linux-kernel - Re: [PATCH] cgroup: add tracepoints to track cgroup events

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Message-ID: <20140821194514.0e97b26a@gandalf.local.home>
Date:	Thu, 21 Aug 2014 19:45:14 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	Andrea Righi <andrea@...terlinux.com>,
	Li Zefan <lizefan@...wei.com>, Ingo Molnar <mingo@...hat.com>,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
	Matt Heaton <matt@...terlinux.com>
Subject: Re: [PATCH] cgroup: add tracepoints to track cgroup events

On Thu, 21 Aug 2014 12:07:01 -0500
Tejun Heo <tj@...nel.org> wrote:

> Hello, Anrea.
> 
> On Thu, Aug 21, 2014 at 11:00:02AM -0600, Andrea Righi wrote:
> > hmm... am I missing something or we already support directory events?
> 
> Ah, right, those mkdir/rmdir and writes automatically generate those
> events.
> 
> > root@...l:~# grep cgroups /proc/mounts
> > none /cgroups cgroup rw,relatime,cpuset,cpu,cpuacct,memory,devices,freezer,perf_event,hugetlb 0 0
> > root@...l:~# inotifywait -m -r -e modify -e move -e create -e delete /cgroups
> > Setting up watches.  Beware: since -r was given, this may take a while!
> > Watches established.
> > /cgroups/ CREATE,ISDIR test
> > /cgroups/test/ MODIFY cgroup.procs
> > /cgroups/test/ MODIFY cgroup.procs
> > /cgroups/test/ MODIFY cgroup.populated
> > /cgroups/ MODIFY cgroup.procs
> > /cgroups/ MODIFY cgroup.procs
> > /cgroups/test/ MODIFY cgroup.populated
> > /cgroups/ DELETE,ISDIR test
> > 
> > I still need to figure out a smart way to track which PIDs are
> > added/removed to/from cgroup.procs from userland (inotifywait + git? :)),
> > but all the other informations provided by my tracepoint patch seem to
> > be already available via [di]notify.
> 
> Hmmm... yeah, determining exactly which pids got added / removed can
> be cumbersome from just MODIFY events.  That said, what are you trying
> to do with such information?
> 

OK, is this patch not being pushed then? I have a lot of comments to
make about it, but if this patch is being dropped for another way of
doing things I wont waste my time on it.

Thanks,

-- Steve
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