linux-kernel - RE: [PATCH] perf tools: set no branch type for dummy event in PT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <37D7C6CF3E00A74B8858931C1DB2F07753714794@SHSMSX103.ccr.corp.intel.com>
Date:   Fri, 30 Jun 2017 14:01:56 +0000
From:   "Liang, Kan" <kan.liang@...el.com>
To:     Jiri Olsa <jolsa@...hat.com>
CC:     "acme@...nel.org" <acme@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "mingo@...hat.com" <mingo@...hat.com>,
        "peterz@...radead.org" <peterz@...radead.org>,
        "Hunter, Adrian" <adrian.hunter@...el.com>,
        "alexander.shishkin@...ux.intel.com" 
        <alexander.shishkin@...ux.intel.com>,
        "ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: RE: [PATCH] perf tools: set no branch type for dummy event in PT



> On Thu, Jun 29, 2017 at 03:50:29PM +0000, Liang, Kan wrote:
> >
> >
> > >
> > > On Thu, Jun 29, 2017 at 03:31:45PM +0000, Liang, Kan wrote:
> > >
> > > SNIP
> > >
> > > > > >  static int intel_pt_recording_options(struct auxtrace_record *itr,
> > > > > >  				      struct perf_evlist *evlist,
> > > > > >  				      struct record_opts *opts) @@ -
> 701,6
> > > +717,8 @@ static
> > > > > > int intel_pt_recording_options(struct
> > > > > auxtrace_record *itr,
> > > > > >
> 	perf_evsel__set_sample_bit(switch_evsel,
> > > > > TIME);
> > > > > >
> 	perf_evsel__set_sample_bit(switch_evsel,
> > > > > CPU);
> > > > > >
> > > > > > +
> 	add_no_lbr_config_term(&switch_evsel-
> > > > > >config_terms);
> > > > > > +
> > > > >
> > > > > hum, why can't you change the sample bit directly? with:
> > > > >
> > > > > 			perf_evsel__reset_sample_bit(switch_evsel,
> > > > > BRANCH_STACK);
> > > >
> > > > It will be overwrite in perf_evsel__config.
> > > >
> > >
> > > where? you set the evsel->no_aux_samples
> >
> > Yes for switch_evsel, but no for tracking_evsel.
> >
> > If it's only for switch_evsel, yes, we can change the sample bit directly.
> > But I think we should use the same method for both of them.
> 
> 
> we could set the no_aux_samples for the tracking_evsel as well
> 

Yes, I will do it in next version.

Thanks,
Kan