Commit 567f3e42 authored Jul 17, 2007 by Andrew Morton Committed by Linus Torvalds Jul 17, 2007

x86_64: speedup touch_nmi_watchdog



Avoid dirtying remote cpu's memory if it already has the correct value.

Cc: Andi Kleen <ak@suse.de>
Cc: Konrad Rzeszutek <konrad@darnok.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent f2890255

arch/x86_64/kernel/nmi.c

+5 −3

Original line number	Diff line number	Diff line
		@@ -306,9 +306,11 @@ void touch_nmi_watchdog (void)
		* do it ourselves because the alert count increase is not
		* atomic.
		*/
		for_each_present_cpu (cpu)
		for_each_present_cpu(cpu) {
		if (per_cpu(nmi_touch, cpu) != 1)
		per_cpu(nmi_touch, cpu) = 1;
		}
		}

		touch_softlockup_watchdog();
		}