From: Andrew Morton <akpm@linux-foundation.org>
To: Ankur Arora <ankur.a.arora@oracle.com>
Cc: 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, catalin.marinas@arm.com,
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, david.laight.linux@gmail.com,
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: Sun, 15 Mar 2026 18:49:25 -0700 [thread overview]
Message-ID: <20260315184925.b6f93386e918ca79614843e3@linux-foundation.org> (raw)
In-Reply-To: <20260316013651.3225328-1-ankur.a.arora@oracle.com>
On Sun, 15 Mar 2026 18:36:39 -0700 Ankur Arora <ankur.a.arora@oracle.com> wrote:
> Hi,
>
> This series adds waited variants of the smp_cond_load() primitives:
> smp_cond_load_relaxed_timeout(), and smp_cond_load_acquire_timeout().
>
> ...
>
How are we to determine that this change is successful, useful, etc?
Reduced CPU consumption? Reduced energy usage? Improved latencies?
>
> Finally update poll_idle() and resilient queued spinlocks to use them.
Have you identified other suitable sites for conversion?
>
> Documentation/atomic_t.txt | 14 +++--
> arch/arm64/Kconfig | 3 +
> arch/arm64/include/asm/barrier.h | 23 +++++++
> arch/arm64/include/asm/cmpxchg.h | 62 +++++++++++++++----
> arch/arm64/include/asm/delay-const.h | 27 +++++++++
> arch/arm64/include/asm/rqspinlock.h | 85 --------------------------
> arch/arm64/lib/delay.c | 15 ++---
> drivers/cpuidle/poll_state.c | 21 +------
> drivers/soc/qcom/rpmh-rsc.c | 8 +--
> include/asm-generic/barrier.h | 90 ++++++++++++++++++++++++++++
> include/linux/atomic.h | 10 ++++
> include/linux/atomic/atomic-long.h | 18 +++---
> include/linux/sched/idle.h | 29 +++++++++
> kernel/bpf/rqspinlock.c | 77 +++++++++++++++---------
> scripts/atomic/gen-atomic-long.sh | 16 +++--
> 15 files changed, 320 insertions(+), 178 deletions(-)
> create mode 100644 arch/arm64/include/asm/delay-const.h
Some sort of testing in lib/tests/ would be appropriate and useful.
next prev parent reply other threads:[~2026-03-16 1:49 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-16 1:36 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 ` Andrew Morton [this message]
2026-03-16 22:08 ` [PATCH v10 00/12] barrier: Add smp_cond_load_{relaxed,acquire}_timeout() 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
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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