On Wed, Nov 23, 2016 at 04:44:40AM -0500, [email protected] wrote: > From: Kan Liang <[email protected]> > > NMI handler is one of the most important part which brings overhead. > > There are lots of NMI during sampling. It's very expensive to log each > NMI. So the accumulated time and NMI# will be output when event is going > to be disabled or task is scheduling out. > The newly introduced flag PERF_EF_LOG indicate to output the overhead > log. > > Signed-off-by: Kan Liang <[email protected]> > --- > arch/x86/events/core.c | 19 ++++++++++++++- > arch/x86/events/perf_event.h | 2 ++ > include/linux/perf_event.h | 1 + > include/uapi/linux/perf_event.h | 2 ++ > kernel/events/core.c | 54 > ++++++++++++++++++++++------------------- > 5 files changed, 52 insertions(+), 26 deletions(-)
The subject says this patch is x86 specific, but most changes are in core code.
