Re: [PATCH 04/14] perf/x86: output side-band events overhead

[Peter Zijlstra]

On Wed, Nov 23, 2016 at 04:44:42AM -0500, kan.liang@xxxxxxxxx wrote:
> From: Kan Liang <kan.liang@xxxxxxxxx>
> 
> Iterating all events which need to receive side-band events also bring
> some overhead.
> Save the overhead information in task context or CPU context, whichever
> context is available.
> 
> Signed-off-by: Kan Liang <kan.liang@xxxxxxxxx>
> ---
>  include/linux/perf_event.h      |  2 ++
>  include/uapi/linux/perf_event.h |  1 +
>  kernel/events/core.c            | 32 ++++++++++++++++++++++++++++----
>  3 files changed, 31 insertions(+), 4 deletions(-)

Guess?