From c7c879eedc02a9190d635be16d29b6bf4ea1595a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Micha=C5=82=20Miros=C5=82aw?= <mirq-linux@rere.qmqm.pl>
Date: Thu, 21 Oct 2021 23:13:25 +0200
Subject: [PATCH] dm: make workqueue names device-specific
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Add device number to kdmflush workqueue name to help debugging CPU usage.
Resulting `ps axfu` snippet:
root 3791 0.0 0.0 0 0 ? I< paź19 0:00 \_ [kdmflush/253:7]
root 3792 0.0 0.0 0 0 ? I< paź19 0:00 \_ [kcryptd_io/253:7]
root 3793 0.0 0.0 0 0 ? I< paź19 0:00 \_ [kcryptd/253:7]
root 3794 0.0 0.0 0 0 ? S paź19 0:00 \_ [dmcrypt_write/253:7]
root 3814 0.0 0.0 0 0 ? I< paź19 0:00 \_ [kdmflush/253:8]
root 3815 0.0 0.0 0 0 ? I< paź19 0:00 \_ [kdmflush/253:9]
root 3816 0.0 0.0 0 0 ? I< paź19 0:00 \_ [kdmflush/253:10]
Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
---
drivers/md/dm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/md/dm.c b/drivers/md/dm.c
index b966634cafd44..3e8fdc8bf239d 100644
--- a/drivers/md/dm.c
+++ b/drivers/md/dm.c
@@ -1800,7 +1800,7 @@ static struct mapped_device *alloc_dev(int minor)
format_dev_t(md->name, MKDEV(_major, minor));
- md->wq = alloc_workqueue("kdmflush", WQ_MEM_RECLAIM, 0);
+ md->wq = alloc_workqueue("kdmflush/%s", WQ_MEM_RECLAIM, 0, md->name);
if (!md->wq)
goto bad;
--
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