Since torvalds/linux@6b59808bfe48 (workqueue: Show the latest
workqueue name in /proc/PID/{comm,stat,status}, 2018-05-18) the limit
of 15 character comm names hasn't applied to "kworker" processes. This
can be seen e.g. on my Linux v5.10 box:
$ awk '{print $2}' /proc/*/stat 2>/dev/null | grep kworker | sort -R | head -n 5
(kworker/3:1-mm_percpu_wq)
(kworker/0:0H-events_highpri)
(kworker/1:1H-kblockd)
(kworker/u16:1-events_unbound)
(kworker/u17:0)
Signed-off-by: Ævar Arnfjörð Bjarmason <avarab@xxxxxxxxx>
---
man5/proc.5 | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/man5/proc.5 b/man5/proc.5
index 115c8592e..b23dd1479 100644
--- a/man5/proc.5
+++ b/man5/proc.5
@@ -2092,9 +2092,13 @@ The filename of the executable, in parentheses. Tools such as
may alternatively (or additionally) use
.IR /proc/ pid /cmdline.
.IP
-Strings longer than
+For userspace, strings longer than
.B TASK_COMM_LEN
(16) characters (including the terminating null byte) are silently truncated.
+Since Linux version 4.18.0 a longer limit of 64 (including the
+terminating null byte) has applied to the kernel's own workqueue
+workers (whose names start with "kworker/").
+.IP
This is visible whether or not the executable is swapped out.
.TP
(3) \fIstate\fP \ %c
--
2.39.0.1106.gf45ba805d1a
