On Wed, 16 Jan 2019 09:00:00 +0100 Claudio <claudio.font...@gliwa.com> wrote:
> Indeed the perf event interface would be awesome, if only it would support > tracing all processes. > > Unfortunately for my use case, it can only trace one process on any cpus, or > all processes on one (1) cpu. > > I guess for some kind of security concerns.. Not security, but performance. Serialized writes are best done on serialized instances (per cpu or a single task). Having all tasks on all CPUs write to a single location is a huge detriment to performance, and has a significant impact. Which is why the buffer you are asking for doesn't exist. -- Steve > > I'll take a look at how much work it would be to extend the interface for the > any process/any cpu use case. > > Ciao and thank you, > > Claudio > >
