perf_control.hpp

Control perf recording dynamically during program execution.

This header-only library provides a simple interface to enable or disable perf event recording at specific points in the code, allowing for targeted performance analysis.

Usage

PerfControl pc({"perf", "record"});
pc.enable();
// do something
pc.disable();

Example

Consider the following example:

perf_control.hpp/example.cpp

Lines 7 to 12 in eb99420

	PerfControl perf({"perf", "record"});
	foo();
	perf.enable();
	bar(); // Only record this
	perf.disable();
	foo();

$ g++ example.cpp -o example

$ ./example
Events disabled
Events enabled
Events disabled
[ perf record: Woken up 4 times to write data ]
[ perf record: Captured and wrote 0.057 MB perf.data (939 samples) ]

$ perf report
# Overhead  Command  Shared Object     Symbol                                        
# ........  .......  ................  ..............................................
#
    96.48%  example  example           [.] bar

The function foo() is not recorded by perf, while bar() is captured.