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Re: [PATCH] bitops: simplify generic bit finding functions

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From: Andi Kleen <andi@...>
To: Linus Torvalds <torvalds@...>
Cc: Thomas Gleixner <tglx@...>, Harvey Harrison <harvey.harrison@...>, Ingo Molnar <mingo@...>, Andrew Morton <akpm@...>, LKML <linux-kernel@...>, David Miller <davem@...>
Subject: Re: [PATCH] bitops: simplify generic bit finding functions
Date: Monday, April 28, 2008 - 3:57 pm

Linus Torvalds <torvalds@linux-foundation.org> writes:

A long time ago during profiling I found that in the scheduler back then
for_each_cpu() with find_next_bit() was somewhat hot. But I'm not sure it 
still would be in the new scheduler anyways and the test case a little
dumb anyways (overscheduling user space)

Still I think for_each_cpu() should be reasonably stream lined code.

-Andi
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Messages in current thread:
[PATCH] bitops: simplify generic bit finding functions, Harvey Harrison, (Sun Apr 27, 4:19 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Alexander van Heukelum, (Mon Apr 28, 10:32 am)
Re: [PATCH] bitops: simplify generic bit finding functions, Linus Torvalds, (Sun Apr 27, 4:26 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Alexander van Heukelum, (Mon Apr 28, 10:58 am)
Re: [PATCH] bitops: simplify generic bit finding functions, Thomas Gleixner, (Mon Apr 28, 10:04 am)
Re: [PATCH] bitops: simplify generic bit finding functions, Linus Torvalds, (Mon Apr 28, 12:25 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Thomas Gleixner, (Mon Apr 28, 12:47 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Linus Torvalds, (Mon Apr 28, 12:54 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Andi Kleen, (Mon Apr 28, 3:57 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Thomas Gleixner, (Mon Apr 28, 3:26 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Linus Torvalds, (Mon Apr 28, 3:37 pm)
[PATCH] bitops: remove "optimizations", Thomas Gleixner, (Tue Apr 29, 6:01 am)
Re: [PATCH] bitops: remove "optimizations", David Miller, (Tue Apr 29, 6:03 am)
Re: [PATCH] bitops: remove "optimizations", David Miller, (Tue Apr 29, 8:34 am)
Re: [PATCH] bitops: remove "optimizations", Thomas Gleixner, (Tue Apr 29, 12:51 pm)
Re: [PATCH] bitops: remove "optimizations", David Miller, (Tue Apr 29, 6:58 pm)
Re: [PATCH] bitops: remove "optimizations", David Miller, (Tue Apr 29, 7:30 pm)
Re: [PATCH] bitops: remove "optimizations", Ingo Molnar, (Tue Apr 29, 10:20 am)
Re: [PATCH] bitops: remove "optimizations", David Miller, (Tue Apr 29, 6:31 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Ingo Molnar, (Mon Apr 28, 5:55 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Alexander van Heukelum, (Mon Apr 28, 11:10 am)
Re: [PATCH] bitops: simplify generic bit finding functions, Thomas Gleixner, (Mon Apr 28, 11:58 am)
Re: [PATCH] bitops: simplify generic bit finding functions, Harvey Harrison, (Sun Apr 27, 4:29 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Linus Torvalds, (Sun Apr 27, 4:38 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Al Viro, (Sun Apr 27, 5:02 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Al Viro, (Sun Apr 27, 4:36 pm)
Re: [PATCH] bitops: simplify generic bit finding functions, Harvey Harrison, (Sun Apr 27, 4:38 pm)