Commit-ID: 6c1d9410f007a26d13173cf17204cfd965f49b83 Gitweb: http://git.kernel.org/tip/6c1d9410f007a26d13173cf17204cfd965f49b83 Author: Wanpeng Li <wanpeng.li@xxxxxxxxxxxxxxx> AuthorDate: Wed, 5 Nov 2014 09:14:37 +0800 Committer: Ingo Molnar <mingo@xxxxxxxxxx> CommitDate: Sun, 16 Nov 2014 10:58:55 +0100 sched: Move p->nr_cpus_allowed check to select_task_rq() Move the p->nr_cpus_allowed check into kernel/sched/core.c: select_task_rq(). This change will make fair.c, rt.c, and deadline.c all start with the same logic. Suggested-and-Acked-by: Steven Rostedt <rostedt@xxxxxxxxxxx> Signed-off-by: Wanpeng Li <wanpeng.li@xxxxxxxxxxxxxxx> Signed-off-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx> Cc: "pang.xunlei" <pang.xunlei@xxxxxxxxxx> Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Link: http://lkml.kernel.org/r/1415150077-59053-1-git-send-email-wanpeng.li@xxxxxxxxxxxxxxx Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx> --- kernel/sched/core.c | 3 ++- kernel/sched/deadline.c | 3 --- kernel/sched/fair.c | 3 --- kernel/sched/rt.c | 3 --- 4 files changed, 2 insertions(+), 10 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 3ccdce1..d44d0c5 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1411,7 +1411,8 @@ out: static inline int select_task_rq(struct task_struct *p, int cpu, int sd_flags, int wake_flags) { - cpu = p->sched_class->select_task_rq(p, cpu, sd_flags, wake_flags); + if (p->nr_cpus_allowed > 1) + cpu = p->sched_class->select_task_rq(p, cpu, sd_flags, wake_flags); /* * In order not to call set_task_cpu() on a blocking task we need diff --git a/kernel/sched/deadline.c b/kernel/sched/deadline.c index b091179..bb1464b 100644 --- a/kernel/sched/deadline.c +++ b/kernel/sched/deadline.c @@ -928,9 +928,6 @@ 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; diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index d11c57d..8bca292 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4730,9 +4730,6 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f int want_affine = 0; int sync = wake_flags & WF_SYNC; - if (p->nr_cpus_allowed == 1) - return prev_cpu; - if (sd_flag & SD_BALANCE_WAKE) want_affine = cpumask_test_cpu(cpu, tsk_cpus_allowed(p)); diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index f1bb92f..ee15f5a 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -1301,9 +1301,6 @@ select_task_rq_rt(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; - /* For anything but wake ups, just return the task_cpu */ if (sd_flag != SD_BALANCE_WAKE && sd_flag != SD_BALANCE_FORK) goto out; -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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