linux-kernel - Re: [PATCH v2 00/17] perf tools: Coresight: Add CPU-wide trace support

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Date:   Fri, 31 May 2019 09:45:34 +0800
From:   Leo Yan <leo.yan@...aro.org>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     acme@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, suzuki.poulose@....com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        coresight@...ts.linaro.org
Subject: Re: [PATCH v2 00/17] perf tools: Coresight: Add CPU-wide trace
 support

On Fri, May 24, 2019 at 11:34:51AM -0600, Mathieu Poirier wrote:
> This patchset adds support for CoreSight CPU-wide trace scenarios.  More 
> specifically it extends the work that was done for per thread scenarios to
> handle more than a single trace ID.  It also temporally correlate traces
> based on timestamp generated by the tracers so that rendering by the perf
> mechanic is ordered.
> 
> Everything is based on Arnaldo's perf/core branch (46d4c9a05285).  I will
> send another revision when it is rebased to a 5.2 rc candidate.
> 
> Before this set:
> 	# root@...o:/home/linaro# perf record -e cs_etm/@...70000.etr/ -C 2,3 sleep 1
> 	failed to mmap with 12 (Cannot allocate memory)
> 
> After this set:
> 	# root@...o:/home/linaro# perf record -e cs_etm/@...70000.etr/ -C 2,3 sleep 1
> 	[ perf record: Captured and wrote 1.352 MB perf.data ]

I have tested this patch set on Juno and DB410c boards, FWIW:

Tested-by: Leo Yan <leo.yan@...aro.org>

> Regards,
> Mathieu
> 
> Changes for V2:
> * Fixed error condition in function cs_etm_set_option() (Leo)
> * Fixed changelog spelling error (Leo).
> * Moved from calloc() to malloc() in cs_etm__etmq_get_traceid_queue()
> * Got rid of CS_ETM_PACKET_QUEUE_NR macro
> * Fixed indentation problem in function cs_etm__process_traceid_queue() (Leo).
> 
> Mathieu Poirier (17):
>   perf tools: Configure contextID tracing in CPU-wide mode
>   perf tools: Configure timestsamp generation in CPU-wide mode
>   perf tools: Configure SWITCH_EVENTS in CPU-wide mode
>   perf tools: Add handling of itrace start events
>   perf tools: Add handling of switch-CPU-wide events
>   perf tools: Refactor error path in cs_etm_decoder__new()
>   perf tools: Move packet queue out of decoder structure
>   perf tools: Fix indentation in function
>     cs_etm__process_decoder_queue()
>   perf tools: Introduce the concept of trace ID queues
>   perf tools: Get rid of unused cpu in struct cs_etm_queue
>   perf tools: Move thread to traceid_queue
>   perf tools: Move tid/pid to traceid_queue
>   perf tools: Use traceID aware memory callback API
>   perf tools: Add support for multiple traceID queues
>   perf tools: Linking PE contextID with perf thread mechanic
>   perf tools: Add notion of time to decoding code
>   perf tools: Add support for CPU-wide trace scenarios
> 
>  tools/perf/Makefile.config                    |    3 +
>  tools/perf/arch/arm/util/cs-etm.c             |  186 ++-
>  .../perf/util/cs-etm-decoder/cs-etm-decoder.c |  269 +++--
>  .../perf/util/cs-etm-decoder/cs-etm-decoder.h |   39 +-
>  tools/perf/util/cs-etm.c                      | 1026 +++++++++++++----
>  tools/perf/util/cs-etm.h                      |  103 ++
>  6 files changed, 1252 insertions(+), 374 deletions(-)
> 
> -- 
> 2.17.1
>