linux-kernel - [PATCH v2 0/2] workqueue: Fix rescuer task's name truncated

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Message-ID: <20240513140115.3892827-1-haowenchao2@huawei.com>
Date: Mon, 13 May 2024 22:01:13 +0800
From: Wenchao Hao <haowenchao2@...wei.com>
To: Tejun Heo <tj@...nel.org>, Lai Jiangshan <jiangshanlai@...il.com>, Aaron
 Tomlin <atomlin@...mlin.com>, <linux-kernel@...r.kernel.org>
CC: Wenchao Hao <haowenchao22@...il.com>, Wenchao Hao <haowenchao2@...wei.com>
Subject: [PATCH v2 0/2] workqueue: Fix rescuer task's name truncated

Task comm of task is limitted to 16, prefix "kworker/R-" is added for
rescuer worker's task, which cause most task name is truncated as
following:

root   81  0.0  0.0  0  0 ?   I<   11:18   0:00 [kworker/R-xprti]
root   82  0.0  0.0  0  0 ?   I<   11:18   0:00 [kworker/R-cfg80]
root   85  0.0  0.0  0  0 ?   I<   11:18   0:00 [kworker/R-nfsio]
root   86  0.0  0.0  0  0 ?   I<   11:18   0:00 [kworker/R-xfsal]
root   87  0.0  0.0  0  0 ?   I<   11:18   0:00 [kworker/R-xfs_m]
root   88  0.0  0.0  0  0 ?   I<   11:18   0:00 [kworker/R-acpi_]
root   93  0.0  0.0  0  0 ?   I<   11:18   0:00 [kworker/R-iscsi]
root   95  0.0  0.0  0  0 ?   I<   11:18   0:00 [kworker/R-scsi_]
root   97  0.0  0.0  0  0 ?   I<   11:18   0:00 [kworker/R-scsi_]
root   99  0.0  0.0  0  0 ?   I<   11:18   0:00 [kworker/R-scsi_]

I want to fix this issue by split rescuer name to 2 part like other
kworker, the normal part is "kworker/R" which is set to task_struct's comm,
another part is wq->name which is added to kworker's desc. These 2 parts
would be merged in wq_worker_comm().

The first patch fix the rescuer task's name truncated;
The second patch fix workqueue_struct's name truncated.

V2:
Add another patch to increased worker desc's length to 32 to fix compile
warning reported:
https://lore.kernel.org/oe-kbuild-all/202405131400.sEYZHYk2-lkp@intel.com/

Wenchao Hao (2):
  workqueue: Fix rescuer task's name truncated
  workqueue: Increase worker desc's length to 32

 include/linux/workqueue.h | 2 +-
 kernel/workqueue.c        | 6 +++++-
 2 files changed, 6 insertions(+), 2 deletions(-)

-- 
2.32.0