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Message-ID: <20240423182104.1812150-1-haowenchao2@huawei.com>
Date: Wed, 24 Apr 2024 02:21:04 +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: [RFC PATCH] 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().
Fixes: b6a46f7263bd ("workqueue: Rename rescuer kworker")
Signed-off-by: Wenchao Hao <haowenchao2@...wei.com>
---
kernel/workqueue.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/kernel/workqueue.c b/kernel/workqueue.c
index 0066c8f6c154..0ce9e8597a4d 100644
--- a/kernel/workqueue.c
+++ b/kernel/workqueue.c
@@ -5430,7 +5430,7 @@ static int init_rescuer(struct workqueue_struct *wq)
}
rescuer->rescue_wq = wq;
- rescuer->task = kthread_create(rescuer_thread, rescuer, "kworker/R-%s", wq->name);
+ rescuer->task = kthread_create(rescuer_thread, rescuer, "kworker/R");
if (IS_ERR(rescuer->task)) {
ret = PTR_ERR(rescuer->task);
pr_err("workqueue: Failed to create a rescuer kthread for wq \"%s\": %pe",
@@ -5439,6 +5439,8 @@ static int init_rescuer(struct workqueue_struct *wq)
return ret;
}
+ snprintf(rescuer->desc, sizeof(rescuer->desc), "%s", wq->name);
+
wq->rescuer = rescuer;
if (wq->flags & WQ_UNBOUND)
kthread_bind_mask(rescuer->task, wq_unbound_cpumask);
@@ -6289,6 +6291,8 @@ void wq_worker_comm(char *buf, size_t size, struct task_struct *task)
worker->desc);
}
raw_spin_unlock_irq(&pool->lock);
+ } else if (worker->desc[0] != '\0') {
+ scnprintf(buf + off, size - off, "-%s", worker->desc);
}
}
--
2.32.0
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