From: Tejun Heo <tj@kernel.org>
To: Yunfeng Ye <yeyunfeng@huawei.com>
Cc: jiangshanlai@gmail.com, linux-kernel@vger.kernel.org,
Shiyuan Hu <hushiyuan@huawei.com>,
Hewenliang <hewenliang4@huawei.com>
Subject: Re: [PATCH v2] workqueue: Kick a worker based on the actual activation of delayed works
Date: Wed, 25 Nov 2020 07:45:47 -0500 [thread overview]
Message-ID: <X75R+8CRIOyu1IzE@mtj.duckdns.org> (raw)
In-Reply-To: <3837a2ee-f3d5-2732-7d15-7e9616319f05@huawei.com>
On Thu, Nov 19, 2020 at 02:21:25PM +0800, Yunfeng Ye wrote:
> In realtime scenario, We do not want to have interference on the
> isolated cpu cores. but when invoking alloc_workqueue() for percpu wq
> on the housekeeping cpu, it kick a kworker on the isolated cpu.
>
> alloc_workqueue
> pwq_adjust_max_active
> wake_up_worker
>
> The comment in pwq_adjust_max_active() said:
> "Need to kick a worker after thawed or an unbound wq's
> max_active is bumped"
>
> So it is unnecessary to kick a kworker for percpu's wq when invoking
> alloc_workqueue(). this patch only kick a worker based on the actual
> activation of delayed works.
>
> Signed-off-by: Yunfeng Ye <yeyunfeng@huawei.com>
Applied to wq/for-5.10-fixes w/ minor comment updates.
Thanks.
--
tejun
prev parent reply other threads:[~2020-11-25 12:46 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-11-19 6:21 Yunfeng Ye
2020-11-20 1:45 ` Lai Jiangshan
2020-11-25 12:45 ` Tejun Heo [this message]
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