Re: [PATCH] perf: remove sw events from multiplexing rotation list

[Peter Zijlstra]

On Thu, 2012-09-06 at 15:23 +0200, Stephane Eranian wrote:
> Software events (sw,tracepoints,...) do not need to be
> multiplexed. However, when using a SW event, the SW PMU
> (TYPE_SOFTWARE, TYPE_TRACEPOINT) was added to the per-cpu
> rotation_list. That list is used by perf_rotate_context()
> to iterate over all the PMUs to rotate event lists and
> multiplex.
> 
> This is not needed for SW events. Doing this adds some
> unnecessary overhead, so drop it by rejecting SW PMUs
> in perf_pmu_rotate_start().

Thanks!
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/