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From: Ankur Arora <ankur.a.arora@oracle.com>
To: "Christoph Lameter (Ampere)" <cl@gentwo.org>
Cc: Ankur Arora <ankur.a.arora@oracle.com>,
	linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org, bpf@vger.kernel.org,
	arnd@arndb.de, catalin.marinas@arm.com, will@kernel.org,
	peterz@infradead.org, akpm@linux-foundation.org,
	mark.rutland@arm.com, harisokn@amazon.com, ast@kernel.org,
	rafael@kernel.org, daniel.lezcano@linaro.org, memxor@gmail.com,
	zhenglifeng1@huawei.com, xueshuai@linux.alibaba.com,
	joao.m.martins@oracle.com, boris.ostrovsky@oracle.com,
	konrad.wilk@oracle.com
Subject: Re: [PATCH v7 2/7] arm64: barrier: Support smp_cond_load_relaxed_timeout()
Date: Tue, 21 Oct 2025 20:07:31 -0700	[thread overview]
Message-ID: <871pmvws5o.fsf@oracle.com> (raw)
In-Reply-To: <c8be3663-42db-4c8e-cb5c-b7f28aaefc04@gentwo.org>


Christoph Lameter (Ampere) <cl@gentwo.org> writes:

> On Thu, 16 Oct 2025, Ankur Arora wrote:
>
>> +#define SMP_TIMEOUT_POLL_COUNT	1
>
> A way to disable the spinning in the core code and thus arm64 wont spin
> there anymore. Good.
>
> Spinning is bad and a waste of cpu resources. If this is done then I
> would like the arch code to implement the spinning and not the core so

Agreed.

> that there is a motivation for the arch maintainer to
> come up with a way to avoid the spinning at some point.
>
> The patch is ok as is.
>
> Reviewed-by: Christoph Lameter (Ampere) <cl@gentwo.org>

Thanks for all the reviews!

--
ankur

  reply	other threads:[~2025-10-22  3:08 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-10-17  6:15 [PATCH v7 0/7] barrier: Add smp_cond_load_*_timeout() Ankur Arora
2025-10-17  6:16 ` [PATCH v7 1/7] asm-generic: barrier: Add smp_cond_load_relaxed_timeout() Ankur Arora
2025-10-21 17:21   ` Christoph Lameter (Ampere)
2025-10-17  6:16 ` [PATCH v7 2/7] arm64: barrier: Support smp_cond_load_relaxed_timeout() Ankur Arora
2025-10-21 17:31   ` Christoph Lameter (Ampere)
2025-10-22  3:07     ` Ankur Arora [this message]
2025-10-17  6:16 ` [PATCH v7 3/7] arm64: rqspinlock: Remove private copy of smp_cond_load_acquire_timewait() Ankur Arora
2025-10-21 17:38   ` Christoph Lameter (Ampere)
2025-10-17  6:16 ` [PATCH v7 4/7] asm-generic: barrier: Add smp_cond_load_acquire_timeout() Ankur Arora
2025-10-17  6:16 ` [PATCH v7 5/7] atomic: Add atomic_cond_read_*_timeout() Ankur Arora
2025-10-21 17:39   ` Christoph Lameter (Ampere)
2025-10-17  6:16 ` [PATCH v7 6/7] rqspinlock: Use smp_cond_load_acquire_timeout() Ankur Arora
2025-10-17  6:16 ` [PATCH v7 7/7] cpuidle/poll_state: Poll via smp_cond_load_relaxed_timeout() Ankur Arora
2025-10-21 17:42   ` Christoph Lameter (Ampere)
2025-10-27 20:06   ` Ankur Arora
2025-10-27 20:13     ` Rafael J. Wysocki
2025-10-28  5:32       ` Ankur Arora

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