It's need to run systemtap util for loading kernel module. This kernel module capture context switch timestamp and systemtap store it in the temp file.
Before running profiling application you should run systemtap script with root privileges as following:
\# stap -o /tmp/cs_profiling_info.log scripts/context_switch_logger.stp name APPLICATION_NAME
where APPLICATION_NAME is profiling application
(profiler_gui) Moving sources into separate files;
(profiler_gui) Rename Prof* classes into Easy*;
(EasyGraphicsView) Optimized performance by not painting items which were not expanded in TreeWidget. While there are no range selected for TreeWidget, only top-level blocks are painted on scene.
(profiler GUI) Lightening profiler::colors to be more bright;
(ProfTreeWidget) Displaying per frame and per thread statistics;
(ProfGraphicsView) Draw chronometer item text in Difference mode to be more readable.
(profiler GUI) Added plain vector of ProfBlocks (additional information for gui) for fast access;
(ProfGraphicsView) Removed unnecessary methods; small refactoring;
(ProfTreeWidget) Removed unnecessary map of tree items;
(ProfGraphicsScrollbar) Added colorizing of minimap (green = low duration, red = long duration);
(profiler Reader) Added self_duration field for statistics;
(profiler Reader) Removed #ifdef macros;
(profiler Reader) moved BlocksTree, BlocksTreeRoot and thread_blocks_tree_t types inside profiler namespace;
(profiler GUI) Added globals.h and globals.cpp containing global variables and signals; Added profiler_gui namespace;
(ProfTreeWidget) Added context menu "Select columns" to make it possible to hide columns;
(ProfTreeWidget) Added percent statistics for blocks (Self %, Parent % and Frame %); Added displaying of total thread duration;
(ProfGraphicsScrollbar) Added context menu to make it possible to choose which thread to display on minimap;
(ProfGraphicsView) Highlighting currently selected thread;
(profiler Optimizations) removed unnecessary profiler::Block creation from profiler::setThreadName();
(profiler Optimizations) removed statics from getCurrentTime() function - more correct static usage.
* (Graphics view) Changed height of blocks. Variable thread-block height;
* (Tree widget) Disabled sorting by name to save order of threads displayed on graphics view;
* (Profiler reader) Changed type of value returned by fillTreesFromFile().
