Luca Abeni 5aa5050787 sched/deadline: Fix migration of SCHED_DEADLINE tasks ... Commit: 9d51426242 ("sched/deadline: Reduce rq lock contention by eliminating locking of non-feasible target") broke select_task_rq_dl() and find_lock_later_rq(), because it introduced a comparison between the local task's deadline and dl.earliest_dl.curr of the remote queue. However, if the remote runqueue does not contain any SCHED_DEADLINE task its earliest_dl.curr is 0 (always smaller than the deadline of the local task) and the remote runqueue is not selected for pushing. As a result, if an application creates multiple SCHED_DEADLINE threads, they will never be pushed to runqueues that do not already contain SCHED_DEADLINE tasks. This patch fixes the issue by checking if dl.dl_nr_running == 0. Signed-off-by: Luca Abeni <luca.abeni@unitn.it> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Juri Lelli <juri.lelli@arm.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Mike Galbraith <efault@gmx.de> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Wanpeng Li <wanpeng.li@linux.intel.com> Fixes: 9d51426242 ("sched/deadline: Reduce rq lock contention by eliminating locking of non-feasible target") Link: http://lkml.kernel.org/r/1444982781-15608-1-git-send-email-luca.abeni@unitn.it Signed-off-by: Ingo Molnar <mingo@kernel.org>		2015-10-20 10:13:36 +02:00
..
auto_group.c
auto_group.h
clock.c
completion.c
core.c	nohz: Revert "nohz: Set isolcpus when nohz_full is set"	2015-10-20 10:13:36 +02:00
cpuacct.c
cpuacct.h
cpudeadline.c
cpudeadline.h
cpupri.c
cpupri.h
cputime.c	sched/cputime: Guarantee stime + utime == rtime	2015-08-03 12:21:21 +02:00
deadline.c	sched/deadline: Fix migration of SCHED_DEADLINE tasks	2015-10-20 10:13:36 +02:00
debug.c	sched/fair: Provide runnable_load_avg back to cfs_rq	2015-08-03 12:24:31 +02:00
fair.c	sched/fair: Update task group's load_avg after task migration	2015-10-20 10:13:35 +02:00
features.h	sched/numa: Prefer NUMA hotness over cache hotness	2015-07-07 08:46:10 +02:00
idle_task.c	sched: Make sched_class::set_cpus_allowed() unconditional	2015-08-12 12:06:09 +02:00
idle.c	sched, tracing: Stop/start critical timings around the idle=poll idle loop	2015-10-12 09:45:25 +02:00
loadavg.c
Makefile
rt.c	sched: Change the sched_class::set_cpus_allowed() calling context	2015-08-12 12:06:10 +02:00
sched.h	sched/core: Fix TASK_DEAD race in finish_task_switch()	2015-10-06 17:05:17 +02:00
stats.c
stats.h
stop_task.c	sched: Make sched_class::set_cpus_allowed() unconditional	2015-08-12 12:06:09 +02:00
wait.c	userfaultfd: revert "userfaultfd: waitqueue: add nr wake parameter to __wake_up_locked_key"	2015-09-22 15:09:53 -07:00