linux-kernel - Re: [PATCH v5] erofs: lazily initialize per-CPU workers and CPU hotplug hooks

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Message-ID: <96b206b2-4808-4cbb-960c-016b07dec3bf@kernel.org>
Date: Tue, 6 May 2025 10:53:37 +0800
From: Chao Yu <chao@...nel.org>
To: Sandeep Dhavale <dhavale@...gle.com>, linux-erofs@...ts.ozlabs.org,
 Gao Xiang <xiang@...nel.org>, Yue Hu <zbestahu@...il.com>,
 Jeffle Xu <jefflexu@...ux.alibaba.com>
Cc: chao@...nel.org, hsiangkao@...ux.alibaba.com, kernel-team@...roid.com,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5] erofs: lazily initialize per-CPU workers and CPU
 hotplug hooks

On 2025/5/2 2:30, Sandeep Dhavale wrote:
> Currently, when EROFS is built with per-CPU workers, the workers are
> started and CPU hotplug hooks are registered during module initialization.
> This leads to unnecessary worker start/stop cycles during CPU hotplug
> events, particularly on Android devices that frequently suspend and resume.
> 
> This change defers the initialization of per-CPU workers and the
> registration of CPU hotplug hooks until the first EROFS mount. This
> ensures that these resources are only allocated and managed when EROFS is
> actually in use.
> 
> The tear down of per-CPU workers and unregistration of CPU hotplug hooks
> still occurs during z_erofs_exit_subsystem(), but only if they were
> initialized.
> 
> Signed-off-by: Sandeep Dhavale <dhavale@...gle.com>

Reviewed-by: Chao Yu <chao@...nel.org>

Thanks,