linux-kernel - Re: [PATCH 1/3] perf, pt, coresight: Clean up address filter structure

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Message-ID: <20180118170633.GG12394@arm.com>
Date:   Thu, 18 Jan 2018 17:06:33 +0000
From:   Will Deacon <will.deacon@....com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Ingo Molnar <mingo@...hat.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Vince Weaver <vince@...ter.net>,
        Stephane Eranian <eranian@...gle.com>,
        Arnaldo Carvalho de Melo <acme@...radead.org>,
        Mark Rutland <mark.rutland@....com>
Subject: Re: [PATCH 1/3] perf, pt, coresight: Clean up address filter
 structure

On Thu, Jan 18, 2018 at 09:59:26AM -0700, Mathieu Poirier wrote:
> On 17 January 2018 at 05:31, Alexander Shishkin
> <alexander.shishkin@...ux.intel.com> wrote:
> > On Tue, Feb 07, 2017 at 10:50:50AM -0700, Mathieu Poirier wrote:
> >> > index 39106ae61b..d7a11faac1 100644
> >> > --- a/kernel/events/core.c
> >> > +++ b/kernel/events/core.c
> >> > @@ -8194,7 +8194,8 @@ static void perf_event_addr_filters_apply(struct perf_event *event)
> >> >   *  * for kernel addresses: <start address>[/<size>]
> >> >   *  * for object files:     <start address>[/<size>]@</path/to/object/file>
> >> >   *
> >> > - * if <size> is not specified, the range is treated as a single address.
> >> > + * if <size> is not specified or is zero, the range is treated as a single
> >> > + * address; not valid for ACTION=="filter".
> >>
> >> Now that a size of 0 can't be specified with a "filter" action, I'm
> >> good with that statement.
> >
> > Hi Mathieu, I completely lost track of this.
> >
> > Following is the commit I found dangilng in one of my local branches.
> > Does this make sense to you? Thanks!
> 
> Oh boy!  That's a whole year ago...  Give me some time to wrap my
> brain around it again.

Do we need anything for SPE, or is this only applicable to certain types of
tracing PMUs?

Will