linux-kernel - Re: [PATCH 0/6] perf trace: Add filter support

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Date:	Tue, 8 Sep 2009 08:53:55 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Li Zefan <lizf@...fujitsu.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Tom Zanussi <tzanussi@...il.com>,
	Jason Baron <jbaron@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/6] perf trace: Add filter support


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> On Tue, Sep 08, 2009 at 09:06:49AM +0800, Li Zefan wrote:
> > >> An example:
> > >>
> > >>  #./perf record -f -e irq:irq_handler_entry:irq==18:record
> > >>  or
> > >>  #./perf record -f -e irq:irq_handler_entry:irq==18 -R
> > >>  ^C
> > > 
> > > We may want to write complex filters. While looking at this patchset,
> > > that seems possible this way, but the raw line may become unreadable:
> > > 
> > > perf record -f -e irq:irq_handler_entry:"irq==18 && (name == 'foo' || bar == 'blah')":record
> > > 
> > > May be we should add an option to let one also set the filters seperately then
> > > we could do:
> > > 
> > > perf record -f -e -R irq:irq_handler_entry --filter "irq==18 && (name == 'foo' || bar == 'blah')"
> > > 
> > 
> > I had the same idea. ;)
> > 
> > But using this option, is it possible to specify different filters
> > for different events? like this:
> > 
> > perf record -f -e -R irq:irq_handler_entry --filter "irq==18"
> > -e irq:softirq_entry --filter "vec==1"
> > 
> 
> 
> Exactly how I was imagining it :)

Yes, that looks like a nice syntax. First the event, then the 
conditions that restrict its output.

	Ingo
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