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authorIngo Molnar <mingo@elte.hu>2007-10-15 17:00:14 +0200
committerIngo Molnar <mingo@elte.hu>2007-10-15 17:00:14 +0200
commitd274a4cee190c880ec25b60501efe50c4435b3d7 (patch)
tree583be6dd4e33681b3c792280ac94e1e484a2da66 /kernel/sched_fair.c
parentsched: prevent wakeup over-scheduling (diff)
downloadlinux-d274a4cee190c880ec25b60501efe50c4435b3d7.tar.xz
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/sched_fair.c')
-rw-r--r--kernel/sched_fair.c12
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;