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

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Date:	Thu, 15 Jan 2009 11:21:05 -0800
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Greg KH <greg@...ah.com>, Dimitri Sivanich <sivanich@....com>
CC:	"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

> > 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.

-Tony
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