linux-kernel - Re: [PATCH v2 00/10] perf tools: Add support for CoreSight trace decoding

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Date:   Tue, 16 Jan 2018 13:17:19 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Mathieu Poirier <mathieu.poirier@...aro.org>
Cc:     acme@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
        adrian.hunter@...el.com, mike.leach@....com,
        suzuki.poulosi@....com, kim.phillips@....com,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 00/10] perf tools: Add support for CoreSight trace
 decoding

On Mon, Jan 15, 2018 at 11:13:04AM -0700, Mathieu Poirier wrote:
> Hi Arnaldo,
> 
> This patchset adds support for per-thread CoreSight trace decoding from the
> "perf report" interface.  It is largely modelled on what has been done for
> intelPT traces and currently targets the ETMv4 architecture.  Support for
> cpu-wide scenarios and ETMv3/PTMv1.1 will follow shortly.
> 
> The trace decoding support is done using the Open CoreSight Decoding
> Library (openCSD), a stand alone open source project available here [1].
> Integration of the openCSD library with the perf tools follow what has
> been done for other support libraries.  If the library has been installed
> on a system the build scripts will include support for CoreSight trace
> decoding:
> 
> ...			zlib: [ on  ]
> ...			lzma: [ OFF ]
> ...			get_cpuid: [ on  ]
> ...			bpf: [ on  ]
> ...			libopencsd: [ on  ] <------
> 
> Instructions on how to build and install the openCSD library are provided
> in the HOWTO.md of the project repository.  We elected to keep the decoder
> library independent of the kernel tree as it is also used outside of the
> perf toolset and various non-linux projects.
> 
> The work applies cleanly to [2] and depend on the following patches [3, 4].
> 
> Lastly there is a divergence of opinions on whether the decoding library
> should be part of the kernel tree or live on its own as we chose to do -
> your point of view on the matter would be greatly appreciated.
> 
> Regards,
> Mathieu
> 
> [1]. https://github.com/Linaro/OpenCSD
> [2]. git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux.git perf/core
> [3]. https://marc.info/?l=linux-kernel&m=151561673423088&w=2
> [4]. https://marc.info/?l=linux-kernel&m=151579875721440&w=2 
> 
> Changes for V2:
> . Rebased to Acme's latest (321e85e9458a)
> . Following what has been done for libdw and libbabeltrace and added the
>   possibililty to use alternate header/library for development purposes.
> 
> Mathieu Poirier (8):
>   perf tools: Integrating the CoreSight decoding library
>   perf tools: Add initial entry point for decoder CoreSight traces
>   perf tools: Add decoder mechanic to support dumping trace data
>   perf tools: Add support for decoding CoreSight trace data
>   perf tools: Add functionality to communicate with the openCSD decoder
>   pert tools: Add queue management functionality
>   perf tools: Add full support for CoreSight trace decoding
>   perf tools: Add mechanic to synthesise CoreSight trace packets
> 
> Tor Jeremiassen (2):
>   perf tools: Add processing of coresight metadata
>   MAINTAINERS: Adding entry for CoreSight trace decoding

apart from those builds nits no objections

jirka