linux-kernel - [PATCH v1 0/1] erofs: start per-CPU workers on demand

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Message-ID: <20250331022011.645533-1-dhavale@google.com>
Date: Sun, 30 Mar 2025 19:20:07 -0700
From: Sandeep Dhavale <dhavale@...gle.com>
To: linux-erofs@...ts.ozlabs.org, Gao Xiang <xiang@...nel.org>, 
	Chao Yu <chao@...nel.org>, Yue Hu <zbestahu@...il.com>, 
	Jeffle Xu <jefflexu@...ux.alibaba.com>, Sandeep Dhavale <dhavale@...gle.com>
Cc: hsiangkao@...ux.alibaba.com, kernel-team@...roid.com, 
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 0/1] erofs: start per-CPU workers on demand

erofs currently starts per-CPU workers on module_init() which is not
necessary. This starting of resources on cpu hotplug and unplug
shows up in Android where the erofs in built-in and erofs is
not yet being used.

Following patch moves the creation of per-CPU workers on the first
mount and they are removed when on the last unmount.

I tested this with erofs-utils test as well as running reads on
erofs mountpoint while running aggressive cpu online/offline in a
loop, withoutn any issue.

Thanks,
Sandeep.

Sandeep Dhavale (1):
  erofs: lazily initialize per-CPU workers and CPU hotplug support

 fs/erofs/internal.h |  5 +++++
 fs/erofs/super.c    | 27 +++++++++++++++++++++++++++
 fs/erofs/zdata.c    | 35 +++++++++++++++++++++++------------
 3 files changed, 55 insertions(+), 12 deletions(-)

-- 
2.49.0.472.ge94155a9ec-goog