[IA64] reduce cacheline bouncing in cpu_idle_wait

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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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Zwane Mwaikambo 2005-03-30 21:40:00 -07:00 • committed by Tony Luck

parent de7548d0e2

commit 7d5f9c0f10

1 changed files with 26 additions and 15 deletions

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arch/ia64/kernel/process.c

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