linux-kernel - Re: [PATCH 3/3] ftracetests: Add test to test event filter logic

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Date:	Wed, 3 Dec 2014 03:40:33 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Alexei Starovoitov <ast@...mgrid.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Theodore Tso <tytso@....edu>
Subject: Re: [PATCH 3/3] ftracetests: Add test to test event filter logic

On Tue, 2 Dec 2014 22:22:16 -0800
Alexei Starovoitov <ast@...mgrid.com> wrote:

> On Tue, Dec 2, 2014 at 7:13 PM, Steven Rostedt <rostedt@...dmis.org> wrote:
> > From: "Steven Rostedt (Red Hat)" <rostedt@...dmis.org>
> >
> > Add a test to test the event filter logic. It currently tests the
> > following filters against sched:sched_switch event.
> >
> >    ( prev_pid != 0 )
> >    ( prev_pid == 0 )
> >    ( prev_pid < 100 )
> >    ( prev_pid <= $$ )
> >    ( prev_pid > 100 )
> >    ( prev_pid >= $$ )
> >   ! ( prev_pid != 0 )
> >   ! ( prev_pid == 0 )
> >   ! ( prev_pid < 100 )
> >   ! ( prev_pid <= $$ )
> >   ! ( prev_pid > 100 )
> >   ! ( prev_pid >= $$ )
> >    ( prev_pid != 0 && next_pid > 10 )
> >    ( prev_pid != 0 || next_pid > 10 )
> >   ! ( prev_pid != 0 && next_pid > 10 )
> >   ! ( prev_pid != 0 || next_pid > 10 )
> >    ( prev_pid & 1 )
> >    ( prev_pid & 2 )
> >    ( prev_pid & 4 )
> >    ( prev_pid & 8 )
> >    ( prev_pid & 16 )
> >   ! ( prev_pid & 1 )
> >   ! ( prev_pid & 2 )
> >   ! ( prev_pid & 4 )
> >   ! ( prev_pid & 8 )
> >   ! ( prev_pid & 16 )
> >    ( next_comm ~ "ftrace-test-fil" )
> >    ( next_comm != "ftrace-test-fil" )
> >   ! ( next_comm ~ "ftrace-test-fil" )
> >   ! ( next_comm != "ftrace-test-fil" )
> 
> thanks for the tests!
> Since you're adding full support for 'not',
> I think would be good to have few more tests
> where ! is not a top node. Like:
> (prev_pid != 0 && !(next_pid & 2))
> and another one with ! at multiple levels, like:
> (prev_pid != 0 && !(next_pid != 2 && !(prev_pid > 3)))
> ... or reject them during parsing.

Sure, would you like to add them :-)

I spent more time on this than I should have. I have other things to
work on and this little project has already put me behind on my other
tasks.

-- Steve
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