perf/core: Fix endless multiplex timer
Kan and Andi reported that we fail to kill rotation when the flexible events go empty, but the context does not. XXX moar Fixes: fd7d5517 ("perf/cgroups: Don't rotate events for cgroups unnecessarily") Reported-by:Andi Kleen <ak@linux.intel.com> Reported-by:
Kan Liang <kan.liang@linux.intel.com> Tested-by:
Kan Liang <kan.liang@linux.intel.com> Signed-off-by:
Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20200305123851.GX2596@hirez.programming.kicks-ass.net
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