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

[Arend van Spriel]

On 06/20/2013 05:35 AM, Steven Rostedt wrote:
> By allowing a binary '&' operation, this gives the user the ability to
> test a bit.
>
> Note, a binary '|' is not added, as it doesn't make sense as fields must
> be compared to constants (for now), and ORing a constant will always return
> true.
>
> Link:http://lkml.kernel.org/r/1371057385.9844.261.camel@xxxxxxxxxxxxxxxxxx
>
> Suggested-by: Arend van Spriel<arend@xxxxxxxxxxxx>

Actually, my attempt was triggered by the trace-cmd manual page:

"-f filter
Specify a filter for the previous event. This must come after a -e. This 
will filter what events get recorded based on the content of the event. 
Filtering is passed to the kernel directly so what filtering is allowed 
may depend on what version of the kernel you have. Basically, it will 
let you use C notation to check if an event should be processed or not.

==, >=, <=, >, <, &, |, && and ||

The above are usually safe to use to compare fields."

> Tested-by: Arend van Spriel<arend@xxxxxxxxxxxx>
> Signed-off-by: Steven Rostedt<rostedt@xxxxxxxxxxx>

Regards,
Arend

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