From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
To: Peter Zijlstra <peterz@infradead.org>
Cc: "Paul E. McKenney" <paulmck@kernel.org>,
Ankur Arora <ankur.a.arora@oracle.com>,
linux-kernel@vger.kernel.org, tglx@linutronix.de,
mingo@kernel.org, juri.lelli@redhat.com,
vincent.guittot@linaro.org, dietmar.eggemann@arm.com,
rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de,
vschneid@redhat.com, frederic@kernel.org, efault@gmx.de
Subject: Re: [PATCH 2/7] rcu: limit PREEMPT_RCU configurations
Date: Thu, 10 Oct 2024 12:26:57 +0200 [thread overview]
Message-ID: <20241010102657.H7HpIbVp@linutronix.de> (raw)
In-Reply-To: <20241010100308.GE17263@noisy.programming.kicks-ass.net>
On 2024-10-10 12:03:08 [+0200], Peter Zijlstra wrote:
> >
> > I can't deselect CONFIG_PREEMPT_RCU=y. This is because LAZY selects
> > PREEMPT_BUILD and PREEMPT_RCU selects itself once PREEMPTION is on.
>
> Oh, the entry isn't user selectable? Fix that perhaps?
>
> - bool
> + bool "Use preemptible RCU"
>
> Or something along those lines -- I forever forget how Kconfig works.
Oh. Well, yes. If we do this then it becomes suddenly selectable and
half of the series makes sense…
But as you said, this complicates things.
Sebastian
next prev parent reply other threads:[~2024-10-10 10:27 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-09 16:54 [PATCH 0/7] Lazy preemption bits Ankur Arora
2024-10-09 16:54 ` [PATCH 1/7] sched: warn for high latency with TIF_NEED_RESCHED_LAZY Ankur Arora
2024-10-10 6:37 ` Sebastian Andrzej Siewior
2024-10-10 18:19 ` Ankur Arora
2024-10-13 9:44 ` kernel test robot
2024-10-13 9:54 ` kernel test robot
2024-10-16 9:36 ` Shrikanth Hegde
2024-10-21 19:21 ` Ankur Arora
2024-10-22 5:41 ` Shrikanth Hegde
2024-10-09 16:54 ` [PATCH 2/7] rcu: limit PREEMPT_RCU configurations Ankur Arora
2024-10-09 18:01 ` Peter Zijlstra
2024-10-09 18:24 ` Paul E. McKenney
2024-10-09 20:52 ` Peter Zijlstra
2024-10-09 21:16 ` Paul E. McKenney
2024-10-10 7:58 ` Peter Zijlstra
2024-10-10 14:19 ` Paul E. McKenney
2024-10-10 6:32 ` Sebastian Andrzej Siewior
2024-10-10 8:10 ` Peter Zijlstra
2024-10-10 9:13 ` Sebastian Andrzej Siewior
2024-10-10 10:03 ` Peter Zijlstra
2024-10-10 10:26 ` Sebastian Andrzej Siewior [this message]
2024-10-10 10:44 ` Peter Zijlstra
2024-10-10 14:29 ` Paul E. McKenney
2024-10-11 8:18 ` Sebastian Andrzej Siewior
2024-10-11 13:59 ` Paul E. McKenney
2024-10-11 14:43 ` Sebastian Andrzej Siewior
2024-10-11 15:59 ` Paul E. McKenney
2024-10-15 11:22 ` Sebastian Andrzej Siewior
2024-10-15 22:13 ` Ankur Arora
2024-10-17 8:04 ` Sebastian Andrzej Siewior
2024-10-17 22:50 ` Ankur Arora
2024-10-18 17:43 ` Paul E. McKenney
2024-10-18 19:18 ` Ankur Arora
2024-10-18 23:24 ` Paul E. McKenney
2024-10-19 1:07 ` Ankur Arora
2024-10-19 4:30 ` Paul E. McKenney
2024-10-15 23:11 ` Paul E. McKenney
2024-10-17 7:07 ` Sebastian Andrzej Siewior
2024-10-18 17:38 ` Paul E. McKenney
2024-10-21 11:27 ` Sebastian Andrzej Siewior
2024-10-21 16:48 ` Paul E. McKenney
2024-10-21 19:20 ` Ankur Arora
2024-10-22 23:49 ` Paul E. McKenney
2024-10-22 14:09 ` Sebastian Andrzej Siewior
2024-10-22 23:54 ` Paul E. McKenney
2024-10-23 6:58 ` Sebastian Andrzej Siewior
2024-10-10 17:35 ` Ankur Arora
2024-10-11 7:58 ` Sebastian Andrzej Siewior
2024-10-15 23:01 ` Ankur Arora
2024-10-10 17:42 ` Ankur Arora
2024-10-09 16:54 ` [PATCH 3/7] rcu: fix header guard for rcu_all_qs() Ankur Arora
2024-10-10 6:41 ` Sebastian Andrzej Siewior
2024-10-10 8:11 ` Peter Zijlstra
2024-10-10 14:29 ` Paul E. McKenney
2024-10-09 16:54 ` [PATCH 4/7] rcu: handle quiescent states for PREEMPT_RCU=n, PREEMPT_COUNT=y Ankur Arora
2024-10-09 19:05 ` Ankur Arora
2024-10-10 14:37 ` Paul E. McKenney
2024-10-10 17:59 ` Ankur Arora
2024-10-10 6:50 ` Sebastian Andrzej Siewior
2024-10-10 17:56 ` Ankur Arora
2024-10-11 7:52 ` Sebastian Andrzej Siewior
2024-10-09 16:54 ` [PATCH 5/7] rcu: rename PREEMPT_AUTO to PREEMPT_LAZY Ankur Arora
2024-10-09 18:02 ` Peter Zijlstra
2024-10-09 18:52 ` Ankur Arora
2024-10-09 16:54 ` [PATCH 6/7] osnoise: handle quiescent states for PREEMPT_RCU=n, PREEMPTION=y Ankur Arora
2024-10-10 6:53 ` Sebastian Andrzej Siewior
2024-10-10 14:39 ` Paul E. McKenney
2024-10-10 17:50 ` Ankur Arora
2024-10-11 7:36 ` Sebastian Andrzej Siewior
2024-10-14 20:14 ` Ankur Arora
2024-10-09 16:54 ` [PATCH 7/7] powerpc: add support for PREEMPT_LAZY Ankur Arora
2024-10-10 7:22 ` Sebastian Andrzej Siewior
2024-10-10 18:10 ` Ankur Arora
2024-10-11 18:35 ` Shrikanth Hegde
2024-10-12 22:42 ` Michael Ellerman
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