On 04/09/2019 14:13, Peter Zijlstra wrote: > On Tue, Sep 03, 2019 at 05:43:40PM +0200, Radim Krčmář wrote: > >> Red Hat adapted one of them for the tracepoint framework and created a >> tool to plot a heatmap of nr_running, where the sched_update_nr_running >> tracepoint is being used for fine grained monitoring of scheduling >> imbalance. > > You should be able to reconstruct this from wakeup and switch > tracepoints. > >
I never tried to do it myself but know some folks around me gave it a go (Morten, Qais and maybe even Chris). I can't remember the exact details but there was something about not getting the right input - duplicated wakeups, or no migration information (I think sched_migrate doesn't cover all of the cases) so the information you're building diverges as time progresses.
