From: Zwane Mwaikambo <zwane@arm.linux.org.uk>
Date: Thu, 31 Mar 2005 04:40:00 +0000 (-0700)
Subject: [IA64] reduce cacheline bouncing in cpu_idle_wait
X-Git-Tag: v2.6.12-rc4~117^2~5^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7d5f9c0f10255000ca007fb03773c6b825c2b9ce;p=pandora-kernel.git

[IA64] reduce cacheline bouncing in cpu_idle_wait

Andi noted that during normal runtime cpu_idle_map is bounced around a lot,
and occassionally at a higher frequency than the timer interrupt wakeup
which we normally exit pm_idle from.  So switch to a percpu variable.

I didn't move things to the slow path because it would involve adding
scheduler code to wakeup the idle thread on the cpus we're waiting for.

Signed-off-by: Zwane Mwaikambo <zwane@arm.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Tony Luck <tony.luck@intel.com>
---

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