Hi Juri,
于 10/21/14, 9:29 PM, Juri Lelli 写道:
Hi,
On 21/10/14 13:19, Wanpeng Li wrote:
Cc Juri,
于 10/14/14, 10:22 AM, Wanpeng Li 写道:
Use nr_cpus_allowed to bail from select_task_rq() when only one cpu
can be used, and saves some cycles for pinned tasks.
Signed-off-by: Wanpeng Li <[email protected]>
---
kernel/sched/deadline.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c
index f46b7f1..5874bf8 100644
--- a/kernel/sched/deadline.c
+++ b/kernel/sched/deadline.c
@@ -914,6 +914,9 @@ select_task_rq_dl(struct task_struct *p, int cpu, int
sd_flag, int flags)
struct task_struct *curr;
struct rq *rq;
+ if (p->nr_cpus_allowed == 1)
+ goto out;
+
if (sd_flag != SD_BALANCE_WAKE)
goto out;
Apart from the encoding of the resend, it looks good, thanks!
What's your meaning of resend? Do you mean this one?
https://lkml.org/lkml/2014/10/10/425
I'm afraid they are different patches.
Regards,
Wanpeng Li
Best,
- Juri
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