linux-kernel - Re: [PATCH 01/11] perf intel-pt: Add new packets for PEBS via PT

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Date:   Wed, 12 Jun 2019 10:28:52 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>,
        Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
        Peter Zijlstra <peterz@...radead.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Subject: Re: [PATCH 01/11] perf intel-pt: Add new packets for PEBS via PT

Em Wed, Jun 12, 2019 at 03:52:11PM +0300, Adrian Hunter escreveu:
> On 12/06/19 3:41 PM, Arnaldo Carvalho de Melo wrote:
> > Em Wed, Jun 12, 2019 at 08:58:00AM +0300, Adrian Hunter escreveu:
> >> On 12/06/19 3:09 AM, Arnaldo Carvalho de Melo wrote:
> >>> Em Mon, Jun 10, 2019 at 10:27:53AM +0300, Adrian Hunter escreveu:
> >>>> Add 3 new packets to supports PEBS via PT, namely Block Begin Packet (BBP),
> >>>> Block Item Packet (BIP) and Block End Packet (BEP). PEBS data is encoded
> >>>> into multiple BIP packets that come between BBP and BEP. The BEP packet
> >>>> might be associated with a FUP packet. That is indicated by using a
> >>>> separate packet type (INTEL_PT_BEP_IP) similar to other packets types with
> >>>> the _IP suffix.
> >>>>
> >>>> Refer to the Intel SDM for more information about PEBS via PT.
> >>>
> >>> In these cases would be nice to provide an URL and page number, for
> >>> convenience.
> >>
> >> Intel SDM:
> >>
> >> 	https://software.intel.com/en-us/articles/intel-sdm
> >>
> >> May 2019 version: Vol. 3B 18.5.5.2 PEBS output to Intel® Processor Trace
> > 
> > Thanks! I'll add to that cset.
> > 
> > What about the kernel bits?
> 
> Awaiting V2, here is a link to the patches:
> 
> 	https://lore.kernel.org/lkml/20190502105022.15534-1-alexander.shishkin@linux.intel.com/

yeah, I saw those and PeterZ's comments, that is why I asked about them
:-)
 
> There is also still a few more tools changes dependent upon the kernel patches.

But I think I can go ahead and push the decoder bits, when the kernel
patches get merged we'll be almost ready to make full use of what it
provides, right?

- Arnaldo