locks: Filter /proc/locks output on proc pid ns

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On busy container servers reading /proc/locks shows all the locks
created by all clients. This can cause large latency spikes. In my
case I observed lsof taking up to 5-10 seconds while processing around
50k locks. Fix this by limiting the locks shown only to those created
in the same pidns as the one the proc fs was mounted in. When reading
/proc/locks from the init_pid_ns proc instance then perform no
filtering

[ jlayton: reformat comments for 80 columns ]

Signed-off-by: Nikolay Borisov <kernel@kyup.com>
Suggested-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Jeff Layton <jlayton@redhat.com>

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Nikolay Borisov 2016-08-17 16:18:46 -04:00 • committed by Jeff Layton

parent 5ff132c07a

commit d67fd44f69

1 changed files with 18 additions and 3 deletions

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fs/locks.c

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