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Commit d274a4ce authored by Ingo Molnar's avatar Ingo Molnar
Browse files

sched: update comment 



update comment: clarify time-slices and remove obsolete tuning detail.

Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 95938a35

kernel/sched_fair.c

+5 −7
Original line number Diff line number Diff line
@@ -25,14 +25,12 @@ 
 * (default: 20ms, units: nanoseconds)

 *

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

 * 'timeslice length' - timeslices in CFS are of variable length.

 * (to see the precise effective timeslice length of your workload,

 *  run vmstat and monitor the context-switches field)

 * 'timeslice length' - timeslices in CFS are of variable length

 * and have no persistent notion like in traditional, time-slice

 * based scheduling concepts.

 *

 * On SMP systems the value of this is multiplied by the log2 of the

 * 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.)

 * Targeted preemption latency for CPU-bound tasks:

 * (to see the precise effective timeslice length of your workload,

 *  run vmstat and monitor the context-switches (cs) field)

 */

const_debug unsigned int sysctl_sched_latency = 20000000ULL;