Messages in this thread | | | From | Adrian Hunter <> | Subject | [PATCH V2 0/2] perf/x86: Add ability to sample TSC | Date | Fri, 20 Feb 2015 14:44:07 +0200 |
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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
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