Ingo,
Please pull the timers/nohz-hz1 branch that can be found at:
git://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
timers/nohz-hz1
HEAD: a7f4d69bb1d5e1f573b680355a2ad51566338887
It fixes a Kconfig dependency issue and forces a minimum of 1 tick every seconds
to keep handling the scheduler_tick() duties, even at a very low granularity.
This
is a workaround until we can handle all these duties through on-demand driven
solutions rather than using periodic events, as per your suggestion.
I just noted two things:
* update_cpu_load_active() seem to rely on the fixed periodic tick at the
HZ rate. There is certainly something to tweak there to make it really correct
with dynamick ticks. I have the feeling that modifying pending_updates won't
work
as it seems to decay assuming the time to catch up was idle.
* I'll probably have to disable CONFIG_CFS_BANDWIDTH when full dynticks
is enabled. First of all it modifies rq->nr_running without using
inc/dec_nr_running
standard API, which is required for full dynticks. And second, I need to
triple
check it's safe to use with 1 tick per second.
Ah and please note the merge commit (c032862fba51a3ca504752d3a25186b324c5ce83)
that was needed to get latest RCU and sched updates for the Kconfig fix.
Thanks,
Frederic
---
Frederic Weisbecker (2):
rcu: Fix full dynticks' dependency on wide RCU nocb mode
sched: Keep at least 1 tick per second for active dynticks tasks
include/linux/sched.h | 1 +
init/Kconfig | 4 ++--
kernel/sched/core.c | 30 ++++++++++++++++++++++++++++++
kernel/sched/idle_task.c | 1 +
kernel/sched/sched.h | 10 ++++++++++
kernel/time/Kconfig | 1 -
kernel/time/tick-sched.c | 7 +++++++
7 files changed, 51 insertions(+), 3 deletions(-)
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