From: Nicholas Piggin <npiggin@gmail.com>
To: Thomas Gleixner <tglx@linutronix.de>,
Frederic Weisbecker <fweisbec@gmail.com>
Cc: Nicholas Piggin <npiggin@gmail.com>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
"Rafael J . Wysocki" <rafael.j.wysocki@intel.com>,
linux-kernel@vger.kernel.org
Subject: [PATCH 0/4] Allow CPU0 to be nohz full
Date: Thu, 4 Apr 2019 22:07:00 +1000 [thread overview]
Message-ID: <20190404120704.18479-1-npiggin@gmail.com> (raw)
I've been looking at ways to fix suspend breakage with CPU0 as a
nohz CPU. I started looking at various things like allowing CPU0
to take over do_timer again temporarily or allowing nohz full
to be stopped at runtime (that is quite a significant change for
little real benefit). The problem then was having the housekeeping
CPU go offline.
So I decided to try just allowing the freeze to occur on non-zero
CPU. This seems to be a lot simpler to get working, but I guess
some archs won't be able to deal with this? Would it be okay to
make it opt-in per arch?
Thanks,
Nick
Nicholas Piggin (4):
sched/core: allow the remote scheduler tick to be started on CPU0
kernel/cpu: Allow non-zero CPU to be primary for suspend / kexec
freeze
kernel/sched/isolation: require a present CPU in housekeeping mask
nohz_full: Allow the boot CPU to be full nohz
include/linux/cpu.h | 2 +-
kernel/cpu.c | 10 +++++++-
kernel/sched/core.c | 2 +-
kernel/sched/isolation.c | 18 ++++++++++----
kernel/time/tick-common.c | 50 +++++++++++++++++++++++++++++++++++----
kernel/time/tick-sched.c | 27 +++++++++++----------
6 files changed, 84 insertions(+), 25 deletions(-)
--
2.20.1
next reply other threads:[~2019-04-04 12:07 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-04-04 12:07 Nicholas Piggin [this message]
2019-04-04 12:07 ` [PATCH 1/4] sched/core: allow the remote scheduler tick to be started on CPU0 Nicholas Piggin
2019-04-04 12:07 ` [PATCH 2/4] kernel/cpu: Allow non-zero CPU to be primary for suspend / kexec freeze Nicholas Piggin
2019-04-04 12:07 ` [PATCH 3/4] kernel/sched/isolation: require a present CPU in housekeeping mask Nicholas Piggin
2019-04-04 12:07 ` [PATCH 4/4] nohz_full: Allow the boot CPU to be full nohz Nicholas Piggin
2019-04-04 14:36 ` [PATCH 0/4] Allow CPU0 to be nohz full Thomas Gleixner
2019-04-04 16:02 ` Nicholas Piggin
2019-04-05 17:54 ` Thomas Gleixner
2019-04-09 9:21 ` Nicholas Piggin
2019-04-11 15:42 ` Paul E. McKenney
2019-04-12 3:16 ` Nicholas Piggin
2019-04-12 11:30 ` Paul E. McKenney
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