu Jul 12, 8:41 am)
Re: [patch] CFS scheduler, -v19, Willy Tarreau, (Sun Jul 8, 1:46 pm)
Re: [patch] CFS scheduler, -v19, Ingo Molnar, (Mon Jul 9, 6:39 pm)
Re: [patch] CFS scheduler, -v19, Willy Tarreau, (Tue Jul 17, 5:44 pm)