From: Matteo Croce <teknoraver@xxxxxxxx>
The 'subset=pid' option was added in commit 6814ef2d, document it.
This option mounts a procfs where only the numeric directories related
to the PIDs are present.
# mount -t proc proc_pid pid -o subset=pid
# mount |grep -w proc_pid
proc_pid on /tmp/proc/pid type proc (rw,relatime,subset=pid)
# ll -d pid/{1,$$,cmdline,version}
ls: cannot access 'pid/cmdline': No such file or directory
ls: cannot access 'pid/version': No such file or directory
dr-xr-xr-x. 9 root root 0 May 14 09:43 pid/1
dr-xr-xr-x. 9 root root 0 May 14 09:43 pid/25146
The only non-numeric entries in that procfs instance are
'self' and 'thread-self':
# ls pid |grep -vx '[[:digit:]]*'
self
thread-self
#
Signed-off-by: Matteo Croce <teknoraver@xxxxxxxx>
---
man/man5/proc.5 | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/man/man5/proc.5 b/man/man5/proc.5
index 8022ca49e..cdb4aa859 100644
--- a/man/man5/proc.5
+++ b/man/man5/proc.5
@@ -105,7 +105,12 @@ This group should be used instead of approaches such as putting
nonroot users into the
.BR sudoers (5)
file.
-.\"
+.RE
+.TP
+.BR subset = pid " (since Linux 5.8)"
+.\" commit 6814ef2d992af09451bbeda4770daa204461329e
+Show only the specified subset of procfs hiding all top level files
+and directories in the procfs that are not related to tasks.
.SS Overview
Underneath
.IR /proc ,
--
2.43.0
