tree b01c58de6fd199e0f72ccedf78f80e9ebc06e684
parent 7f8557b88d6aa5bf31f25f6013d81355a1b1d48d
author Srivatsa S. Bhat (VMware) <srivatsa@csail.mit.edu> 1570733446 -0700
committer Steven Rostedt (VMware) <rostedt@goodmis.org> 1570927773 -0400

tracing/hwlat: Report total time spent in all NMIs during the sample

nmi_total_ts is supposed to record the total time spent in *all* NMIs
that occur on the given CPU during the (active portion of the)
sampling window. However, the code seems to be overwriting this
variable for each NMI, thereby only recording the time spent in the
most recent NMI. Fix it by accumulating the duration instead.

Link: http://lkml.kernel.org/r/157073343544.17189.13911783866738671133.stgit@srivatsa-ubuntu

Fixes: 7b2c86250122 ("tracing: Add NMI tracing in hwlat detector")
Cc: stable@vger.kernel.org
Signed-off-by: Srivatsa S. Bhat (VMware) <srivatsa@csail.mit.edu>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>