linux-kernel - Re: [PATCH v6 0/8] perf cs-etm: Add support for sample flags

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Date:   Wed, 23 Jan 2019 17:22:03 -0700
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Leo Yan <leo.yan@...aro.org>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Suzuki K Poulose <suzuki.poulose@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Mike Leach <mike.leach@...aro.org>,
        Robert Walker <robert.walker@....com>,
        linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Coresight ML <coresight@...ts.linaro.org>
Subject: Re: [PATCH v6 0/8] perf cs-etm: Add support for sample flags

On Fri, 18 Jan 2019 at 18:44, Leo Yan <leo.yan@...aro.org> wrote:
>
> This patch seris adds support for sample flags so can facilitate perf
> to print sample flags for branch instruction.
>
> Patch 0001 is used to save last branch information in packet structure,
> this includes instruction type, subtype and condition flag to help
> making decision for which branch instruction it is.  It passes related
> information from decoder layer to cs-etm.c, so we use cs-etm.c as a
> central place to set sample flags.
>
> Patch 0002 is used to set sample flags for instruction range packet.
>
> Patch 0003 is used to set sample flags for trace discontinuity packet.
>
> Patches 0004/0005/0006 are preparation for exception packet handling:
> Patch 0004 addes exception number in packet; pacth 0005/0006 is to use
> traceID/metadata tuple to access metadata pointer based on traceID, this
> can help decide if the CPU is connected with ETMv3 or ETMv4, ETMv3 and
> ETMv4 have totally different definition for exception numbers.
>
> Patch 0007 sets sample flags for exception packet; patch 0008 support
> sample flags for exception return packet.
>
> This patch series is applied on the acme's perf core branch with the
> with latest commit 02bb912ae451 ("perf tools: Replace automatic const
> char[] variables by statics").
>
> After applying this patch series, we can verify sample flags with below
> command:
>
>   # perf script -F,-time,+flags,+ip,+sym,+dso,+addr,+symoff -k vmlinux

Since you are going for another iteration please add a "before" and
"after" example.

Thanks,
Mathieu


>
> Changes from v5:
> * Addressed Rob's suggestion to add specification info for exception
>   number encoding;
> * Added Rob's review tag in patch 0007.
>
> Changes from v4:
> * Fixed typos in comments, and removed redundant info from commit log;
> * Addressed Mathieu's suggestion to add helper functions for metadata
>   fields (CS_ETM_CPU and CS_ETM_MAGIC) accessing;
> * Addressed Mathieu's suggestion to include headers with alphabetical
>   order.
>
> Changes from v3:
> * Fixed typos in commit logs;
> * Rearranged fields in cs_etm_packet by grouping with same variable
>   types;
> * Fixed ETMv4 exception number which pointed by Mike;
> * Fixed ETMv4 SVC / SMC / HVC in the same CALL, by checking svc
>   instruction to distinguish them;
> * Refine ETMv4 return exception packet handling.
>
> Changes from v2:
> * Addressed Mathieu's suggestion to split one big patch to 3 small
>   patches for setting sample flags, one is for instruction range
>   packet, one is for discontinuity packet and one is for exception
>   packet.
> * Added supporting for ETMv3 exception packet.
> * Followed Mathieu's suggestion to move all sample flags handling
>   from decoder layer to cs-etm.c, thus it has enough info to set flags
>   based on trace context in single place.
>
> Changes from v1:
> * Moved exception packets handling patches into patch series 'perf
>   cs-etm: Correct packets handling'.
> * Added sample flags fixing up for TRACE_OFF packet.
> * Created a new function which is used to maintain flags fixing up.
>
>
> Leo Yan (8):
>   perf cs-etm: Add last instruction information in packet
>   perf cs-etm: Set sample flags for instruction range packet
>   perf cs-etm: Set sample flags for trace discontinuity
>   perf cs-etm: Add exception number in exception packet
>   perf cs-etm: Change tuple from traceID-CPU# to traceID-metadata
>   perf cs-etm: Add traceID in packet
>   perf cs-etm: Set sample flags for exception packet
>   perf cs-etm: Set sample flags for exception return packet
>
>  .../perf/util/cs-etm-decoder/cs-etm-decoder.c |  41 +-
>  .../perf/util/cs-etm-decoder/cs-etm-decoder.h |   6 +
>  tools/perf/util/cs-etm.c                      | 405 +++++++++++++++++-
>  tools/perf/util/cs-etm.h                      |  48 ++-
>  4 files changed, 482 insertions(+), 18 deletions(-)
>
> --
> 2.17.1
>