From: Cyrill Gorcunov <gorcunov@gmail.com>
To: Andrey Vagin <avagin@openvz.org>
Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-doc@vger.kernel.org, Jonathan Corbet <corbet@lwn.net>,
Alexander Viro <viro@zeniv.linux.org.uk>,
Jeff Layton <jlayton@poochiereds.net>,
"J. Bruce Fields" <bfields@fieldses.org>,
Andrew Morton <akpm@linux-foundation.org>,
Pavel Emelyanov <xemul@parallels.com>
Subject: Re: [PATCH] proc: show locks in /proc/pid/fdinfo/X
Date: Fri, 6 Mar 2015 11:38:05 +0300 [thread overview]
Message-ID: <20150306083805.GD2263@moon> (raw)
In-Reply-To: <1425569838-20416-1-git-send-email-avagin@openvz.org>
On Thu, Mar 05, 2015 at 06:37:18PM +0300, Andrey Vagin wrote:
> Let's show locks which are associated with a file descriptor in
> its fdinfo file.
>
> Currently we don't have a reliable way to determine who holds a lock.
> We can find some information in /proc/locks, but PID which is reported
> there can be wrong. For example, a process takes a lock, then forks a
> child and dies. In this case /proc/locks contains the parent pid, which
> can be reused by another process.
>
> $ cat /proc/locks
> ...
> 6: FLOCK ADVISORY WRITE 324 00:13:13431 0 EOF
> ...
>
> $ ps -C rpcbind
> PID TTY TIME CMD
> 332 ? 00:00:00 rpcbind
>
...
Looks reasonable to me, thanks!
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
next prev parent reply other threads:[~2015-03-06 8:38 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-03-05 15:37 [PATCH] proc: show locks in /proc/pid/fdinfo/X Andrey Vagin
2015-03-05 19:11 ` Jeff Layton
2015-03-06 14:19 ` Andrew Vagin
2015-03-06 8:38 ` Cyrill Gorcunov [this message]
2015-03-06 14:41 ` J. Bruce Fields
2015-03-07 13:00 ` Jeff Layton
2015-03-11 22:08 ` Andrew Morton
2015-03-12 15:54 ` Andrew Vagin
2015-03-12 19:23 ` Andrew Morton
2015-03-12 21:31 ` Andrey Wagin
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