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

From: Ingo Molnar
Date: Tue Apr 30 2013 - 12:30:42 EST

* Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> wrote:

> On Tue, Apr 30, 2013 at 9:23 AM, Ingo Molnar <mingo@xxxxxxxxxx> 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.


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