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    Subject[PATCH v2 0/7] perf arm-spe: Enable timestamp
    Date
    As we know, the timestamp is important for AUX trace; it's mainly used
    to correlate between perf events and AUX trace, allows to generate
    events with time ordered manner. There have several good examples of
    enabling timestamp for AUX trace (like Intel-pt, Intel-bts, etc).

    Since the conversion between TSC and kernel timestamp has been supported
    on Arm64, TSC is a naming convention from x86, but perf now has reused
    it to support Arm arch timer counter.

    This patch set is to enable timestamp for Arm SPE trace. It reads out
    TSC parameters from mmap page and stores into auxtrace info structure;
    the TSC parameters are used for conversion between timer counter and
    kernel time and which is applied for Arm SPE samples.

    This patch set can be clearly applied on perf/core branch with:

    commit 6859bc0e78c6 ("perf stat: Improve readability of shadow stats")

    Ths patch series has been tested on Hisilicon D06 platform.

    After:

    # perf script -F comm,time,cpu,pid,dso,ip,sym

    perf 2408 [032] 168.680297: ffffbd1253690a3c perf_event_exec ([kernel.kallsyms])
    perf 2408 [032] 168.680297: ffffbd1253690a3c perf_event_exec ([kernel.kallsyms])
    false_sharing.e 2408 [032] 168.680317: ffffbd1253683f50 perf_iterate_ctx.constprop.0 ([kernel.kallsyms])
    false_sharing.e 2408 [032] 168.680317: ffffbd1253683f50 perf_iterate_ctx.constprop.0 ([kernel.kallsyms])
    false_sharing.e 2408 [032] 168.680319: ffffbd1253683f70 perf_iterate_ctx.constprop.0 ([kernel.kallsyms])
    false_sharing.e 2408 [032] 168.680319: ffffbd1253683f70 perf_iterate_ctx.constprop.0 ([kernel.kallsyms])
    false_sharing.e 2408 [032] 168.680367: ffffbd12539b03ec __arch_clear_user ([kernel.kallsyms])
    false_sharing.e 2408 [032] 168.680375: ffffbd1253721440 kmem_cache_alloc ([kernel.kallsyms])
    false_sharing.e 2408 [032] 168.680375: ffffbd1253721440 kmem_cache_alloc ([kernel.kallsyms])
    false_sharing.e 2408 [032] 168.680375: ffffbd1253721440 kmem_cache_alloc ([kernel.kallsyms])
    false_sharing.e 2408 [032] 168.680375: ffffbd1253721440 kmem_cache_alloc ([kernel.kallsyms])
    false_sharing.e 2408 [032] 168.680376: ffffbd1253683f70 perf_iterate_ctx.constprop.0 ([kernel.kallsyms])
    false_sharing.e 2408 [032] 168.680376: ffffbd1253683f70 perf_iterate_ctx.constprop.0 ([kernel.kallsyms])
    false_sharing.e 2408 [032] 168.680376: ffffbd1253683f70 perf_iterate_ctx.constprop.0 ([kernel.kallsyms])

    Changes from v1:
    * Rebased patch series on the latest perf/core branch;
    * Fixed the patch for dumping TSC parameters to support both the
    older and new auxtrace info format.


    Leo Yan (7):
    perf arm-spe: Remove unused enum value ARM_SPE_PER_CPU_MMAPS
    perf arm-spe: Store TSC parameters in auxtrace info
    perf arm-spe: Dump TSC parameters
    perf arm-spe: Convert event kernel time to counter value
    perf arm-spe: Assign kernel time to synthesized event
    perf arm-spe: Bail out if the trace is later than perf event
    perf arm-spe: Don't wait for PERF_RECORD_EXIT event

    tools/perf/arch/arm64/util/arm-spe.c | 23 +++++++
    tools/perf/util/arm-spe.c | 89 +++++++++++++++++++++++-----
    tools/perf/util/arm-spe.h | 7 ++-
    3 files changed, 103 insertions(+), 16 deletions(-)

    --
    2.25.1

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