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authorPeter Williams <pwil3058@bigpond.net.au>2006-07-10 04:43:51 -0700
committerLinus Torvalds <torvalds@g5.osdl.org>2006-07-10 13:24:13 -0700
commit0a565f7919cfb3d3df2c97d45751cbb83d858f97 (patch)
treecc1294f43b1e14dbc5a69a9624b69a48eec78bd1
parente45b3b6af09dab2a28a7c88b340d0bcdd173e068 (diff)
[PATCH] sched: fix bug in __migrate_task()
Problem: In the function __migrate_task(), deactivate_task() followed by activate_task() is used to move the task from one run queue to another. This has two undesirable effects: 1. The task's priority is recalculated. (Nowhere else in the scheduler code is the priority recalculated for a change of CPU.) 2. The task's time stamp is set to the current time. At the very least, this makes the adjustment of the time stamp before the call to deactivate_task() redundant but I believe the problem is more serious as the time stamp now holds the time of the queue change instead of the time at which the task was woken. In addition, unless dest_rq is the same queue as "current" is on the time stamp could be inaccurate due to inter CPU drift. Solution: Replace the call to activate_task() with one to __activate_task(). Signed-off-by: Peter Williams <pwil3058@bigpond.net.au> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
-rw-r--r--kernel/sched.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 4ee400f9d56..b47819b676f 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -4877,7 +4877,7 @@ static int __migrate_task(struct task_struct *p, int src_cpu, int dest_cpu)
p->timestamp = p->timestamp - rq_src->timestamp_last_tick
+ rq_dest->timestamp_last_tick;
deactivate_task(p, rq_src);
- activate_task(p, rq_dest, 0);
+ __activate_task(p, rq_dest);
if (TASK_PREEMPTS_CURR(p, rq_dest))
resched_task(rq_dest->curr);
}