Messages in this thread |  | | From | Frederic Weisbecker <> | | Subject | [GIT PULL] isolation: 1Hz residual tick offloading v3 | | Date | Thu, 4 Jan 2018 05:25:32 +0100 |
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Ingo,
Please pull the sched/0hz branch that can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git sched/0hz
HEAD: 9e932b2cc707209febd130978a5eb9f4a943a3f4
-- Now that scheduler_tick() has become resilient towards the absence of ticks, current->sched_class->task_tick() is the last piece that needs at least 1Hz tick to keep scheduler stats alive.
This patchset adds a flag to the isolcpus boot option to offload the residual 1Hz tick. This way the nohz_full CPUs don't have anymore tick (assuming nothing else requires it) as their residual 1Hz tick is offloaded to the housekeepers.
For quick testing, say on CPUs 1-7:
"isolcpus=nohz_offload,domain,1-7"
Thanks, Frederic ---
Frederic Weisbecker (5): sched: Rename init_rq_hrtick to hrtick_rq_init sched/isolation: Add scheduler tick offloading interface nohz: Allow to check if remote CPU tick is stopped sched/isolation: Residual 1Hz scheduler tick offload sched/isolation: Document "nohz_offload" flag
Documentation/admin-guide/kernel-parameters.txt | 7 +- include/linux/sched/isolation.h | 3 +- include/linux/tick.h | 2 + kernel/sched/core.c | 94 +++++++++++++++++++++++-- kernel/sched/isolation.c | 10 +++ kernel/sched/sched.h | 2 + kernel/time/tick-sched.c | 7 ++ 7 files changed, 117 insertions(+), 8 deletions(-)
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