linux-kernel - Re: [PATCH v2 0/4] Perf tool: Enable Arm arch timer counter and arm-spe's timestamp

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Message-ID: <CANLsYkzR+DSrss0dzPjMPKW+4ZGMbD9V23PLDSZAJM1-SQU0CQ@mail.gmail.com>
Date:   Wed, 12 Aug 2020 10:06:53 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     Leo Yan <leo.yan@...aro.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>, Will Deacon <will@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Kemeng Shi <shikemeng@...wei.com>,
        "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Igor Lubashev <ilubashe@...mai.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Jin Yao <yao.jin@...ux.intel.com>,
        Stephane Eranian <eranian@...gle.com>,
        James Clark <james.clark@....com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] Perf tool: Enable Arm arch timer counter and
 arm-spe's timestamp

Hi Arnaldo,

On Fri, 7 Aug 2020 at 01:16, Leo Yan <leo.yan@...aro.org> wrote:
>
> This patch set is to enable Arm arch timer counter and Arm SPE is the
> first customer to use arch timer counter for its timestamp.
>
> Patches 01 ~ 03 enables Arm arch timer counter in Perf tool; patch 01 is
> to retrieve arch timer's parameters from mmaped page; patch 02 provides
> APIs for the conversion between arch timer's counter and time; patch 03
> adds a test for patches 01 and 02.
>
> As the first customer to use Arm arch timer counter in perf tool, patch
> 04 is to generate sample's timestamp for ARM SPE AUX trace data.
>
> This patch set has been rebased on perf/core branch with the latest
> commit c4735d990268 ("perf evsel: Don't set
> sample_regs_intr/sample_regs_user for dummy event").

The ARM SPE perf tools code is orphan and I don't have the cycles to
pick it up.  Leo has spent a lot of time in that code and as such I
suggest that he starts maintaining it, probably following the same
kind of arrangement you and I have for coresight.

Thanks,
Mathieu

>
> After changes:
>
>   # perf test 67 -v
>     67: Convert perf time to arch timer counter
>     --- start ---
>     test child forked, pid 5463
>     mmap size 528384B
>     1st event perf time 2231755083020 arch timer cnt 113097053477
>     test time           2231755087460 arch timer cnt 113097053699
>     2nd event perf time 2231755090680 arch timer cnt 113097053860
>     test child finished with 0
>     ---- end ----
>
>   Reports the SPE sample with timestamp:
>
>   $ perf script -F,+time
>     dd  6799 [034] 25496.733475:          1              l1d-access:      ffff87f37b88 _dl_start+0x288 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
>     dd  6799 [034] 25496.733475:          1              tlb-access:      ffff87f37b88 _dl_start+0x288 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
>     dd  6799 [034] 25496.733479:          1              l1d-access:      ffff87f37c74 _dl_start+0x374 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
>     dd  6799 [034] 25496.733479:          1              tlb-access:      ffff87f37c74 _dl_start+0x374 (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
>     dd  6799 [034] 25496.733485:          1              l1d-access:      ffff87f49af4 __GI___tunables_init+0x3c (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
>     dd  6799 [034] 25496.733485:          1              tlb-access:      ffff87f49af4 __GI___tunables_init+0x3c (/usr/lib/aarch64-linux-gnu/ld-2.28.so)
>
> Changes from v1:
> * Rebased on the latest perf/core branch;
> * Added a testing for Arm timer counter conversion (Ian Rogers).
>
>
> Leo Yan (4):
>   perf tools: Support Arm arch timer counter
>   perf arm_arch_timer: Convert between counter and timestamp
>   perf arm_arch_timer: Test conversion between counter and timestamp
>   perf arm-spe: Enable timestamp with arch timer counter
>
>  tools/perf/arch/arm64/include/arch-tests.h    |   6 +
>  tools/perf/arch/arm64/tests/Build             |   1 +
>  tools/perf/arch/arm64/tests/arch-tests.c      |   4 +
>  .../tests/perf-time-to-arch-timer-counter.c   | 189 ++++++++++++++++++
>  tools/perf/arch/arm64/util/Build              |   1 +
>  tools/perf/arch/arm64/util/arch_timer.c       |  50 +++++
>  tools/perf/arch/arm64/util/arm-spe.c          |  17 ++
>  tools/perf/util/Build                         |   1 +
>  tools/perf/util/arm-spe.c                     |  16 +-
>  tools/perf/util/arm-spe.h                     |   5 +
>  tools/perf/util/arm_arch_timer.c              |  28 +++
>  tools/perf/util/arm_arch_timer.h              |  23 +++
>  12 files changed, 339 insertions(+), 2 deletions(-)
>  create mode 100644 tools/perf/arch/arm64/tests/perf-time-to-arch-timer-counter.c
>  create mode 100644 tools/perf/arch/arm64/util/arch_timer.c
>  create mode 100644 tools/perf/util/arm_arch_timer.c
>  create mode 100644 tools/perf/util/arm_arch_timer.h
>
> --
> 2.17.1
>