From: Ankur Arora <ankur.a.arora@oracle.com>
To: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Ankur Arora <ankur.a.arora@oracle.com>,
Peter Zijlstra <peterz@infradead.org>,
"Paul E. McKenney" <paulmck@kernel.org>,
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: Tue, 15 Oct 2024 16:01:13 -0700 [thread overview]
Message-ID: <874j5drmx2.fsf@oracle.com> (raw)
In-Reply-To: <20241011075843.WABHhY70@linutronix.de>
Sebastian Andrzej Siewior <bigeasy@linutronix.de> writes:
> On 2024-10-10 10:35:25 [-0700], Ankur Arora wrote:
>> That's odd. I have that exact configuration (PREEMPT_DYANMIC=n,
>> PREEMPT_LAZY=y, PREEMPT_RCU=n).
>>
>> Can you share your .config?
>
> Sent offlist.
Thanks. So, I tried the config and your config enables
PREEMPT_LAZY=y, PREEMPT_DYNAMIC=n.
That forces PREEMPT_RCU=n.
If in that config you change the preemption options to
PREEMPT_LAZY=y, PREEMPT_DYNAMIC=y, we get PREEMPT_RCU=y.
Is that also the behaviour you are seeing? Seems to be doing
the right thing.
Also, quite similar to how we handle the PREEMPT_NONE/_VOLUNTARY
case. And, lazy is meant to have similar preemption behaviour
as those models.
--
ankur
next prev parent reply other threads:[~2024-10-15 23:01 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
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 [this message]
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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