[PATCH V2 0/2] perf/x86: Add ability to sample TSC

[Adrian Hunter <adrian.hunter@intel.com>]

Hi

TSC is needed to synchronize Intel Processor Trace (Intel PT)
with perf event samples. Refer to patch 1 for more details.

There is a description of Intel PT in the Intel Architecture
manuals:

http://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html 

With the advent of switching perf_clock to CLOCK_MONOTONIC,
it will not be possible to convert perf_clock directly to/from
TSC. So add the ability to sample TSC instead.

Changes in V2:
    perf: Sample additional clock value
        Rename "Architecture specific clock" to
        "Processor trace clock" 
        Rename PERF_SAMPLE_CLOCK_ARCH -> PERF_SAMPLE_CLOCK_PT etc
        Expand commit message

    perf/x86: Provide TSC for PERF_SAMPLE_CLOCK_PT
        Rename PERF_SAMPLE_CLOCK_ARCH -> PERF_SAMPLE_CLOCK_PT etc
        Expand commit message


Adrian Hunter (2):
      perf: Sample additional clock value
      perf/x86: Provide TSC for PERF_SAMPLE_CLOCK_PT

 arch/x86/include/asm/perf_event.h |  6 ++++++
 arch/x86/kernel/cpu/perf_event.c  | 10 ++++++++++
 include/linux/perf_event.h        |  3 ++-
 include/uapi/linux/perf_event.h   | 19 +++++++++++++++++--
 kernel/events/core.c              | 30 ++++++++++++++++++++++++++++++
 kernel/events/internal.h          |  4 ++++
 6 files changed, 69 insertions(+), 3 deletions(-)


Regards
Adrian