linux-kernel - Re: [PATCH v4] sched: automated per session task groups

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Message-ID: <20101129134744.GA30787@elte.hu>
Date:	Mon, 29 Nov 2010 14:47:44 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Galbraith <efault@....de>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, Paul Turner <pjt@...gle.com>
Subject: Re: [PATCH v4] sched: automated per session task groups


* Mike Galbraith <efault@....de> wrote:

> On Mon, 2010-11-29 at 13:30 +0100, Ingo Molnar wrote: 
> > * Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
> > 
> > > On Sun, 2010-11-28 at 21:18 +0100, Ingo Molnar wrote:
> > > > * Linus Torvalds <torvalds@...ux-foundation.org> wrote:
> > > > 
> > > > > On Sun, Nov 28, 2010 at 6:24 AM, Mike Galbraith <efault@....de> wrote:
> > > > > >
> > > > > > Something else is seriously wrong though.  36.1 with attached (plus
> > > > > > sched, cgroup: Fixup broken cgroup movement) works a treat, whereas
> > > > > > 37.git and tip with fixlet below both suck rocks.  With a make -j40
> > > > > > running, wakeup-latency is showing latencies of >100ms, amarok skips,
> > > > > > mouse lurches badly.. generally horrid.  Something went south.
> > > > > 
> > > > > Can you test -rc3? Is that still ok? And are you perhaps using
> > > > > Nouveau? There's a report of some graphics (?) regression since -rc3
> > > > > about bad desktop performance:
> > > > > 
> > > > >    https://bugzilla.kernel.org/show_bug.cgi?id=23912
> > > > > 
> > > > > but it doesn't have any more information yet (so if -rc3 _is_ good for
> > > > > you, and you can add anything to that report, it would be good. The
> > > > > original reporter is hopefully bisecting it now)
> > > > 
> > > > Mike, the last pure -rc3 -tip commit is 92c883adf03b - you could try to check that 
> > > > out too: it has most of the current sched/core commits, but has none of the post-rc3 
> > > > DRM changes.
> > > 
> > 
> > > Well we totally re-wrote the cgroup load-balancer in -tip. The thing currently in 
> > > -linus is a utter crap because its very strongly serialized across all cores (some 
> > > people spend like 25% of their time in there).
> > 
> > Yes, 92c883adf03b includes those changes:
> > 
> >  08f3c3065f4c: Merge branch 'sched/core'
> >  9437178f623a: sched: Update tg->shares after cpu.shares write
> >  d6b5591829bd: sched: Allow update_cfs_load() to update global load
> >  3b3d190ec368: sched: Implement demand based update_cfs_load()
> >  c66eaf619c0c: sched: Update shares on idle_balance
> >  a7a4f8a752ec: sched: Add sysctl_sched_shares_window
> >  67e86250f8ea: sched: Introduce hierarchal order on shares update list
> >  e33078baa4d3: sched: Fix update_cfs_load() synchronization
> >  f0d7442a5924: sched: Fix load corruption from update_cfs_shares()
> >  9e3081ca6114: sched: Make tg_shares_up() walk on-demand
> >  3d4b47b4b040: sched: Implement on-demand (active) cfs_rq list
> >  2069dd75c7d0: sched: Rewrite tg_shares_up)
> >  48c5ccae88dc: sched: Simplify cpu-hot-unplug task migration
> >  92fd4d4d67b9: Merge commit 'v2.6.37-rc2' into sched/core
> > 
> > I just wanted to give Mike a known-stable sha1 that has -rc3 but not the post-rc3 
> > DRM changes.
> 
> The good news is that the 37.git kernel was mislabeled in grub, was also
> booting the _tip_ kernel, and is actually just fine.  It's only tip, and
> tip 92fd4d4d67b9 is still bad.  I'll try a quick bisect before getting
> back to backlog.

Just curious, what's the freshest still good -tip sha1?

Thanks,

	Ingo
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