Implement a flamegraph widget that recursively walks down a tree
splitting line segments based on their value (summed up periods across
call chains). A visitor pattern is used so that the same logic can
both draw the line segments and locate which segment had a mouse
click.
Add a tab for the flame graph widget.
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Co-developed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Alice Rogers <alice.mei.rogers@gmail.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
A textual app that displays the results of processing samples similar
to perf report. The app displays a tree of first processes and then
functions which drop down to show more detail on the functions they
call. The functions with the largest number of samples are sorted
first, after each function the percentage of time spent within it is
highlighted. If more than one event is recorded then each event
appears first, with the processes and functions sorted for that event
beneath it.
The app is written in python and requires the textual framework. Using
the textual framework means that in most modern terminals the mouse is
supported, the color scheme can be configured, and screenshots made.
With perf report:
```
$ perf record -e cycles:u -g perf test -w brstack
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.008 MB perf.data (57 samples) ]
$ perf report
...
Samples: 57 of event 'cycles:u', Event count (approx.): 15907831
Children Self Command Shared Object Symbol
- 88.86% 0.00% perf libc.so.6 [.] 0x000079b17df69ca8
0x79b17df69ca8
main
handle_internal_command
cmd_test
- brstack
- 84.27% brstack_bench
- 40.69% brstack_foo
brstack_bar
3.32% brstack_bar
3.31% brstack_bar
1.27% brstack_foo
+ 88.86% 0.00% perf perf [.] main
+ 88.86% 0.00% perf perf [.] handle_internal_command
+ 88.86% 0.00% perf perf [.] cmd_test
+ 88.86% 0.00% perf perf [.] brstack
+ 84.27% 40.26% perf perf [.] brstack_bench
+ 41.96% 30.71% perf perf [.] brstack_foo
+ 17.89% 17.89% perf perf [.] brstack_bar
```
With the treport script:
```
$ perf record -e cycles:u -g perf test -w brstack
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.008 MB perf.data (57 samples) ]
$ tools/perf/python/treport.py
O ReportApp
Report
╸━━━━━━╺━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
▼ Profile
└── ▼ cycles:u 100%
└── ▼ perf (32963) 100%
├── ▼ /usr/lib/x86_64-linux-gnu/libc.so.6 0x79b17df6
│ └── ▼ main 56.1%
│ └── ▼ handle_internal_command 56.1%
│ └── ▼ cmd_test 56.1%
│ └── ▼ brstack 56.1% ▁▁
│ ├── ▼ brstack_bench 52.6%
│ │ ├── ▶ brstack_foo 24.6%
│ │ └── brstack_bar 1.75%
│ ├── brstack_foo 1.75%
│ └── brstack_bar 1.75%
├── ▶ /usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2
▌
^q Quit ▏^p palette
```
Committer testing:
One needs to install 'python-textual' to have this working.
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Co-developed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Signed-off-by: Alice Rogers <alice.mei.rogers@gmail.com>
Link: https://lore.kernel.org/r/20260809051820.2436530-2-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
