linux-kernel - Re: [announce] CFS-devel, performance improvements

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Date:	Thu, 13 Sep 2007 11:19:34 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Roman Zippel <zippel@...ux-m68k.org>
Cc:	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mike Galbraith <efault@....de>
Subject: Re: [announce] CFS-devel, performance improvements



* Roman Zippel <zippel@...ux-m68k.org> wrote:

> > The sched-devel.git tree can be pulled from:
> >
> >    git://git.kernel.org/pub/scm/linux/kernel/git/mingo/linux-2.6-sched-devel.git
> 
> Am I the only one who can't clone that thing? [...]

Ah - i have messed up my sched-devel.git script so the git-push went to 
kernel.org but into my home directory :-/ Should work now - let me know 
if it doesnt.

i've also uploaded the patch series in quilt format, to:

  http://people.redhat.com/mingo/cfs-scheduler/devel/patches.tar.gz

> [...] It can't be entirely explained with the Kernel Summit, as this 
> is not the first time patches appear out of the blue in form of a git 
> tree.

i'm not sure what you mean, but i can definitely tell you that there was 
no scheduler hacking at the Kernel Summit. (there's no good wireless in 
the pubs and not enough space for a laptop anyway ;)

The impressive linecount has been mostly achieved by dumb removal:

    sched: remove wait_runtime fields and features
    4 files changed, 14 insertions(+), 161 deletions(-)

    sched: remove wait_runtime limit
    5 files changed, 3 insertions(+), 124 deletions(-)

    sched: remove precise CPU load calculations #2
    1 file changed, 1 insertion(+), 31 deletions(-)

    sched: remove precise CPU load
    3 files changed, 9 insertions(+), 41 deletions(-)

    sched: remove stat_gran
    4 files changed, 15 insertions(+), 50 deletions(-)

Hack time to do them: ~10 minutes apiece. Removing stuff is _easy_ :-)

The rest is finegrained, small changes. One of the harder patches was 
this one:

    commit 28c4b8ed35f0fc7050f186147da9e10b55e1e446
    sched: introduce se->vruntime
    3 files changed, 50 insertions(+), 33 deletions(-)

And i sent you the first variant of that already:

    http://lkml.org/lkml/2007/9/2/76

we needed 2 days after the KS to put it into shape and send it out for 
feedback.

	Ingo
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