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

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Message-ID: <20130430163032.GA3999@gmail.com>
Date:	Tue, 30 Apr 2013 18:30:32 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Stanislaw Gruszka <sgruszka@...hat.com>,
	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


* Linus Torvalds <torvalds@...ux-foundation.org> wrote:

> On Tue, Apr 30, 2013 at 9:23 AM, Ingo Molnar <mingo@...nel.org> wrote:
> >
> > Linus, would you like me to revert d9a3c9823a2e and re-send the pull
> > request?
> 
> I took the pull request, but I'd like to see the non-64-bit divide 
> version before the merge window ends. [...]

Yeah, wanted to apply it later today or tomorrow, and push it to you this 
week - well before the end of the merge window.

> [...] And with no more div_rem users I think we should at least 
> double-check that the new div64_u64() (that uses the new div64_u64_rem) 
> isn't noticeably slower than the old one. If it is, we should revert 
> that new (and then unused) div64 code too.

Correct, this is what Stanislaw's series from earlier today does:

 [PATCH -tip 1/4] sched: Avoid cputime scaling overflow
 [PATCH -tip 2/4] sched: Do not account bogus utime
 [PATCH -tip 3/4] sched: Avoid prev->stime underflow
 [PATCH -tip 4/4] Revert "math64: New div64_u64_rem helper"

so it gets rid of the div64_u64_rem() bits as well.

Thanks,

	Ingo
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