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| author | Adrian Hunter <adrian.hunter@intel.com> | 2021-04-30 09:03:02 +0200 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2021-05-12 17:43:10 +0200 |
| commit | 83d7f5f1ad0ec6072bb5b4ca32795f0c199424e2 (patch) | |
| tree | fbbf353aed5ee090a809ef4cd70b3d35027da10a /tools/perf/Documentation/perf-inject.txt | |
| parent | perf inject: Add facility to do in place update (diff) | |
| download | linux-83d7f5f1ad0ec6072bb5b4ca32795f0c199424e2.tar.xz linux-83d7f5f1ad0ec6072bb5b4ca32795f0c199424e2.zip | |
perf inject: Add --vm-time-correlation option
Intel PT timestamps are affected by virtualization. Add a new option
that will allow the Intel PT decoder to correlate the timestamps and
translate the virtual machine timestamps to host timestamps.
The advantages of making this a separate step, rather than a part of
normal decoding are that it is simpler to implement, and it needs to
be done only once.
This patch adds only the option. Later patches add Intel PT support.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Reviewed-by: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: https://lore.kernel.org/r/20210430070309.17624-6-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/perf-inject.txt')
| -rw-r--r-- | tools/perf/Documentation/perf-inject.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-inject.txt b/tools/perf/Documentation/perf-inject.txt index a8eccff21281..91108fe3ad5f 100644 --- a/tools/perf/Documentation/perf-inject.txt +++ b/tools/perf/Documentation/perf-inject.txt @@ -68,6 +68,16 @@ include::itrace.txt[] --force:: Don't complain, do it. +--vm-time-correlation[=OPTIONS]:: + Some architectures may capture AUX area data which contains timestamps + affected by virtualization. This option will update those timestamps + in place, to correlate with host timestamps. The in-place update means + that an output file is not specified, and instead the input file is + modified. The options are architecture specific, except that they may + start with "dry-run" which will cause the file to be processed but + without updating it. Currently this option is supported only by + Intel PT, refer linkperf:perf-intel-pt[1] + SEE ALSO -------- linkperf:perf-record[1], linkperf:perf-report[1], linkperf:perf-archive[1], |