aboutsummaryrefslogtreecommitdiffstats
path: root/kernel/sched_fair.c
diff options
context:
space:
mode:
authorIngo Molnar <mingo@elte.hu>2007-10-15 11:00:14 -0400
committerIngo Molnar <mingo@elte.hu>2007-10-15 11:00:14 -0400
commitd274a4cee190c880ec25b60501efe50c4435b3d7 (patch)
tree583be6dd4e33681b3c792280ac94e1e484a2da66 /kernel/sched_fair.c
parent95938a35c5562afa7af7252821e44132391a3db8 (diff)
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 @@
25 * (default: 20ms, units: nanoseconds) 25 * (default: 20ms, units: nanoseconds)
26 * 26 *
27 * NOTE: this latency value is not the same as the concept of 27 * NOTE: this latency value is not the same as the concept of
28 * 'timeslice length' - timeslices in CFS are of variable length. 28 * 'timeslice length' - timeslices in CFS are of variable length
29 * (to see the precise effective timeslice length of your workload, 29 * and have no persistent notion like in traditional, time-slice
30 * run vmstat and monitor the context-switches field) 30 * based scheduling concepts.
31 * 31 *
32 * On SMP systems the value of this is multiplied by the log2 of the 32 * (to see the precise effective timeslice length of your workload,
33 * number of CPUs. (i.e. factor 2x on 2-way systems, 3x on 4-way 33 * run vmstat and monitor the context-switches (cs) field)
34 * systems, 4x on 8-way systems, 5x on 16-way systems, etc.)
35 * Targeted preemption latency for CPU-bound tasks:
36 */ 34 */
37const_debug unsigned int sysctl_sched_latency = 20000000ULL; 35const_debug unsigned int sysctl_sched_latency = 20000000ULL;
38 36