On Tue, 9 Jan 2018 19:02:07 +0100 Peter Zijlstra <[email protected]> wrote:
> This would globally serialize all perf_ioctl()'s, also that event_mutex > is for trace_events and really does not belong in perf. > > So no, I really rather would not do this. > > The alternative I was thinking of was lifting the cpuhp lock out from > under event_mutex, that would also break the chain, but would probably > be lots of work for trace bits. I think we tried that once, and it became an never ending whack a mole process. I prefer not to do that either. How bad is your work around patch that you posted? -- Steve
