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| author | Andrew Morton <akpm@linux-foundation.org> | 2007-07-17 04:03:57 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2007-07-17 10:23:04 -0700 |
| commit | f2890255b0ade497893d1e5e99f519b5c1d50f7d (patch) | |
| tree | 54657c4bbe91325960ac2da676a5d212a8866544 | |
| parent | 1c978b935e81da9434342f0bc8263c6cfe1214ce (diff) | |
| download | linux-f2890255b0ade497893d1e5e99f519b5c1d50f7d.tar.bz2 | |
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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | arch/i386/kernel/nmi.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/i386/kernel/nmi.c b/arch/i386/kernel/nmi.c index fba121f7973f..03b7f5584d71 100644 --- a/arch/i386/kernel/nmi.c +++ b/arch/i386/kernel/nmi.c @@ -295,7 +295,7 @@ static unsigned int last_irq_sums [NR_CPUS], alert_counter [NR_CPUS]; -void touch_nmi_watchdog (void) +void touch_nmi_watchdog(void) { if (nmi_watchdog > 0) { unsigned cpu; @@ -304,8 +304,10 @@ void touch_nmi_watchdog (void) * Just reset the alert counters, (other CPUs might be * spinning on locks we hold): */ - for_each_present_cpu (cpu) - alert_counter[cpu] = 0; + for_each_present_cpu(cpu) { + if (alert_counter[cpu]) + alert_counter[cpu] = 0; + } } /* |