linux-kernel - Re: [PATCH V6 08/17] perf tools: Add Intel PT support

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

Date:	Fri, 26 Jun 2015 12:08:18 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Adrian Hunter <adrian.hunter@...el.com>
Cc:	Ingo Molnar <mingo@...nel.org>, linux-kernel@...r.kernel.org,
	Jiri Olsa <jolsa@...hat.com>,
	Stephane Eranian <eranian@...gle.com>
Subject: Re: [PATCH V6 08/17] perf tools: Add Intel PT support

Em Fri, Jun 26, 2015 at 04:47:39PM +0300, Adrian Hunter escreveu:
> On 26/06/15 16:41, Arnaldo Carvalho de Melo wrote:
> >> Another thing, the intel_bts implementation does not support
> >> "instructions" samples because there is no timing information to
> >> use to create periodic samples.  But callchains are added only
> >> to "instructions" samples so there are no callchains in 'perf report'
> >> for intel_bts.  The call information is still available for
> > 
> > Humm, so IOW, what you say is that we should refuse to run 'record' when
> > asking for callchains and intel_bts?
> 
> 'record' can record other events at the same time which can have callchains.
> e.g.
> 
> 	perf record -g --per-thread -e intel_bts//u,branch-misses:u ls

Right, what I was trying to say is that there are combinations where one
can ask for a callchain in record, it will act as if it did what was
asked for but then when report runs, no callchain will be available.

I guess we can check for that situation and warn the user.

- Arnaldo
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/