Messages in this thread Patch in this message | | | From | Aubrey Li <> | Subject | [RFC PATCH v2 6/8] cpuidle: make fast idle threshold tunable | Date | Sat, 30 Sep 2017 15:20:32 +0800 |
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Add a knob to make fast idle threshold tunable
Signed-off-by: Aubrey Li <aubrey.li@linux.intel.com> --- drivers/cpuidle/cpuidle.c | 3 ++- include/linux/cpuidle.h | 1 + kernel/sysctl.c | 12 ++++++++++++ 3 files changed, 15 insertions(+), 1 deletion(-)
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c index 6cb7e17..5d4f0b6 100644 --- a/drivers/cpuidle/cpuidle.c +++ b/drivers/cpuidle/cpuidle.c @@ -35,6 +35,7 @@ LIST_HEAD(cpuidle_detected_devices); static int enabled_devices; static int off __read_mostly; static int initialized __read_mostly; +int sysctl_fast_idle_ratio = 10; int cpuidle_disabled(void) { @@ -346,7 +347,7 @@ void cpuidle_predict(void) if (!dev) return; - overhead_threshold = dev->idle_stat.overhead; + overhead_threshold = dev->idle_stat.overhead * sysctl_fast_idle_ratio; if (cpuidle_curr_governor->predict) { dev->idle_stat.predicted_us = cpuidle_curr_governor->predict(); diff --git a/include/linux/cpuidle.h b/include/linux/cpuidle.h index 791db15..45b8264 100644 --- a/include/linux/cpuidle.h +++ b/include/linux/cpuidle.h @@ -24,6 +24,7 @@ struct module; struct cpuidle_device; struct cpuidle_driver; +extern int sysctl_fast_idle_ratio; /**************************** * CPUIDLE DEVICE INTERFACE * diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 6648fbb..97f7e8af 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -67,6 +67,7 @@ #include <linux/kexec.h> #include <linux/bpf.h> #include <linux/mount.h> +#include <linux/cpuidle.h> #include <linux/uaccess.h> #include <asm/processor.h> @@ -1229,6 +1230,17 @@ static struct ctl_table kern_table[] = { .extra2 = &one, }, #endif +#ifdef CONFIG_CPU_IDLE + { + .procname = "fast_idle_ratio", + .data = &sysctl_fast_idle_ratio, + .maxlen = sizeof(int), + .mode = 0644, + .proc_handler = proc_dointvec_minmax, + .extra1 = &one, + .extra2 = &one_hundred, + }, +#endif { } }; -- 2.7.4
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