From: Catalin Marinas <catalin.marinas@arm.com>
To: David Laight <david.laight.linux@gmail.com>
Cc: Ankur Arora <ankur.a.arora@oracle.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
linux-arm-kernel@lists.infradead.org, linux-pm@vger.kernel.org,
bpf@vger.kernel.org, arnd@arndb.de, will@kernel.org,
peterz@infradead.org, mark.rutland@arm.com, harisokn@amazon.com,
cl@gentwo.org, ast@kernel.org, rafael@kernel.org,
daniel.lezcano@linaro.org, memxor@gmail.com,
zhenglifeng1@huawei.com, xueshuai@linux.alibaba.com,
rdunlap@infradead.org, joao.m.martins@oracle.com,
boris.ostrovsky@oracle.com, konrad.wilk@oracle.com
Subject: Re: [PATCH v10 00/12] barrier: Add smp_cond_load_{relaxed,acquire}_timeout()
Date: Wed, 25 Mar 2026 13:53:50 +0000 [thread overview]
Message-ID: <acPo7l_pd5rnHpSX@arm.com> (raw)
In-Reply-To: <20260317091705.5a64fc56@pumpkin>
On Tue, Mar 17, 2026 at 09:17:05AM +0000, David Laight wrote:
> On Mon, 16 Mar 2026 23:53:22 -0700
> Ankur Arora <ankur.a.arora@oracle.com> wrote:
> > David Laight <david.laight.linux@gmail.com> writes:
> > > On arm64 I think you could use explicit sev and wfe - but that will wake all
> > > 'sleeping' cpu; and you may not want the 'thundering herd'.
> >
> > Wouldn't we still have the same narrow window where the CPU disregards the IPI?
>
> You need a 'sevl' in the interrupt exit path.
No need to, see the rule below in
https://developer.arm.com/documentation/ddi0487/maa/2983-beijhbbd:
R_XRZRK
The Event Register for a PE is set by any of the following:
[...]
- An exception return.
--
Catalin
next prev parent reply other threads:[~2026-03-25 13:53 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-16 1:36 [PATCH v10 00/12] barrier: Add smp_cond_load_{relaxed,acquire}_timeout() Ankur Arora
2026-03-16 1:36 ` [PATCH v10 01/12] asm-generic: barrier: Add smp_cond_load_relaxed_timeout() Ankur Arora
2026-03-16 1:36 ` [PATCH v10 02/12] arm64: barrier: Support smp_cond_load_relaxed_timeout() Ankur Arora
2026-03-16 1:36 ` [PATCH v10 03/12] arm64/delay: move some constants out to a separate header Ankur Arora
2026-03-16 1:36 ` [PATCH v10 04/12] arm64: support WFET in smp_cond_load_relaxed_timeout() Ankur Arora
2026-04-01 10:44 ` Catalin Marinas
2026-04-01 22:31 ` Ankur Arora
2026-03-16 1:36 ` [PATCH v10 05/12] arm64: rqspinlock: Remove private copy of smp_cond_load_acquire_timewait() Ankur Arora
2026-03-24 1:41 ` Kumar Kartikeya Dwivedi
2026-03-25 5:58 ` Ankur Arora
2026-03-16 1:36 ` [PATCH v10 06/12] asm-generic: barrier: Add smp_cond_load_acquire_timeout() Ankur Arora
2026-03-16 1:36 ` [PATCH v10 07/12] atomic: Add atomic_cond_read_*_timeout() Ankur Arora
2026-03-16 1:36 ` [PATCH v10 08/12] locking/atomic: scripts: build atomic_long_cond_read_*_timeout() Ankur Arora
2026-03-16 1:36 ` [PATCH v10 09/12] bpf/rqspinlock: switch check_timeout() to a clock interface Ankur Arora
2026-03-24 1:43 ` Kumar Kartikeya Dwivedi
2026-03-25 5:57 ` Ankur Arora
2026-03-16 1:36 ` [PATCH v10 10/12] bpf/rqspinlock: Use smp_cond_load_acquire_timeout() Ankur Arora
2026-03-24 1:46 ` Kumar Kartikeya Dwivedi
2026-03-16 1:36 ` [PATCH v10 11/12] sched: add need-resched timed wait interface Ankur Arora
2026-03-16 1:36 ` [PATCH v10 12/12] cpuidle/poll_state: Wait for need-resched via tif_need_resched_relaxed_wait() Ankur Arora
2026-03-16 1:49 ` [PATCH v10 00/12] barrier: Add smp_cond_load_{relaxed,acquire}_timeout() Andrew Morton
2026-03-16 22:08 ` Ankur Arora
2026-03-16 23:37 ` David Laight
2026-03-17 6:53 ` Ankur Arora
2026-03-17 9:17 ` David Laight
2026-03-25 13:53 ` Catalin Marinas [this message]
2026-03-25 15:42 ` David Laight
2026-03-25 16:32 ` Catalin Marinas
2026-03-25 20:23 ` David Laight
2026-03-26 15:39 ` Catalin Marinas
2026-03-25 15:55 ` Catalin Marinas
2026-03-25 19:36 ` David Laight
2026-04-02 7:01 ` Ankur Arora
2026-04-03 16:12 ` [PATCH v10 00/12] barrier: Add smp_cond_load_{relaxed, acquire}_timeout() Okanovic, Haris
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