powerpc: Use smt_snooze_delay=-1 to always busy loop
Right now if we want to busy loop and not give up any time to the hypervisor
we put a very large value into smt_snooze_delay. This is sometimes useful
when running a single partition and you want to avoid any latencies due
to the hypervisor or CPU power state transitions. While this works, it's a bit
ugly - how big a number is enough now we have NO_HZ and can be idle for a very
long time.
The patch below makes smt_snooze_delay signed, and a negative value means loop
forever:
echo -1 > /sys/devices/system/cpu/cpu0/smt_snooze_delay
This change shouldn't affect the existing userspace tools (eg ppc64_cpu), but
I'm cc-ing Nathan just to be sure.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/kernel/sysfs.c b/arch/powerpc/kernel/sysfs.c
index 158fb73..c0d8c20 100644
--- a/arch/powerpc/kernel/sysfs.c
+++ b/arch/powerpc/kernel/sysfs.c
@@ -35,7 +35,7 @@
#ifdef CONFIG_PPC64
/* Time in microseconds we delay before sleeping in the idle loop */
-DEFINE_PER_CPU(unsigned long, smt_snooze_delay) = { 100 };
+DEFINE_PER_CPU(long, smt_snooze_delay) = { 100 };
static ssize_t store_smt_snooze_delay(struct sys_device *dev,
struct sysdev_attribute *attr,
@@ -44,9 +44,9 @@
{
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
ssize_t ret;
- unsigned long snooze;
+ long snooze;
- ret = sscanf(buf, "%lu", &snooze);
+ ret = sscanf(buf, "%ld", &snooze);
if (ret != 1)
return -EINVAL;
@@ -61,7 +61,7 @@
{
struct cpu *cpu = container_of(dev, struct cpu, sysdev);
- return sprintf(buf, "%lu\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
+ return sprintf(buf, "%ld\n", per_cpu(smt_snooze_delay, cpu->sysdev.id));
}
static SYSDEV_ATTR(smt_snooze_delay, 0644, show_smt_snooze_delay,
@@ -70,15 +70,14 @@
static int __init setup_smt_snooze_delay(char *str)
{
unsigned int cpu;
- int snooze;
+ long snooze;
if (!cpu_has_feature(CPU_FTR_SMT))
return 1;
- if (get_option(&str, &snooze)) {
- for_each_possible_cpu(cpu)
- per_cpu(smt_snooze_delay, cpu) = snooze;
- }
+ snooze = simple_strtol(str, NULL, 10);
+ for_each_possible_cpu(cpu)
+ per_cpu(smt_snooze_delay, cpu) = snooze;
return 1;
}