linux-kernel - Re: [PATCH 03/16 v2] tracing: Add a proc file to stop tracing and free buffer

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1308148989.9218.127.camel@gandalf.stny.rr.com>
Date:	Wed, 15 Jun 2011 10:43:09 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Ingo Molnar <mingo@...hat.com>,
	Michael Rubin <mrubin@...gle.com>,
	David Sharp <dhsharp@...gle.com>,
	Vaibhav Nagarnaik <vnagarnaik@...gle.com>
Subject: Re: [PATCH 03/16 v2] tracing: Add a proc file to stop tracing and
 free buffer

On Wed, 2011-06-15 at 16:25 +0200, Frederic Weisbecker wrote:
> On Wed, Jun 15, 2011 at 09:48:44AM -0400, Steven Rostedt wrote:
> > From: Vaibhav Nagarnaik <vnagarnaik@...gle.com>
> > 
> > The proc file entry buffer_size_kb is used to set the size of tracing
> > buffer.
> >
> > The memory to expand the buffer size is kernel memory. Consider
> > a use case where tracing is handled by a user space utility, which acts
> > as a gate keeper for tracing requests. In an OOM condition, tracing is
> > considered a low priority task and if the utility gets killed the ring
> > buffer memory cannot be released back to the kernel.
> > 
> > This patch adds a proc file called "free_buffer" whose purpose is to
> > stop tracing and free up the ring buffer when it is closed.
> > 

> 
> s/proc/debugfs, right?

Oops, I didn't even notice it said that. But you are correct, the patch
adds a debugfs not a proc file.

Not sure it's worth redoing for the changelog though :-/

-- Steve



--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/