Paul Turner c006fac556 sched: Warn on long periods of pending need_resched ... CPU scheduler marks need_resched flag to signal a schedule() on a particular CPU. But, schedule() may not happen immediately in cases where the current task is executing in the kernel mode (no preemption state) for extended periods of time. This patch adds a warn_on if need_resched is pending for more than the time specified in sysctl resched_latency_warn_ms. If it goes off, it is likely that there is a missing cond_resched() somewhere. Monitoring is done via the tick and the accuracy is hence limited to jiffy scale. This also means that we won't trigger the warning if the tick is disabled. This feature (LATENCY_WARN) is default disabled. Signed-off-by: Paul Turner <pjt@google.com> Signed-off-by: Josh Don <joshdon@google.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20210416212936.390566-1-joshdon@google.com		2021-04-21 13:55:41 +02:00
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autogroup.h
clock.h
coredump.h
cpufreq.h	cpufreq: Add special-purpose fast-switching callback for drivers	2020-12-15 19:24:18 +01:00
cputime.h
deadline.h
debug.h	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
hotplug.h	sched/hotplug: Consolidate task migration on CPU unplug	2020-11-10 18:38:58 +01:00
idle.h
init.h
isolation.h
jobctl.h	signal: kill JOBCTL_TASK_WORK	2020-12-12 09:17:38 -07:00
loadavg.h
mm.h	include/linux/sched/mm.h: use rcu_dereference in in_vfork()	2021-03-13 11:27:30 -08:00
nohz.h
numa_balancing.h
prio.h	sched: Remove USER_PRIO, TASK_USER_PRIO and MAX_USER_PRIO	2021-02-17 14:08:17 +01:00
rt.h
sd_flags.h
signal.h	tif-task_work.arch-2020-12-14	2020-12-16 12:33:35 -08:00
smt.h
stat.h
sysctl.h	sched: Warn on long periods of pending need_resched	2021-04-21 13:55:41 +02:00
task_stack.h
task.h	kernel: provide create_io_thread() helper	2021-03-04 15:45:03 -07:00
topology.h	sched/topology,schedutil: Wrap sched domains rebuild	2020-11-19 11:25:47 +01:00
types.h
user.h
wake_q.h
xacct.h