linux-kernel - Re: [PATCH v5 0/8] perf cs_etm: Basic support for virtual/kernel timestamps

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Date:   Fri, 20 Jan 2023 14:42:24 +0000
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     James Clark <james.clark@....com>,
        linux-perf-users@...r.kernel.org, tanmay@...vell.com,
        leo.yan@...aro.org, mike.leach@...aro.org
Cc:     sgoutham@...vell.com, gcherian@...vell.com, lcherian@...vell.com,
        bbhushan2@...vell.com,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        John Garry <john.g.garry@...cle.com>,
        Will Deacon <will@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>, coresight@...ts.linaro.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 0/8] perf cs_etm: Basic support for virtual/kernel
 timestamps

On 20/01/2023 14:36, James Clark wrote:
> Changes since v4:
> 
>    * Rebase onto perf/core
>    * Convert new perf_pmu__cpu_slots_per_cycle() function to use
>      new helper functions
>    
> ===========================
> Changes since v3:
> 
>    * Scale time estimates by INSTR_PER_NS, rather than assuming 1
>      instruction = 1ns
>    * Add a new commit that fixes some issues around timestamps going
>      backwards
>    * Use nanoseconds inside cs-etm-decoder.c, rather than storing the
>      raw time values and converting when a sample is synthesized. This
>      simplifies some of the code like estimating the first timestamp.
>    
> ===========================
> Changes since v2:
> 
>    * Remove const to non-const change and copy strings where needed
>      instead.
>    * Use sizeof() instead of PATH_MAX
>    * Append "will not be set accurately." to new error message
>    * Remove unneeded stat() call
>    * Rebase on perf/core
>    
> ==========================
> 
> Changes since v1:
> 
>    * Add 3 refactor commits for sysfs reading around pmu.c as suggested
>      by Arnaldo here [1]
>    * The dependency on [2] has now reached mainline so is no longer
>      blocking
>    * Rebase on perf/core
>    
> [1]: https://lore.kernel.org/all/YnqVqq5QW%2Fb14oPZ@kernel.org/
> [2]: https://lore.kernel.org/all/20220503123537.1003035-1-german.gomez@arm.com/
> 
> German Gomez (4):
>    perf pmu: Add function to check if a pmu file exists
>    perf cs_etm: Keep separate symbols for ETMv4 and ETE parameters
>    perf cs_etm: Record ts_source in AUXTRACE_INFO for ETMv4 and ETE
>    perf cs_etm: Set the time field in the synthetic samples
> 
> James Clark (4):
>    perf: Remove duplication around EVENT_SOURCE_DEVICE_PATH
>    perf: Use perf_pmu__open_file() and perf_pmu__scan_file()
>    perf: Remove remaining duplication of bus/event_source/devices/...
>    perf: cs-etm: Ensure that Coresight timestamps don't go backwards
> 
>   tools/perf/arch/arm/util/auxtrace.c           |   5 +-
>   tools/perf/arch/arm/util/cs-etm.c             |  91 ++++++++-
>   tools/perf/arch/arm64/util/pmu.c              |   4 +-
>   tools/perf/arch/x86/util/pmu.c                |  12 +-
>   tools/perf/util/cputopo.c                     |   9 +-
>   tools/perf/util/cs-etm-base.c                 |  34 +++-
>   .../perf/util/cs-etm-decoder/cs-etm-decoder.c |  68 +++++--
>   tools/perf/util/cs-etm.c                      |  95 +++++++++-
>   tools/perf/util/cs-etm.h                      |  16 +-
>   tools/perf/util/pmu-hybrid.c                  |  27 +--
>   tools/perf/util/pmu.c                         | 177 +++++++-----------
>   tools/perf/util/pmu.h                         |  10 +-
>   12 files changed, 351 insertions(+), 197 deletions(-)

For the series,

Acked-by: Suzuki K Poulose <suzuki.poulose@....com>


> 
> 
> base-commit: 1962ab6f6e0b39e4216206205bda14aff87705f3
> prerequisite-patch-id: 9722bf86e3e6d16d177ff9a1411992a795a7dcbd
> prerequisite-patch-id: b05dbef439c2ea8465f3321532257b0ca29f21f9
> prerequisite-patch-id: 92680a4781cbcf010fcb007e6ea030f59e9eaefc
> prerequisite-patch-id: 8e3a73a04e4b89b503377b5fac1d89d551159393
> prerequisite-patch-id: 09980d8fedcdaa70b220a7802428109f48448a58