linux-kernel - Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

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Message-ID: <p73tzvg56ag.fsf@bingen.suse.de>
Date:	17 Apr 2007 00:00:07 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [Announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]

Ingo Molnar <mingo@...e.hu> writes:

> [announce] [patch] Modular Scheduler Core and Completely Fair Scheduler [CFS]
> 
> i'm pleased to announce the first release of the "Modular Scheduler Core
> and Completely Fair Scheduler [CFS]" patchset:
> 
>    http://redhat.com/~mingo/cfs-scheduler/sched-modular+cfs.patch

I would suggest to drop the tsc.c change. The "small errors" can be
really large on some systems and you can also see large backward jumps.
I have a proper (but complicated) solution pending
in ftp://ftp.firstfloor.org/pub/ak/x86_64/quilt/sched-clock-share

BTW with all this CPU time measurement it would be really nice to
report it to the user too. It seems a bit bizarre that the scheduler
keeps track of ns, but top only knows jiffies with large sampling errors.

-Andi
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