From: ebiederm-aS9lmoZGLiVWk0Htik3J/w@public.gmane.org (Eric W. Biederman) To: Nikolay Borisov <kernel-6AxghH7DbtA@public.gmane.org> Cc: serge.hallyn-Z7WLFzj8eWMS+FvcfC7Uqw@public.gmane.org, containers-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, bfields-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org, viro-RmSDqhL/yNMiFSDQTTA3OLVCufUGDwFn@public.gmane.org, linux-fsdevel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, jlayton-vpEMnDpepFuMZCB2o+C8xQ@public.gmane.org Subject: Re: [RFC PATCH] locks: Show only file_locks created in the same pidns as current process Date: Tue, 02 Aug 2016 11:00:39 -0500 [thread overview] Message-ID: <87r3a7qhy0.fsf@x220.int.ebiederm.org> (raw) In-Reply-To: <1470148943-21835-1-git-send-email-kernel-6AxghH7DbtA@public.gmane.org> (Nikolay Borisov's message of "Tue, 2 Aug 2016 17:42:23 +0300") Nikolay Borisov <kernel-6AxghH7DbtA@public.gmane.org> writes: > Currently when /proc/locks is read it will show all the file locks > which are currently created on the machine. On containers, hosted > on busy servers this means that doing lsof can be very slow. I > observed up to 5 seconds stalls reading 50k locks, while the container > itself had only a small number of relevant entries. Fix it by > filtering the locks listed by the pidns of the current process > and the process which created the lock. The locks always confuse me so I am not 100% connecting locks to a pid namespace is appropriate. That said if you are going to filter by pid namespace please use the pid namespace of proc, not the pid namespace of the process reading the file. Different contents of files depending on who opens them is generally to be discouraged. Eric > Signed-off-by: Nikolay Borisov <kernel-6AxghH7DbtA@public.gmane.org> > --- > fs/locks.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/fs/locks.c b/fs/locks.c > index 6333263b7bc8..53e96df4c583 100644 > --- a/fs/locks.c > +++ b/fs/locks.c > @@ -2615,9 +2615,17 @@ static int locks_show(struct seq_file *f, void *v) > { > struct locks_iterator *iter = f->private; > struct file_lock *fl, *bfl; > + struct pid_namespace *pid_ns = task_active_pid_ns(current); > + > > fl = hlist_entry(v, struct file_lock, fl_link); > > + pr_info ("Current pid_ns: %p init_pid_ns: %p, fl->fl_nspid: %p nspidof:%p\n", pid_ns, &init_pid_ns, > + fl->fl_nspid, ns_of_pid(fl->fl_nspid)); > + if ((pid_ns != &init_pid_ns) && fl->fl_nspid && > + (pid_ns != ns_of_pid(fl->fl_nspid))) > + return 0; > + > lock_get_status(f, fl, iter->li_pos, ""); > > list_for_each_entry(bfl, &fl->fl_block, fl_block)
WARNING: multiple messages have this Message-ID (diff)
From: ebiederm@xmission.com (Eric W. Biederman) To: Nikolay Borisov <kernel@kyup.com> Cc: jlayton@poochiereds.net, viro@zeniv.linux.org.uk, bfields@fieldses.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, containers@lists.linux-foundation.org, serge.hallyn@canonical.com Subject: Re: [RFC PATCH] locks: Show only file_locks created in the same pidns as current process Date: Tue, 02 Aug 2016 11:00:39 -0500 [thread overview] Message-ID: <87r3a7qhy0.fsf@x220.int.ebiederm.org> (raw) In-Reply-To: <1470148943-21835-1-git-send-email-kernel@kyup.com> (Nikolay Borisov's message of "Tue, 2 Aug 2016 17:42:23 +0300") Nikolay Borisov <kernel@kyup.com> writes: > Currently when /proc/locks is read it will show all the file locks > which are currently created on the machine. On containers, hosted > on busy servers this means that doing lsof can be very slow. I > observed up to 5 seconds stalls reading 50k locks, while the container > itself had only a small number of relevant entries. Fix it by > filtering the locks listed by the pidns of the current process > and the process which created the lock. The locks always confuse me so I am not 100% connecting locks to a pid namespace is appropriate. That said if you are going to filter by pid namespace please use the pid namespace of proc, not the pid namespace of the process reading the file. Different contents of files depending on who opens them is generally to be discouraged. Eric > Signed-off-by: Nikolay Borisov <kernel@kyup.com> > --- > fs/locks.c | 8 ++++++++ > 1 file changed, 8 insertions(+) > > diff --git a/fs/locks.c b/fs/locks.c > index 6333263b7bc8..53e96df4c583 100644 > --- a/fs/locks.c > +++ b/fs/locks.c > @@ -2615,9 +2615,17 @@ static int locks_show(struct seq_file *f, void *v) > { > struct locks_iterator *iter = f->private; > struct file_lock *fl, *bfl; > + struct pid_namespace *pid_ns = task_active_pid_ns(current); > + > > fl = hlist_entry(v, struct file_lock, fl_link); > > + pr_info ("Current pid_ns: %p init_pid_ns: %p, fl->fl_nspid: %p nspidof:%p\n", pid_ns, &init_pid_ns, > + fl->fl_nspid, ns_of_pid(fl->fl_nspid)); > + if ((pid_ns != &init_pid_ns) && fl->fl_nspid && > + (pid_ns != ns_of_pid(fl->fl_nspid))) > + return 0; > + > lock_get_status(f, fl, iter->li_pos, ""); > > list_for_each_entry(bfl, &fl->fl_block, fl_block)
next prev parent reply other threads:[~2016-08-02 16:00 UTC|newest] Thread overview: 62+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-08-02 14:42 [RFC PATCH] locks: Show only file_locks created in the same pidns as current process Nikolay Borisov 2016-08-02 14:42 ` Nikolay Borisov [not found] ` <1470148943-21835-1-git-send-email-kernel-6AxghH7DbtA@public.gmane.org> 2016-08-02 14:45 ` Nikolay Borisov 2016-08-02 14:45 ` Nikolay Borisov 2016-08-02 15:05 ` J. Bruce Fields 2016-08-02 16:00 ` Eric W. Biederman [this message] 2016-08-02 16:00 ` Eric W. Biederman [not found] ` <87r3a7qhy0.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-08-02 17:40 ` J. Bruce Fields 2016-08-02 17:40 ` J. Bruce Fields [not found] ` <20160802174003.GD11767-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org> 2016-08-02 19:09 ` Eric W. Biederman 2016-08-02 19:09 ` Eric W. Biederman [not found] ` <87invjq97h.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-08-02 19:44 ` J. Bruce Fields 2016-08-02 19:44 ` J. Bruce Fields [not found] ` <20160802194437.GD15324-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org> 2016-08-02 20:01 ` Jeff Layton 2016-08-02 20:01 ` Jeff Layton [not found] ` <1470168082.15226.14.camel-vpEMnDpepFuMZCB2o+C8xQ@public.gmane.org> 2016-08-02 20:11 ` Nikolay Borisov 2016-08-02 20:11 ` Nikolay Borisov 2016-08-02 20:34 ` J. Bruce Fields 2016-08-02 20:34 ` J. Bruce Fields 2016-08-03 7:35 ` [PATCH v2] locks: Filter /proc/locks output on proc pid ns Nikolay Borisov 2016-08-03 7:35 ` Nikolay Borisov [not found] ` <1470209710-30022-1-git-send-email-kernel-6AxghH7DbtA@public.gmane.org> 2016-08-03 13:46 ` Jeff Layton 2016-08-03 13:46 ` Jeff Layton [not found] ` <1470232012.18285.4.camel-vpEMnDpepFuMZCB2o+C8xQ@public.gmane.org> 2016-08-03 14:17 ` Nikolay Borisov 2016-08-03 14:17 ` Nikolay Borisov 2016-08-03 14:28 ` J. Bruce Fields [not found] ` <20160803142850.GA27072-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org> 2016-08-03 14:33 ` Nikolay Borisov 2016-08-03 14:33 ` Nikolay Borisov [not found] ` <57A1FCE5.3040206-6AxghH7DbtA@public.gmane.org> 2016-08-03 14:28 ` J. Bruce Fields 2016-08-03 14:54 ` Pavel Emelyanov 2016-08-03 14:54 ` Pavel Emelyanov [not found] ` <57A205BE.3070202-5HdwGun5lf+gSpxsJD1C4w@public.gmane.org> 2016-08-03 15:00 ` Nikolay Borisov 2016-08-03 15:00 ` Nikolay Borisov [not found] ` <57A20702.3040805-6AxghH7DbtA@public.gmane.org> 2016-08-03 15:06 ` J. Bruce Fields 2016-08-03 15:06 ` J. Bruce Fields [not found] ` <20160803150631.GA3789-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org> 2016-08-03 15:10 ` Nikolay Borisov 2016-08-03 15:10 ` Nikolay Borisov [not found] ` <57A2097C.7060206-6AxghH7DbtA@public.gmane.org> 2016-08-03 17:35 ` Eric W. Biederman 2016-08-03 17:35 ` Eric W. Biederman 2016-08-03 14:54 ` [PATCHv3] " Nikolay Borisov [not found] ` <1470236078-2389-1-git-send-email-kernel-6AxghH7DbtA@public.gmane.org> 2016-08-03 15:24 ` Jeff Layton 2016-08-03 16:23 ` Eric W. Biederman [not found] ` <87k2fxom8a.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-08-03 16:50 ` Jeff Layton [not found] ` <1470243015.13804.7.camel-vpEMnDpepFuMZCB2o+C8xQ@public.gmane.org> 2016-08-03 21:09 ` Eric W. Biederman [not found] ` <87twf1ftk9.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-08-03 21:26 ` Nikolay Borisov [not found] ` <a0a58f75-0e40-c14f-d8e3-8f094e9fc62c-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> 2016-08-04 4:18 ` Eric W. Biederman [not found] ` <87eg659ngh.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-08-04 5:07 ` Eric W. Biederman 2016-08-03 17:40 ` Eric W. Biederman 2016-08-04 7:26 ` [PATCHv4] " Nikolay Borisov [not found] ` <1470295588-9803-1-git-send-email-kernel-6AxghH7DbtA@public.gmane.org> 2016-08-04 11:29 ` Jeff Layton [not found] ` <1470310175.22052.3.camel-vpEMnDpepFuMZCB2o+C8xQ@public.gmane.org> 2016-08-04 14:09 ` Eric W. Biederman [not found] ` <874m707hhm.fsf-JOvCrm2gF+uungPnsOpG7nhyD016LWXt@public.gmane.org> 2016-08-04 14:34 ` Nikolay Borisov 2016-08-04 15:09 ` Nikolay Borisov [not found] ` <57A35AC7.7040105-6AxghH7DbtA@public.gmane.org> 2016-08-04 15:21 ` Eric W. Biederman 2016-08-05 7:30 ` [PATCHv5] " Nikolay Borisov [not found] ` <1470382204-21480-1-git-send-email-kernel-6AxghH7DbtA@public.gmane.org> 2016-08-05 10:47 ` Jeff Layton [not found] ` <1470394036.8100.2.camel-vpEMnDpepFuMZCB2o+C8xQ@public.gmane.org> 2016-08-05 14:58 ` J. Bruce Fields 2016-08-02 15:05 ` [RFC PATCH] locks: Show only file_locks created in the same pidns as current process J. Bruce Fields [not found] ` <20160802150521.GB11767-uC3wQj2KruNg9hUCZPvPmw@public.gmane.org> 2016-08-02 15:20 ` Nikolay Borisov 2016-08-02 15:20 ` Nikolay Borisov [not found] ` <57A0BA40.5010406-6AxghH7DbtA@public.gmane.org> 2016-08-02 15:43 ` J. Bruce Fields 2016-08-02 15:43 ` J. Bruce Fields
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