Messages in this thread | | | From | Frederic Weisbecker <> | Subject | [PATCH 00/10] tick/nohz updates | Date | Thu, 11 Mar 2021 13:36:58 +0100 |
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Various updates for the timer/nohz side.
* Two fixes (maybe 01/10 deserves a stable tag, I should check)
* A Kconfig help change
* A debug check while enqueuing timers when the tick is stopped in idle.
* The rest is noise reduction for full nohz ("tick/nohz: Kick only _queued_ task whose tick dependency is updated"). It relies on the fact that p->on_rq is never set to anything else than TASK_ON_RQ_QUEUED while the task is running on a CPU, the only relevant exception being the task dequeuing itself on schedule(). I haven't found issues in my modest reviews of deactivate_task() callers but I lost my headlamp while visiting fair's sched entity dequeuing and throttling (had to find my way back in the dark again).
So please double check the last patch.
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git timers/nohz
HEAD: e469edfa00f97e5ec5d31fe31d3aef0a5c9bd607
Thanks, Frederic ---
Frederic Weisbecker (5): tick/nohz: Add tick_nohz_full_this_cpu() tick/nohz: Remove superflous check for CONFIG_VIRT_CPU_ACCOUNTING_NATIVE timer: Report ignored local enqueue in nohz mode tick/nohz: Update nohz_full Kconfig help tick/nohz: Only wakeup a single target cpu when kicking a task
Marcelo Tosatti (2): tick/nohz: Change signal tick dependency to wakeup CPUs of member tasks tick/nohz: Kick only _queued_ task whose tick dependency is updated
Yunfeng Ye (2): tick/nohz: Conditionally restart tick on idle exit tick/nohz: Update idle_exittime on actual idle exit
Zhou Ti (x2019cwm) (1): tick/nohz: Prevent tick_nohz_get_sleep_length() from returning negative value
include/linux/sched.h | 2 + include/linux/tick.h | 19 ++++-- kernel/sched/core.c | 25 +++++++- kernel/time/Kconfig | 11 ++-- kernel/time/posix-cpu-timers.c | 4 +- kernel/time/tick-sched.c | 134 +++++++++++++++++++++++++++++------------ 6 files changed, 142 insertions(+), 53 deletions(-)
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