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| author | Mike Galbraith <efault@gmx.de> | 2007-10-15 17:00:07 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:07 +0200 |
| commit | 119fe5e06800afc197781ebc8c2d8ca7d03497c8 (patch) | |
| tree | 9e2c57360f6d7442b6e6e1e2c15542805f322231 | |
| parent | sched: better min_vruntime tracking (diff) | |
| download | linux-119fe5e06800afc197781ebc8c2d8ca7d03497c8.tar.xz linux-119fe5e06800afc197781ebc8c2d8ca7d03497c8.zip | |
sched: fix SMP migration latencies
fix SMP migration latencies: the vruntimes of different CPUs are
at incompatible offsets so they have to be fixed up when migrating
a task across CPUs.
Signed-off-by: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
| -rw-r--r-- | kernel/sched.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 0f0cf374c775..4ad789d268fe 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -992,6 +992,9 @@ void set_task_cpu(struct task_struct *p, unsigned int new_cpu) if (p->se.block_start) p->se.block_start -= clock_offset; #endif + if (likely(new_rq->cfs.min_vruntime)) + p->se.vruntime -= old_rq->cfs.min_vruntime - + new_rq->cfs.min_vruntime; __set_task_cpu(p, new_cpu); } |