Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=567f3e422a9a155d7c7643148efb5bf959065d34
Commit: 567f3e422a9a155d7c7643148efb5bf959065d34
Parent: f2890255b0ade497893d1e5e99f519b5c1d50f7d
Author: Andrew Morton <[EMAIL PROTECTED]>
AuthorDate: Tue Jul 17 04:03:58 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Tue Jul 17 10:23:04 2007 -0700
x86_64: speedup touch_nmi_watchdog
Avoid dirtying remote cpu's memory if it already has the correct value.
Cc: Andi Kleen <[EMAIL PROTECTED]>
Cc: Konrad Rzeszutek <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
arch/x86_64/kernel/nmi.c | 8 +++++---
1 files changed, 5 insertions(+), 3 deletions(-)
diff --git a/arch/x86_64/kernel/nmi.c b/arch/x86_64/kernel/nmi.c
index 931c64b..edbbc59 100644
--- a/arch/x86_64/kernel/nmi.c
+++ b/arch/x86_64/kernel/nmi.c
@@ -296,7 +296,7 @@ static DEFINE_PER_CPU(unsigned, last_irq_sum);
static DEFINE_PER_CPU(local_t, alert_counter);
static DEFINE_PER_CPU(int, nmi_touch);
-void touch_nmi_watchdog (void)
+void touch_nmi_watchdog(void)
{
if (nmi_watchdog > 0) {
unsigned cpu;
@@ -306,8 +306,10 @@ void touch_nmi_watchdog (void)
* do it ourselves because the alert count increase is not
* atomic.
*/
- for_each_present_cpu (cpu)
- per_cpu(nmi_touch, cpu) = 1;
+ for_each_present_cpu(cpu) {
+ if (per_cpu(nmi_touch, cpu) != 1)
+ per_cpu(nmi_touch, cpu) = 1;
+ }
}
touch_softlockup_watchdog();
-
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