linux-kernel - Re: [for-next][PATCH 08/12] tracing: Add binary & filter for events

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Date:	Thu, 20 Jun 2013 14:38:30 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Arend van Spriel <arend@...adcom.com>
Cc:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [for-next][PATCH 08/12] tracing: Add binary & filter for events

On Thu, 2013-06-20 at 14:34 -0400, Steven Rostedt wrote:
> On Thu, 2013-06-20 at 20:28 +0200, Arend van Spriel wrote:
> 
> > Reading the whole text with your remark in mind, I guess it does 
> > indicate there are no guarantees depending on the kernel and the list of 
> > operators are what trace-cmd supports. I overlooked/ignored the text 
> > seeing the operators.
> 
> Exactly, which means that if you over looked the text, so has others.
> The text 
> should be changed to make it more comprehensible.
> 

Would this change have helped you catch this?

diff --git a/Documentation/trace-cmd-record.1.txt b/Documentation/trace-cmd-record.1.txt
index b95e1b4..9ef1e2a 100644
--- a/Documentation/trace-cmd-record.1.txt
+++ b/Documentation/trace-cmd-record.1.txt
@@ -79,10 +79,12 @@ OPTIONS
     let you use C notation to check if an event should be processed or not.
 
 ----------------------------------------
-    ==, >=, <=, >, <, &, |, && and ||
+    ==, >=, <=, >, <, &, ~, && and ||
 ----------------------------------------
 
-    The above are usually safe to use to compare fields.
+    Note, not all of the above operators may work with all kernels.
+    The filter is passed directly to the kernel and is dependent on the
+    kernel supporting the operators.
 
 *-v*::
     This will cause all events specified after it on the command line to not

-- Steve

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