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| author | Valentin Schneider <valentin.schneider@arm.com> | 2021-01-13 19:31:41 +0100 |
|---|---|---|
| committer | Peter Zijlstra <peterz@infradead.org> | 2021-01-22 15:09:41 +0100 |
| commit | 36c6e17bf16922935a5a0dd073d5b032d34aa73d (patch) | |
| tree | 4f20b106f92b74f80d3b033512ef58ffad252ffe /kernel/pid_namespace.c | |
| parent | x86: PM: Register syscore_ops for scale invariance (diff) | |
| download | linux-36c6e17bf16922935a5a0dd073d5b032d34aa73d.tar.xz linux-36c6e17bf16922935a5a0dd073d5b032d34aa73d.zip | |
sched/core: Print out straggler tasks in sched_cpu_dying()
Since commit
1cf12e08bc4d ("sched/hotplug: Consolidate task migration on CPU unplug")
tasks are expected to move themselves out of a out-going CPU. For most
tasks this will be done automagically via BALANCE_PUSH, but percpu kthreads
will have to cooperate and move themselves away one way or another.
Currently, some percpu kthreads (workqueues being a notable exemple) do not
cooperate nicely and can end up on an out-going CPU at the time
sched_cpu_dying() is invoked.
Print the dying rq's tasks to shed some light on the stragglers.
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Valentin Schneider <valentin.schneider@arm.com>
Tested-by: Valentin Schneider <valentin.schneider@arm.com>
Link: https://lkml.kernel.org/r/20210113183141.11974-1-valentin.schneider@arm.com
Diffstat (limited to 'kernel/pid_namespace.c')
0 files changed, 0 insertions, 0 deletions