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From: Tejun Heo <tj@kernel.org>
To: Breno Leitao <leitao@debian.org>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>,
	Marco Crivellari <marco.crivellari@suse.com>,
	linux-kernel@vger.kernel.org, kernel-team@meta.com
Subject: Re: [PATCH wq/for-7.4 v2 3/3] workqueue: add a percpu_concurrency_managed workqueue attribute
Date: Mon, 28 Sep 2026 11:31:11 -1000	[thread overview]
Message-ID: <1bcd7a71f382de147d7e26ee14f00ac7@kernel.org> (raw)
In-Reply-To: <20260925-wq_final-v2-3-860ee052169e@debian.org>

Hello, Breno.

On Fri, Sep 25, 2026 at 06:09:52AM -0700, Breno Leitao wrote:
> Introduce percpu_concurrency_managed, similar to the discussion in [1],
> and use it when deciding to do concurrency management, instead of
> relying on WQ_PERCPU (the only WQ type that does CM as of now).

Once PERCPU is its own scope, the scope picks the backend, and concurrency
management and the per-cpu max_active follow from that. Opting out of
concurrency management on the per-cpu pools is what WQ_CPU_INTENSIVE already
does, and I don't see a need to change that at runtime. How about dropping
this patch for now?

Thanks.

--
tejun

  reply	other threads:[~2026-09-28 21:31 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-09-25 13:09 [PATCH wq/for-7.4 v2 0/3] workqueue: Keep max_active and percpu_max_active in sync Breno Leitao
2026-09-25 13:09 ` [PATCH wq/for-7.4 v2 1/3] workqueue: Move the initial max_active setup into a helper Breno Leitao
2026-09-25 13:09 ` [PATCH wq/for-7.4 v2 2/3] workqueue: Keep the limits of both max_active domains current Breno Leitao
2026-09-28 20:15   ` Tejun Heo
2026-09-29 14:40     ` Breno Leitao
2026-09-25 13:09 ` [PATCH wq/for-7.4 v2 3/3] workqueue: add a percpu_concurrency_managed workqueue attribute Breno Leitao
2026-09-28 21:31   ` Tejun Heo [this message]
2026-09-29 13:51     ` Breno Leitao

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