On Wed, Aug 05, 2015 at 03:53:17PM +0200, Peter Zijlstra wrote:
> +/*
> + * NMI-safe method to read a local event, that is an event that
> + * is:
> + * - either for the current task, or for this CPU
> + * - does not have inherit set, for inherited task events
> + * will not be local and we cannot read them atomically
> + * - must not have a pmu::count method
> + */
> +u64 perf_event_read_local(struct perf_event *event)
> +{
> + unsigned long flags;
> + u64 val;
> +
> + /*
> + * Disabling interrupts avoids all counter scheduling (context
> + * switches, timer based rotation and IPIs).
> + */
> + local_irq_safe(flags);
Hmm, I think local_irq_save(flags) will compile much better. Obviously
this patch hasn't seen a compiler up close.
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