linux-kernel - Re: [PATCH v2 4/6] Documentation: coresight: Turn numbered subsections into real subsections

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Date:   Fri, 21 Jan 2022 12:47:05 +0000
From:   Mike Leach <mike.leach@...aro.org>
To:     James Clark <James.Clark@....com>
Cc:     suzuki.poulose@....com, mathieu.poirier@...aro.org,
        coresight@...ts.linaro.org, leo.yan@...aro.com,
        Leo Yan <leo.yan@...aro.org>,
        John Garry <john.garry@...wei.com>,
        Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v2 4/6] Documentation: coresight: Turn numbered
 subsections into real subsections

Reviewed-by: Mike Leach <mike.leach@...aro.org>

On Thu, 13 Jan 2022 at 09:11, James Clark <james.clark@....com> wrote:
>
> This is to allow them to be referenced in a later commit. There was
> also a mistake where sysFS was introduced as section 2, but numbered
> as section 1. And vice versa for 'Using perf framework'. This can't
> happen with unnumbered sections.
>
> Signed-off-by: James Clark <james.clark@....com>
> ---
>  Documentation/trace/coresight/coresight.rst | 17 ++++++++++++-----
>  1 file changed, 12 insertions(+), 5 deletions(-)
>
> diff --git a/Documentation/trace/coresight/coresight.rst b/Documentation/trace/coresight/coresight.rst
> index a15571d96cc8..db66ff45ff4c 100644
> --- a/Documentation/trace/coresight/coresight.rst
> +++ b/Documentation/trace/coresight/coresight.rst
> @@ -339,7 +339,8 @@ Preference is given to the former as using the sysFS interface
>  requires a deep understanding of the Coresight HW.  The following sections
>  provide details on using both methods.
>
> -1) Using the sysFS interface:
> +Using the sysFS interface
> +~~~~~~~~~~~~~~~~~~~~~~~~~
>
>  Before trace collection can start, a coresight sink needs to be identified.
>  There is no limit on the amount of sinks (nor sources) that can be enabled at
> @@ -446,7 +447,8 @@ wealth of possibilities that coresight provides.
>      Instruction     0       0x8026B588      E8BD8000        true    LDM      sp!,{pc}
>      Timestamp                                       Timestamp: 17107041535
>
> -2) Using perf framework:
> +Using perf framework
> +~~~~~~~~~~~~~~~~~~~~
>
>  Coresight tracers are represented using the Perf framework's Performance
>  Monitoring Unit (PMU) abstraction.  As such the perf framework takes charge of
> @@ -495,7 +497,11 @@ More information on the above and other example on how to use Coresight with
>  the perf tools can be found in the "HOWTO.md" file of the openCSD gitHub
>  repository [#third]_.
>
> -2.1) AutoFDO analysis using the perf tools:
> +Advanced perf framework usage
> +-----------------------------
> +
> +AutoFDO analysis using the perf tools
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>  perf can be used to record and analyze trace of programs.
>
> @@ -513,7 +519,8 @@ The --itrace option controls the type and frequency of synthesized events
>  Note that only 64-bit programs are currently supported - further work is
>  required to support instruction decode of 32-bit Arm programs.
>
> -2.2) Tracing PID
> +Tracing PID
> +~~~~~~~~~~~
>
>  The kernel can be built to write the PID value into the PE ContextID registers.
>  For a kernel running at EL1, the PID is stored in CONTEXTIDR_EL1.  A PE may
> @@ -547,7 +554,7 @@ wants to trace PIDs for both host and guest, the two configs "contextid1" and
>
>
>  Generating coverage files for Feedback Directed Optimization: AutoFDO
> ----------------------------------------------------------------------
> +~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
>  'perf inject' accepts the --itrace option in which case tracing data is
>  removed and replaced with the synthesized events. e.g.
> --
> 2.28.0
>


-- 
Mike Leach
Principal Engineer, ARM Ltd.
Manchester Design Centre. UK