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| author |   Adrian Hunter <adrian.hunter@intel.com> | 2022-05-09 18:24:00 +0300 |
|---|---|---|
| committer |   Arnaldo Carvalho de Melo <acme@redhat.com> | 2022-05-17 11:56:15 -0300 |
| commit | 75659c6fb5afdbcdbcac9a852031e20377b51a7a (patch) | |
| tree | 265da4ea3c0eec09f81ad2a3332c5135825d1d2b /tools/perf/scripts | |
| parent | perf script: Print Intel ptwrite value as a string if it is ASCII (diff) | |
| download | linux-dev-75659c6fb5afdbcdbcac9a852031e20377b51a7a.tar.xz linux-dev-75659c6fb5afdbcdbcac9a852031e20377b51a7a.zip | |
perf scripts python: intel-pt-events.py: Print ptwrite value as a string if it is ASCII
It can be convenient to put a string value into a ptwrite payload as
a quick and easy way to identify what is being printed.
To make that useful, if the Intel ptwrite payload value contains only
printable ASCII characters padded with NULLs, then print it also as a
string.
Using the example program from the "Emulated PTWRITE" section of
tools/perf/Documentation/perf-intel-pt.txt:
$ echo -n "Hello" | od -t x8
0000000 0000006f6c6c6548
0000005
$ perf record -e intel_pt//u ./eg_ptw 0x0000006f6c6c6548
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.016 MB perf.data ]
$ perf script --itrace=ew intel-pt-events.py
Intel PT Branch Trace, Power Events, Event Trace and PTWRITE
Switch In 38524/38524 [001] 24166.044995916 0/0
eg_ptw 38524/38524 [001] 24166.045380004 ptwrite jmp IP: 0 payload: 0x6f6c6c6548 Hello 56532c7ce196 perf_emulate_ptwrite+0x16 (/home/ahunter/git/work/eg_ptw)
End
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Link: https://lore.kernel.org/r/20220509152400.376613-4-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Diffstat (limited to 'tools/perf/scripts')
| -rw-r--r-- | tools/perf/scripts/python/intel-pt-events.py | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/tools/perf/scripts/python/intel-pt-events.py b/tools/perf/scripts/python/intel-pt-events.py index 973bd12b7b40..9b7746b89381 100644 --- a/tools/perf/scripts/python/intel-pt-events.py +++ b/tools/perf/scripts/python/intel-pt-events.py @@ -104,7 +104,13 @@ def print_ptwrite(raw_buf): flags = data[0] payload = data[1] exact_ip = flags & 1 - print("IP: %u payload: %#x" % (exact_ip, payload), end=' ') + try: + s = payload.to_bytes(8, "little").decode("ascii").rstrip("\x00") + if not s.isprintable(): + s = "" + except: + s = "" + print("IP: %u payload: %#x" % (exact_ip, payload), s, end=' ') def print_cbr(raw_buf): data = struct.unpack_from("<BBBBII", raw_buf) |