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b511b54d21
Add comprehensive support for gperftools CPU profiler to enable performance
profiling of Falco. This commit introduces:
- New CMake options:
* USE_GPERFTOOLS: Enable gperftools CPU profiler support (default: OFF)
* USE_FRAME_POINTER: Enable frame pointers for accurate profiling (default: OFF)
- Automatic frame pointer enabling: When USE_GPERFTOOLS is enabled, frame
pointers are automatically enabled to ensure accurate stack traces in
profiling output.
- Support for both system and bundled gperftools:
* System gperftools: Automatically detected via find_path/find_library
* Bundled gperftools: Built from source (version 2.15) when
USE_BUNDLED_GPERFTOOLS is enabled
- Enhanced stack trace support: Automatically detects and enables libunwind
when available for better stack traces, falling back to frame pointers
otherwise.
- Proper library linking: Uses --whole-archive linker flags to ensure
profiler initialization code is linked even when ProfilerStart() is not
called directly, enabling CPUPROFILE environment variable support.
- Compile-time detection: Adds HAS_GPERFTOOLS preprocessor definition
for conditional compilation.
The profiler can be activated at runtime by setting the CPUPROFILE
environment variable to a file path where profiling data should be written.
Usage:
cmake -DUSE_GPERFTOOLS=ON ..
make
CPUPROFILE=/tmp/falco.prof ./falco
Signed-off-by: irozzo-1A <iacopo@sysdig.com>