Repository files (latest commit first)

Filename	Latest commit message	Latest commit date
Quentin Perret 449884aeb3 sched: Fix UCLAMP_FLAG_IDLE setting ... [ Upstream commit ca4984a7dd863f3e1c0df775ae3e744bff24c303 ] The UCLAMP_FLAG_IDLE flag is set on a runqueue when dequeueing the last uclamp active task (that is, when buckets.tasks reaches 0 for all buckets) to maintain the last uclamp.max and prevent blocked util from suddenly becoming visible. However, there is an asymmetry in how the flag is set and cleared which can lead to having the flag set whilst there are active tasks on the rq. Specifically, the flag is cleared in the uclamp_rq_inc() path, which is called at enqueue time, but set in uclamp_rq_dec_id() which is called both when dequeueing a task _and_ in the update_uclamp_active() path. As a result, when both uclamp_rq_{dec,ind}_id() are called from update_uclamp_active(), the flag ends up being set but not cleared, hence leaving the runqueue in a broken state. Fix this by clearing the flag in update_uclamp_active() as well. Fixes: e496187da7 ("sched/uclamp: Enforce last task's UCLAMP_MAX") Reported-by: Rick Yiu <rickyiu@google.com> Signed-off-by: Quentin Perret <qperret@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Reviewed-by: Qais Yousef <qais.yousef@arm.com> Tested-by: Dietmar Eggemann <dietmar.eggemann@arm.com> Link: https://lore.kernel.org/r/20210805102154.590709-2-qperret@google.com Signed-off-by: Sasha Levin <sashal@kernel.org>		2021-09-15 09:47:28 +02:00
..
autogroup.c
autogroup.h
clock.c
completion.c
core.c	sched: Fix UCLAMP_FLAG_IDLE setting	2021-09-15 09:47:28 +02:00
cpuacct.c
cpudeadline.c
cpudeadline.h
cpufreq.c
cpufreq_schedutil.c	sched/uclamp: Protect uclamp fast path code with static key	2020-09-03 11:26:49 +02:00
cpupri.c
cpupri.h
cputime.c
deadline.c	sched/deadline: Fix missing clock update in migrate_task_rq_dl()	2021-09-15 09:47:26 +02:00
debug.c	sched/debug: Fix cgroup_path[] serialization	2021-05-14 09:44:26 +02:00
fair.c	kthread: Fix PF_KTHREAD vs to_kthread() race	2021-09-12 08:56:39 +02:00
features.h
idle.c	rcu/nocb: Perform deferred wake up before last idle's need_resched() check	2021-03-04 10:26:47 +01:00
isolation.c
loadavg.c
Makefile
membarrier.c	sched/membarrier: fix missing local execution of ipi_sync_rq_state()	2021-03-17 17:03:57 +01:00
pelt.c
pelt.h
psi.c
rt.c	sched/rt: Fix RT utilization tracking during policy change	2021-07-14 16:53:24 +02:00
sched-pelt.h
sched.h	sched/deadline: Fix reset_on_fork reporting of DL tasks	2021-09-15 09:47:26 +02:00
stats.c
stats.h
stop_task.c
swait.c
topology.c	sched: correct SD_flags returned by tl->sd_flags()	2020-08-19 08:15:54 +02:00
wait.c	rq-qos: fix missed wake-ups in rq_qos_throttle try two	2021-07-19 08:53:16 +02:00
wait_bit.c