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Commit 71fd3714 authored by Ingo Molnar's avatar Ingo Molnar
Browse files

sched: remove HZ dependency from the granularity default 



remove HZ dependency from the granularity default. Use 10 msec for
the base granularity, 1 msec for wakeup granularity and 25 msec for
batch wakeup granularity. (These defaults are close to the values
that the default HZ=250 setting got previously, and thus it's the
most common setting.)

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 7c6c16f3

kernel/sched.c

+1 −1
Original line number Diff line number Diff line
@@ -4923,7 +4923,7 @@ static inline void sched_init_granularity(void) 
	if (sysctl_sched_granularity > gran_limit)

		sysctl_sched_granularity = gran_limit;



	sysctl_sched_runtime_limit = sysctl_sched_granularity * 8;

	sysctl_sched_runtime_limit = sysctl_sched_granularity * 5;

	sysctl_sched_wakeup_granularity = sysctl_sched_granularity / 2;

}

kernel/sched_fair.c

+6 −7
Original line number Diff line number Diff line
@@ -19,7 +19,7 @@ 


/*

 * Preemption granularity:

 * (default: 2 msec, units: nanoseconds)

 * (default: 10 msec, units: nanoseconds)

 *

 * NOTE: this granularity value is not the same as the concept of

 * 'timeslice length' - timeslices in CFS will typically be somewhat
@@ -31,18 +31,17 @@ 
 * number of CPUs. (i.e. factor 2x on 2-way systems, 3x on 4-way

 * systems, 4x on 8-way systems, 5x on 16-way systems, etc.)

 */

unsigned int sysctl_sched_granularity __read_mostly = 2000000000ULL/HZ;

unsigned int sysctl_sched_granularity __read_mostly = 10000000UL;



/*

 * SCHED_BATCH wake-up granularity.

 * (default: 10 msec, units: nanoseconds)

 * (default: 25 msec, units: nanoseconds)

 *

 * This option delays the preemption effects of decoupled workloads

 * and reduces their over-scheduling. Synchronous workloads will still

 * have immediate wakeup/sleep latencies.

 */

unsigned int sysctl_sched_batch_wakeup_granularity __read_mostly =

							10000000000ULL/HZ;

unsigned int sysctl_sched_batch_wakeup_granularity __read_mostly = 25000000UL;



/*

 * SCHED_OTHER wake-up granularity.
@@ -52,12 +51,12 @@ unsigned int sysctl_sched_batch_wakeup_granularity __read_mostly = 
 * and reduces their over-scheduling. Synchronous workloads will still

 * have immediate wakeup/sleep latencies.

 */

unsigned int sysctl_sched_wakeup_granularity __read_mostly = 1000000000ULL/HZ;

unsigned int sysctl_sched_wakeup_granularity __read_mostly = 1000000UL;



unsigned int sysctl_sched_stat_granularity __read_mostly;



/*

 * Initialized in sched_init_granularity():

 * Initialized in sched_init_granularity() [to 5 times the base granularity]:

 */

unsigned int sysctl_sched_runtime_limit __read_mostly;