linux-kernel - Re: [PATCH] configure HAVE_UNSTABLE_SCHED_CLOCK for SGI

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Message-ID: <20090122190452.GA20770@kroah.com>
Date:	Thu, 22 Jan 2009 11:04:52 -0800
From:	Greg KH <greg@...ah.com>
To:	"Luck, Tony" <tony.luck@...el.com>
Cc:	Dimitri Sivanich <sivanich@....com>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Gregory Haskins <ghaskins@...ell.com>,
	Nick Piggin <npiggin@...e.de>, Tony Luck <tony.luck@...il.com>,
	Robin Holt <holt@....com>
Subject: Re: [PATCH] configure HAVE_UNSTABLE_SCHED_CLOCK for SGI_SN systems

On Thu, Jan 15, 2009 at 11:21:05AM -0800, Luck, Tony wrote:
> > > Greg, if everyone is OK with this patch, this should also be applied
> > > to all stable trees starting with 2.6.26.
> 
> > What is the status of this going into Linus's tree?
> 
> I'm about to ask Linus to pull a modified version that does
> a "select HAVE_UNSTABLE_SCHED_CLOCK" for all IA64 systems ...
> SGI sched_clock() is a lot less "stable" than most, but all
> ia64 systems can hit this as the ar.itc cycle counter is only
> s/w synchronized between cpus.

Thanks, I see it now and will queue it up for the next -stable releases.

greg k-h
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