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Commit f2890255 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
Browse files

i386: 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 1c978b93

arch/i386/kernel/nmi.c

+5 −3
Original line number Diff line number Diff line
@@ -304,9 +304,11 @@ void touch_nmi_watchdog (void) 
		 * Just reset the alert counters, (other CPUs might be

		 * spinning on locks we hold):

		 */

		for_each_present_cpu (cpu)

		for_each_present_cpu(cpu) {

			if (alert_counter[cpu])

				alert_counter[cpu] = 0;

		}

	}



	/*

	 * Tickle the softlockup detector too: