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| author | Namhyung Kim <namhyung@kernel.org> | 2025-11-20 15:48:00 -0800 |
|---|---|---|
| committer | Namhyung Kim <namhyung@kernel.org> | 2025-12-02 16:13:32 -0800 |
| commit | f4e3381648be205365cb475512ee536e108e060e (patch) | |
| tree | 3e9c7eede37183b3d5d392426ffe959733a2b4f6 /tools/lib/python/kdoc/python_version.py | |
| parent | 22b0ceee1c48178ed3a69a17ea36150ab1f1eb9a (diff) | |
perf tools: Minimal DEFERRED_CALLCHAIN support
Add a new event type for deferred callchains and a new callback for the
struct perf_tool. For now it doesn't actually handle the deferred
callchains but it just marks the sample if it has the PERF_CONTEXT_
USER_DEFFERED in the callchain array.
At least, perf report can dump the raw data with this change. Actually
this requires the next commit to enable attr.defer_callchain, but if you
already have a data file, it'll show the following result.
$ perf report -D
...
0x2158@perf.data [0x40]: event: 22
.
. ... raw event: size 64 bytes
. 0000: 16 00 00 00 02 00 40 00 06 00 00 00 0b 00 00 00 ......@.........
. 0010: 03 00 00 00 00 00 00 00 a7 7f 33 fe 18 7f 00 00 ..........3.....
. 0020: 0f 0e 33 fe 18 7f 00 00 48 14 33 fe 18 7f 00 00 ..3.....H.3.....
. 0030: 08 09 00 00 08 09 00 00 e6 7a e7 35 1c 00 00 00 .........z.5....
121163447014 0x2158 [0x40]: PERF_RECORD_CALLCHAIN_DEFERRED(IP, 0x2): 2312/2312: 0xb00000006
... FP chain: nr:3
..... 0: 00007f18fe337fa7
..... 1: 00007f18fe330e0f
..... 2: 00007f18fe331448
: unhandled!
Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Diffstat (limited to 'tools/lib/python/kdoc/python_version.py')
0 files changed, 0 insertions, 0 deletions