linux-kernel - Re: [GIT PULL] scheduler changes for v3.10

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Message-ID: <20130430162300.GB28821@gmail.com>
Date:	Tue, 30 Apr 2013 18:23:00 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Fr?d?ric Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [GIT PULL] scheduler changes for v3.10


* Stanislaw Gruszka <sgruszka@...hat.com> wrote:

> On Tue, Apr 30, 2013 at 07:49:43AM -0700, Linus Torvalds wrote:
> > On Mon, Apr 29, 2013 at 11:58 PM, Ingo Molnar <mingo@...nel.org> wrote:
> > >
> > > Please pull the latest sched-core-for-linus git tree from:
> > >
> > > The main changes in this development cycle were:
> > >
> > >   - full dynticks preparatory work by Frederic Weisbecker
> > 
> > Why does this have the crappy cputime scaling overflow code, when we
> > had a long thread about how to do it right *without* any 64-bit
> > divides, including a quality-tested patch?
> > 
> > This still has the garbage "div64_u64_rem()" crap which actually SLOWS
> > DOWN 32-bit code even when not used (becuse it makes "div64_u64()"
> > calculate it even when unnecessary.
> > 
> > WTF happened here? I and others spent efforts so that we wouldn't need
> > this kind of crap.
> 
> I'm sorry, I was on vacations and has some other work to do, so I didn't
> send patches in timely manner. I just posted them today.

Linus, would you like me to revert d9a3c9823a2e and re-send the pull 
request?

I intended to queue up Stanislaw's fixes in sched/urgent as the real 
solution, but they arrived earlier today and are too fresh.

Thanks,

	Ingo
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