From 6556a75becb51afa8f9233186d437e9b6eb6f4b5 Mon Sep 17 00:00:00 2001 From: Andi Kleen Date: Tue, 13 Oct 2020 20:53:46 -0700 Subject: 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 Cc: Adrian Hunter Cc: Jiri Olsa Link: http://lore.kernel.org/lkml/20201014035346.4772-1-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-intel-pt.txt | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) 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 -------- -- cgit v1.2.3-59-g8ed1b