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authorIngo Molnar <mingo@elte.hu>2006-01-14 13:20:41 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-14 18:25:20 -0800
commitb0a9499c3dd50d333e2aedb7e894873c58da3785 (patch)
tree1b9610020884091984ce8290c70bebdc3e7bb09b /include/linux
parent2d0cfb527944c2cfee2cffab14f52d483e329fcf (diff)
[PATCH] sched: add new SCHED_BATCH policy
Add a new SCHED_BATCH (3) scheduling policy: such tasks are presumed CPU-intensive, and will acquire a constant +5 priority level penalty. Such policy is nice for workloads that are non-interactive, but which do not want to give up their nice levels. The policy is also useful for workloads that want a deterministic scheduling policy without interactivity causing extra preemptions (between that workload's tasks). Signed-off-by: Ingo Molnar <mingo@elte.hu> Cc: Michael Kerrisk <mtk-manpages@gmx.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux')
-rw-r--r--include/linux/sched.h7
1 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index a72e1713542..2df1a1a2fee 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -160,6 +160,7 @@ extern unsigned long nr_iowait(void);
#define SCHED_NORMAL 0
#define SCHED_FIFO 1
#define SCHED_RR 2
+#define SCHED_BATCH 3
struct sched_param {
int sched_priority;
@@ -470,9 +471,9 @@ struct signal_struct {
/*
* Priority of a process goes from 0..MAX_PRIO-1, valid RT
- * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL tasks are
- * in the range MAX_RT_PRIO..MAX_PRIO-1. Priority values
- * are inverted: lower p->prio value means higher priority.
+ * priority is 0..MAX_RT_PRIO-1, and SCHED_NORMAL/SCHED_BATCH
+ * tasks are in the range MAX_RT_PRIO..MAX_PRIO-1. Priority
+ * values are inverted: lower p->prio value means higher priority.
*
* The MAX_USER_RT_PRIO value allows the actual maximum
* RT priority to be separate from the value exported to