From: Joel Fernandes <joel@joelfernandes.org>
To: linux-kernel@vger.kernel.org
Cc: Josh Triplett <josh@joshtriplett.org>,
kernel-team@android.com, Lai Jiangshan <jiangshanlai@gmail.com>,
linux-kselftest@vger.kernel.org,
Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
"Paul E. McKenney" <paulmck@linux.ibm.com>,
rcu@vger.kernel.org,
Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
Shuah Khan <shuah@kernel.org>,
Steven Rostedt <rostedt@goodmis.org>
Subject: Re: [RFC 1/3] rcu: Expedite the rcu quiescent state reporting if help needed
Date: Mon, 1 Jul 2019 09:53:46 -0400 [thread overview]
Message-ID: <20190701135346.GA167294@google.com> (raw)
In-Reply-To: <20190701040415.219001-1-joel@joelfernandes.org>
On Mon, Jul 01, 2019 at 12:04:13AM -0400, Joel Fernandes (Google) wrote:
> The t->rcu_read_unlock_special union's need_qs bit can be set by the
> scheduler tick (in rcu_flavor_sched_clock_irq) to indicate that help is
> needed from the rcu_read_unlock path. When this help arrives however, we
> can do better to speed up the quiescent state reporting which if
> rcu_read_unlock_special::need_qs is set might be quite urgent. Make use
> of this information in deciding when to do heavy-weight softirq raising
> where possible.
Just fyi, TREE01-06, SRCU-N and SRCU-t passed overnight testing with this series.
next prev parent reply other threads:[~2019-07-01 13:53 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-01 4:04 [RFC 1/3] rcu: Expedite the rcu quiescent state reporting if help needed Joel Fernandes (Google)
2019-07-01 4:04 ` [RFC 2/3] rcu: Simplify rcu_note_context_switch exit from critical section Joel Fernandes (Google)
2019-07-01 20:03 ` Paul E. McKenney
2019-07-01 21:33 ` Joel Fernandes
2019-07-01 21:42 ` Paul E. McKenney
2019-07-01 4:04 ` [RFC 3/3] Revert "rcutorture: Tweak kvm options" Joel Fernandes (Google)
2019-07-01 12:23 ` Sebastian Andrzej Siewior
2019-07-01 14:14 ` Joel Fernandes
2019-07-01 14:48 ` Dmitry Vyukov
2019-07-01 14:59 ` Joel Fernandes
2019-07-01 20:27 ` Paul E. McKenney
2019-07-01 21:31 ` Joel Fernandes
2019-07-01 21:50 ` Paul E. McKenney
2019-07-02 2:56 ` Joel Fernandes
2019-07-02 3:34 ` Paul E. McKenney
2020-07-31 9:22 ` [tip: core/rcu] torture: Remove qemu dependency on EFI firmware tip-bot2 for Paul E. McKenney
2019-07-01 13:53 ` Joel Fernandes [this message]
2019-07-02 3:47 ` [RFC 1/3] rcu: Expedite the rcu quiescent state reporting if help needed Paul E. McKenney
2019-07-02 11:40 ` Joel Fernandes
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