[PATCH 2/2] proc.5: the "comm" field can be longer than 16 bytes

["Ævar Arnfjörð Bjarmason" <avarab@gmail.com>]

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@gmail.com>
---
 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