linux-kernel - Re: [PATCH 00/16 v3] tracing: Add new file system tracefs

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Message-ID: <20150126213419.531774eb@grimm.local.home>
Date:	Mon, 26 Jan 2015 21:34:19 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Al Viro <viro@...IV.linux.org.uk>
Cc:	linux-kernel@...r.kernel.org,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH 00/16 v3] tracing: Add new file system tracefs

On Mon, 26 Jan 2015 18:37:39 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:


> > the first call of tracing_init_dentry().  Prior to that it's NULL.
> > BTW, may I politely inquire what the fuck are those contortions in
> > tracing_init_dentry_tr() about?  Looks like a stunningly convoluted
> > way to trigger that automount point creation early in
> > tracer_init_tracefs(). Why not do that right there explicitly?
> 
> Yeah, that could be cleaned up. Before the tracefs code, it made much
> more sense to keep that as a single function. Now that
> global_array.dir is treated differently as the subdirs, it does make
> sense to have global_arry.dir initialized in a separate function.
> 
> I'll update my patch series to do this.

Now I remember why I did this (as I changed the code and everything
blew up). The files in the tracing directory can be created by several
users (do a grep for fs_initcall() in kernel/trace/*.c). The first
caller to add a file initializes the tracing directory.

I guess I can have all the other callers use fs_initcall_sync(). I'm
assuming those come after fs_initcall().

-- Steve
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