On 2016.04.02 at 13:00 +0200, Peter Zijlstra wrote: > On Sat, Apr 02, 2016 at 11:32:39AM +0200, Markus Trippelsdorf wrote: > > Current git kernel sometimes shows: > > > > perf: interrupt took too long (71 > 52), lowering > > kernel.perf_event_max_sample_rate to 300 > > perf: interrupt took too long (103 > 88), lowering > > kernel.perf_event_max_sample_rate to 300 > > perf: interrupt took too long (130 > 128), lowering > > kernel.perf_event_max_sample_rate to 300 > > perf: interrupt took too long (175 > 162), lowering > > kernel.perf_event_max_sample_rate to 300 > > perf: interrupt took too long (219 > 218), lowering > > kernel.perf_event_max_sample_rate to 300 > > ... > > > > when running e.g. "perf top" even when > > /proc/sys/kernel/perf_cpu_time_max_percent is set to 0. > > > Ah, was 0 also meant to disable it? > > Does the below help?
Yes, it obviously fixes the issue. -- Markus
