alpha: Implement HW performance events on the EV67 and later CPUs.
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From: Peter Zijlstra on 4 May 2010 03:50 On Sat, 2010-05-01 at 11:55 +1200, Michael Cree wrote: > +/* I wonder what this is for ??? */ > +void set_perf_event_pending(void) > +{ > +} If the PMU Interrupt comes in as an NMI we cannot take locks and such from its handler. So what we do is queue that work to be ran later. The kernel has a fallback to run this stuff from the timer hardirq, but if the PMI is IRQ context (like ARM) you can simply call perf_event_do_pending() at its tail. Alternatively you can self-IPI like x86 does and run perf_event_do_pending() from there. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |