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sched: Move p->nr_cpus_allowed check to select_task_rq()

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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 <[email protected]>
Signed-off-by: Wanpeng Li <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Cc: "pang.xunlei" <[email protected]>
Cc: Linus Torvalds <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Wanpeng Li 2014-11-05 09:14:37 +08:00 • committed by Ingo Molnar
commit 6c1d9410f0
4 changed files with 2 additions and 10 deletions
Download patch file Download diff file Expand all files Collapse all files

3
kernel/sched/core.c
View file

@ -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

3
kernel/sched/deadline.c
View file

@ -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;

3
kernel/sched/fair.c
View file

@ -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));

3
kernel/sched/rt.c
View file

@ -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;