linux-kernel - Re: Backport hr-tick fix into .25/.26

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Message-ID: <20080819092543.GD28713@elte.hu>
Date:	Tue, 19 Aug 2008 11:25:43 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Justin Madru <jdm64@...ab.com>,
	lkml <linux-kernel@...r.kernel.org>,
	Michal Januszewski <spock@...too.org>,
	Antonino Daplas <adaplas@...il.com>, Greg KH <gregkh@...e.de>,
	Rafael Wysocki <rjw@...k.pl>,
	Romano Giannetti <romano.giannetti@...il.com>,
	Adrian Bunk <bunk@...nel.org>,
	Jeremy Nickurak <kernel-bugs@...us.rifetech.com>
Subject: Re: Backport hr-tick fix into .25/.26


* Peter Zijlstra <peterz@...radead.org> wrote:

> On Tue, 2008-08-19 at 02:31 +0200, Ingo Molnar wrote:
> > * Justin Madru <jdm64@...ab.com> wrote:
> > 
> > > This commit introduced the bug.
> > > commit 8f4d37ec073c17e2d4aa8851df5837d798606d6f
> > > sched: high-res preemption tick
> > 
> > > And this one fixed it
> > >
> > > commit 31656519e132f6612584815f128c83976a9aaaef
> > > sched, x86: clean up hrtick implementation
> > 
> > hm, the backport of 31656519 is a bit intrusive.
> > 
> > find below is an (untested!) version of it - i havent even build-tested 
> > it. Does it work for you? But this is Greg's call really.
> > 
> 
> It largely depends on all the new IPI stuff that went into 27 as well, 
> so I'd be surprised if its easily backportable..

ah, i see. How about a simple patch then that disables hrtick [given 
that it's now fixed .27 but the fix is too intrusive to backport]? Would 
that be too risky for -stable?

	Ingo
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