On Fri, Nov 08, 2013 at 11:36:58PM +0100, Frederic Weisbecker wrote: > [ 237.627769] perf samples too long (3397569 > 2500), lowering > kernel.perf_event_max_sample_rate to 50000 > [ 237.637124] INFO: NMI handler (perf_event_nmi_handler) took too long to > run: 444.233 msecs > > 444 msecs is huge.
Be glad your system lived to tell about it ;-) Calling printk() from NMI context is Russian roulette; I'm still waiting for the first report it actually locked up :-) That said, I'm not sure what kernel you're running, but there were some issues with time-keeping hereabouts, but more importantly that second timing includes the printk() call of the first -- so that's always going to be fucked. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
