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| author |   Andi Kleen <andi@firstfloor.org> | 2020-10-13 20:53:46 -0700 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2020-10-14 13:14:40 -0300 |
| commit | 6556a75becb51afa8f9233186d437e9b6eb6f4b5 (patch) | |
| tree | 42601c6dd42cabdc7df8725d31a44214c3cf164f /tools/perf | |
| parent | perf tools: Add support for exclusive groups/events (diff) | |
| download | wireguard-linux-6556a75becb51afa8f9233186d437e9b6eb6f4b5.tar.xz wireguard-linux-6556a75becb51afa8f9233186d437e9b6eb6f4b5.zip | |
perf intel-pt: Improve PT documentation slightly
Document the higher level --insn-trace etc. perf script options.
Include the howto how to build xed into the manpage
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: http://lore.kernel.org/lkml/20201014035346.4772-1-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf')
| -rw-r--r-- | tools/perf/Documentation/perf-intel-pt.txt | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/tools/perf/Documentation/perf-intel-pt.txt b/tools/perf/Documentation/perf-intel-pt.txt index cb637e0d0743..cd362dc2af07 100644 --- a/tools/perf/Documentation/perf-intel-pt.txt +++ b/tools/perf/Documentation/perf-intel-pt.txt @@ -112,6 +112,32 @@ The flags are "bcrosyiABEx" which stand for branch, call, return, conditional, system, asynchronous, interrupt, transaction abort, trace begin, trace end, and in transaction, respectively. +perf script also supports higher level ways to dump instruction traces: + + perf script --insn-trace --xed + +Dump all instructions. This requires installing the xed tool (see XED below) +Dumping all instructions in a long trace can be fairly slow. It is usually better +to start with higher level decoding, like + + perf script --call-trace + +or + + perf script --call-ret-trace + +and then select a time range of interest. The time range can then be examined +in detail with + + perf script --time starttime,stoptime --insn-trace --xed + +While examining the trace it's also useful to filter on specific CPUs using +the -C option + + perf script --time starttime,stoptime --insn-trace --xed -C 1 + +Dump all instructions in time range on CPU 1. + Another interesting field that is not printed by default is 'ipc' which can be displayed as follows: @@ -1110,6 +1136,10 @@ To display PEBS events from the Intel PT trace, use the itrace 'o' option e.g. perf script --itrace=oe +XED +--- + +include::build-xed.txt[] SEE ALSO -------- |