AcoSail/kernel_optimize_test
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this_cpu: Use this_cpu_xx in nmi handling

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this_cpu_inc/dec reduces the number of instructions needed.

Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Christoph Lameter 2009-10-07 19:04:29 -04:00 committed by Tejun Heo
parent b7a4c946d0
commit 494f6a9e12
2 changed files with 8 additions and 8 deletions
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8
arch/sparc/kernel/nmi.c
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@ -47,7 +47,7 @@ static DEFINE_PER_CPU(short, wd_enabled);
static int endflag __initdata;
static DEFINE_PER_CPU(unsigned int, last_irq_sum);
static DEFINE_PER_CPU(local_t, alert_counter);
static DEFINE_PER_CPU(long, alert_counter);
static DEFINE_PER_CPU(int, nmi_touch);
void touch_nmi_watchdog(void)
@ -112,13 +112,13 @@ notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs)
touched = 1;
}
if (!touched && __get_cpu_var(last_irq_sum) == sum) {
local_inc(&__get_cpu_var(alert_counter));
if (local_read(&__get_cpu_var(alert_counter)) == 30 * nmi_hz)
__this_cpu_inc(per_cpu_var(alert_counter));
if (__this_cpu_read(per_cpu_var(alert_counter)) == 30 * nmi_hz)
die_nmi("BUG: NMI Watchdog detected LOCKUP",
regs, panic_on_timeout);
} else {
__get_cpu_var(last_irq_sum) = sum;
local_set(&__get_cpu_var(alert_counter), 0);
__this_cpu_write(per_cpu_var(alert_counter), 0);
}
if (__get_cpu_var(wd_enabled)) {
write_pic(picl_value(nmi_hz));

8
arch/x86/kernel/apic/nmi.c
View File

@ -360,7 +360,7 @@ void stop_apic_nmi_watchdog(void *unused)
*/
static DEFINE_PER_CPU(unsigned, last_irq_sum);
static DEFINE_PER_CPU(local_t, alert_counter);
static DEFINE_PER_CPU(long, alert_counter);
static DEFINE_PER_CPU(int, nmi_touch);
void touch_nmi_watchdog(void)
@ -437,8 +437,8 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
* Ayiee, looks like this CPU is stuck ...
* wait a few IRQs (5 seconds) before doing the oops ...
*/
local_inc(&__get_cpu_var(alert_counter));
if (local_read(&__get_cpu_var(alert_counter)) == 5 * nmi_hz)
__this_cpu_inc(per_cpu_var(alert_counter));
if (__this_cpu_read(per_cpu_var(alert_counter)) == 5 * nmi_hz)
/*
* die_nmi will return ONLY if NOTIFY_STOP happens..
*/
@ -446,7 +446,7 @@ nmi_watchdog_tick(struct pt_regs *regs, unsigned reason)
regs, panic_on_timeout);
} else {
__get_cpu_var(last_irq_sum) = sum;
local_set(&__get_cpu_var(alert_counter), 0);
__this_cpu_write(per_cpu_var(alert_counter), 0);
}
/* see if the nmi watchdog went off */