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authorAndi Kleen <andi@firstfloor.org>2020-10-14 05:53:46 +0200
committerArnaldo Carvalho de Melo <acme@redhat.com>2020-10-14 18:14:40 +0200
commit6556a75becb51afa8f9233186d437e9b6eb6f4b5 (patch)
tree42601c6dd42cabdc7df8725d31a44214c3cf164f /tools/perf
parentperf tools: Add support for exclusive groups/events (diff)
downloadlinux-6556a75becb51afa8f9233186d437e9b6eb6f4b5.tar.xz
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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.txt30
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
--------