[PATCH v4 0/8] perf cs_etm: Basic support for virtual/kernel timestamps

From: James Clark
Date: Thu Jan 19 2023 - 10:46:01 EST


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@xxxxxxxxxx/
[2]: https://lore.kernel.org/all/20220503123537.1003035-1-german.gomez@xxxxxxx/

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/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 +-
11 files changed, 349 insertions(+), 195 deletions(-)


base-commit: 69b41ac87e4a664de78a395ff97166f0b2943210
prerequisite-patch-id: 9722bf86e3e6d16d177ff9a1411992a795a7dcbd
prerequisite-patch-id: b05dbef439c2ea8465f3321532257b0ca29f21f9
prerequisite-patch-id: 92680a4781cbcf010fcb007e6ea030f59e9eaefc
prerequisite-patch-id: 8e3a73a04e4b89b503377b5fac1d89d551159393
prerequisite-patch-id: 09980d8fedcdaa70b220a7802428109f48448a58
prerequisite-patch-id: 711843c93d5d6bdf4d73e024949950f4e4de9e1a
--
2.25.1