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Commit 60334caf37dc7c59120b21faa625534a6fffead0

Authored by Kirill Tkhai
Committed by Ingo Molnar
1 parent fc79e240be
Exists in smarc-l5.0.0_1.0.0-ga and in 5 other branches imx_3.10.17_1.0.1_ga, imx_3.10.53_1.1.0_ga, imx_3.14.28_1.0.0_ga, smarc-imx_3.10.53_1.1.0_ga, smarc-imx_3.14.28_1.0.0_ga

sched/rt: Further simplify pick_rt_task() 

Function next_prio() has been removed and pull_rt_task() is the
only user of pick_next_highest_task_rt() at the moment.

pull_rt_task is not interested in p->nr_cpus_allowed, its only
interest is the fact that cpu is allowed to execute p. If
nr_cpus_allowed == 1, cpu != task_cpu(p) and cpu is allowed then
it means that task p is in the middle of the migration
techniques; the task waits until it is moved by migration
thread. So, lets pull it earlier.

Signed-off-by: Kirill V Tkhai <tkhai@yandex.ru>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Cc: Peter Zijlstra <peterz@infradead.org>
CC: linux-rt-users <linux-rt-users@vger.kernel.org>
Link: http://lkml.kernel.org/r/70871359644177@web16d.yandex.ru
Signed-off-by: Ingo Molnar <mingo@kernel.org>

Showing 1 changed file with 1 additions and 2 deletions Side-by-side Diff

... ... @@ -1427,8 +1427,7 @@
1427 1427 static int pick_rt_task(struct rq *rq, struct task_struct *p, int cpu)
1428 1428 {
1429 1429 if (!task_running(rq, p) &&
1430   - (cpu < 0 || cpumask_test_cpu(cpu, tsk_cpus_allowed(p))) &&
1431   - (p->nr_cpus_allowed > 1))
  1430 + cpumask_test_cpu(cpu, tsk_cpus_allowed(p)))
1432 1431 return 1;
1433 1432 return 0;
1434 1433 }