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| author | Adrian Hunter <adrian.hunter@intel.com> | 2020-04-29 18:07:50 +0300 |
|---|---|---|
| committer | Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-05-05 16:35:30 -0300 |
| commit | 43358d9dfb250842383cddad816a7538548a5070 (patch) | |
| tree | 79bb30fba6f2f6a52f5668728dccbe2b057aad97 /tools/perf/Documentation/itrace.txt | |
| parent | f0a0251cee800bf90cff92ecfaf4a4d4c9c493b2 (diff) | |
| download | linux-stable-43358d9dfb250842383cddad816a7538548a5070.tar.gz linux-stable-43358d9dfb250842383cddad816a7538548a5070.tar.bz2 linux-stable-43358d9dfb250842383cddad816a7538548a5070.zip | |
perf intel-pt: Update documentation about itrace G and L options
Provide a little more information about the new G and L options,
particularly the issue with large PEBs.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Link: http://lore.kernel.org/lkml/20200429150751.12570-9-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/Documentation/itrace.txt')
| -rw-r--r-- | tools/perf/Documentation/itrace.txt | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/tools/perf/Documentation/itrace.txt b/tools/perf/Documentation/itrace.txt index 0326050beebd..271484754fee 100644 --- a/tools/perf/Documentation/itrace.txt +++ b/tools/perf/Documentation/itrace.txt @@ -33,6 +33,10 @@ Also the number of last branch entries (default 64, max. 1024) for instructions or transactions events can be specified. + Similar to options g and l, size may also be specified for options G and L. + On x86, note that G and L work poorly when data has been recorded with + large PEBS. Refer linkperf:perf-intel-pt[1] man page for details. + It is also possible to skip events generated (instructions, branches, transactions, ptwrite, power) at the beginning. This is useful to ignore initialization code. |