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| author | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:14 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:14 +0200 |
| commit | d274a4cee190c880ec25b60501efe50c4435b3d7 (patch) | |
| tree | 583be6dd4e33681b3c792280ac94e1e484a2da66 /kernel | |
| parent | 95938a35c5562afa7af7252821e44132391a3db8 (diff) | |
| download | linux-d274a4cee190c880ec25b60501efe50c4435b3d7.tar.gz linux-d274a4cee190c880ec25b60501efe50c4435b3d7.tar.bz2 linux-d274a4cee190c880ec25b60501efe50c4435b3d7.zip | |
sched: update comment
update comment: clarify time-slices and remove obsolete tuning detail.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched_fair.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index f819f943fb86..ec1592eb8d08 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -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; |