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5ef506130c
Add --branch-history option, to act the same as that option does for
perf report.
Example:
$ cat tcallf.c
volatile a = 10000, b = 100000, c;
__attribute__((noinline)) f2()
{
c = a / b;
}
__attribute__((noinline)) f1()
{
f2();
f2();
}
main()
{
while (1)
f1();
}
$ gcc -w -g -o tcallf tcallf.c
$ ./tcallf &
[1] 29409
$ perf top -e cycles:u -t $(pidof tcallf) --stdio --no-children --branch-history
PerfTop: 3819 irqs/sec kernel: 0.0% exact: 0.0% lost: 0/0 drop: 0/0 [4000Hz cycles:u], (target_tid: 29409)
--------------------------------------------------------------------------------------------------------------------
49.01% tcallf.c:5 [.] f2 tcallf
|
|--24.91%--f2 tcallf.c:4
| |
| |--17.14%--f1 tcallf.c:11 (cycles:1)
| | f1 tcallf.c:11
| | f2 tcallf.c:6 (cycles:3)
| | f2 tcallf.c:4
| | f1 tcallf.c:10 (cycles:2)
| | f1 tcallf.c:9
| | main tcallf.c:16 (cycles:1)
| | main tcallf.c:16
| | main tcallf.c:16 (cycles:1)
| | main tcallf.c:16
| | f1 tcallf.c:12 (cycles:1)
| | f1 tcallf.c:12
| | f2 tcallf.c:6 (cycles:3)
| | f2 tcallf.c:4
| | f1 tcallf.c:11 (cycles:1 iter:1 avg_cycles:12)
| | f1 tcallf.c:11
| | f2 tcallf.c:6 (cycles:3 iter:1 avg_cycles:12)
| | f2 tcallf.c:4
| | f1 tcallf.c:10 (cycles:2 iter:1 avg_cycles:12)
| |
| --7.78%--f1 tcallf.c:10 (cycles:2)
| f1 tcallf.c:9
| main tcallf.c:16 (cycles:1)
| main tcallf.c:16
| main tcallf.c:16 (cycles:1)
| main tcallf.c:16
| f1 tcallf.c:12 (cycles:1)
| f1 tcallf.c:12
| f2 tcallf.c:6 (cycles:3)
| f2 tcallf.c:4
| f1 tcallf.c:11 (cycles:1)
| f1 tcallf.c:11
| f2 tcallf.c:6 (cycles:3)
| f2 tcallf.c:4
| f1 tcallf.c:10 (cycles:2 iter:1 avg_cycles:12)
| f1 tcallf.c:9
| main tcallf.c:16 (cycles:1 iter:1 avg_cycles:12)
| main tcallf.c:16
| main tcallf.c:16 (cycles:1 iter:1 avg_cycles:12)
...
$ pkill tcallf
[1]+ Terminated ./tcallf
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lore.kernel.org/r/20230330131833.12864-2-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.