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[patch] CFS scheduler, -v18

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From: Ingo Molnar
Subject: [patch] CFS scheduler, -v18
Date: Friday, June 22, 2007 - 3:02 pm

i'm pleased to announce release -v18 of the CFS scheduler patchset.

The rolled-up CFS patch against today's -git kernel, v2.6.22-rc5, 
v2.6.22-rc4-mm2, v2.6.21.5 or v2.6.20.14 can be downloaded from the 
usual place:

   http://people.redhat.com/mingo/cfs-scheduler/

The biggest change in -v18 are various performance related improvements. 
Thomas Gleixner has eliminated expensive 64-bit divisions by converting 
the arithmetics to scaled math (without impacting the quality of 
calculations). Srivatsa Vaddagiri and Dmitry Adamushko have continued 
the abstraction and cleanup work. Srivatsa Vaddagiri and Christoph 
Lameter fixed the NUMA balancing bug reported by Paul McKenney. There 
were also a good number of other refinements to the CFS code. (No 
reproducible behavioral regressions were reported against -v17 so far, 
so the 'behavioral' bits are mostly unchanged.)
 
Changes since -v17:

 - implement scaled math speedups for CFS. (Thomas Gleixner)

 - lots of core code updates, cleanups and streamlining.
   (Srivatsa Vaddagiri, Dmitry Adamushko, me.)

 - bugfix: fix NUMA balancing. (Srivatsa Vaddagiri, Christoph Lameter,
   Paul E. McKenney)

 - feature: SCHED_IDLE now also implies block-scheduler (CFQ)
   idle-IO-priority. (suggested by Thomas Sattler, picked up from -ck)

 - build fix for ppc32. (reported, tested and confirmed fixed by
   Art Haas)

 - ARM fix. (reported and debugged by Thomas Gleixner)

 - cleanup: implemented idle_sched_class in kernel/sched_idletask.c as a
   way to separate out rq->idle handling out of the core scheduler. This
   made a good deal of idle-task related special-cases go away.

 - debug: make the sysctls safer by introducing high and low limits.

 - cleanup: move some of the debug counters to under CONFIG_SCHEDSTATS.

 - speedup: various micro-optimizations

 - various other small updates.

As usual, any sort of feedback, bugreport, fix and suggestion is more 
than welcome!
   
	Ingo
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Messages in current thread:
[patch] CFS scheduler, -v18, Ingo Molnar, (Fri Jun 22, 3:02 pm)
Re: [patch] CFS scheduler, -v18, S.Çağlar, (Fri Jun 22, 3:09 pm)
Re: [patch] CFS scheduler, -v18, S.Çağlar, (Fri Jun 22, 3:16 pm)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Fri Jun 22, 3:20 pm)
Re: [patch] CFS scheduler, -v18, Gene Heskett, (Fri Jun 22, 4:08 pm)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Sat Jun 23, 12:11 am)
Re: [patch] CFS scheduler, -v18, Gene Heskett, (Sat Jun 23, 2:55 am)
Re: [patch] CFS scheduler, -v18, Antonino Ingargiola, (Sat Jun 23, 3:22 am)
Re: [patch] CFS scheduler, -v18, Willy Tarreau, (Sat Jun 23, 6:24 am)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Sat Jun 23, 10:25 am)
Re: [patch] CFS scheduler, -v18, Antonino Ingargiola, (Sun Jun 24, 3:02 am)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Sun Jun 24, 4:07 am)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Sun Jun 24, 8:52 am)
Re: [patch] CFS scheduler, -v18, Willy Tarreau, (Sun Jun 24, 10:08 am)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Sun Jun 24, 1:31 pm)
Re: [patch] CFS scheduler, -v18, Antonino Ingargiola, (Mon Jun 25, 12:27 am)
Re: [patch] CFS scheduler, -v18, Andrew Morton, (Mon Jun 25, 8:02 pm)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Tue Jun 26, 1:38 am)
Re: [patch] CFS scheduler, -v18, Andrew Morton, (Tue Jun 26, 2:00 am)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Tue Jun 26, 2:38 am)
RE: [patch] CFS scheduler, -v18, Fortier,Vincent [Mon ..., (Tue Jun 26, 1:17 pm)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Wed Jun 27, 3:51 am)
Re: [patch] CFS scheduler, -v18, Willy Tarreau, (Sat Jun 30, 2:06 pm)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Sun Jul 1, 1:31 am)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Sun Jul 1, 1:45 am)
Re: [patch] CFS scheduler, -v18, Willy Tarreau, (Sun Jul 1, 2:00 am)
Re: [patch] CFS scheduler, -v18, Vegard Nossum, (Mon Jul 2, 4:44 am)
Re: [patch] CFS scheduler, -v18, Dmitry Adamushko, (Mon Jul 2, 6:01 am)
Re: [patch] CFS scheduler, -v18, Vegard Nossum, (Mon Jul 2, 6:43 am)
Re: [patch] CFS scheduler, -v18, Bill Davidsen, (Mon Jul 2, 7:13 am)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Mon Jul 2, 8:50 am)
Re: [patch] CFS scheduler, -v18, Vegard Nossum, (Mon Jul 2, 9:40 am)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Mon Jul 2, 11:13 am)
Re: [patch] CFS scheduler, -v18, Vegard Nossum, (Tue Jul 3, 12:01 am)
Re: [patch] CFS scheduler, -v18, Mike Galbraith, (Tue Jul 3, 12:12 am)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Tue Jul 3, 12:15 am)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Tue Jul 3, 12:22 am)
Re: [patch] CFS scheduler, -v18, Keith Packard, (Tue Jul 3, 1:08 am)
Re: [patch] CFS scheduler, -v18, Ingo Molnar, (Tue Jul 3, 1:31 am)
Re: [patch] CFS scheduler, -v18, Vegard Nossum, (Tue Jul 3, 2:11 am)
Re: [patch] CFS scheduler, -v18, Andi Kleen, (Wed Jul 4, 5:11 am)