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

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commit 98dc19c114 upstream.

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: 7b2c862501 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Srivatsa S. Bhat (VMware)
2019-10-10 11:50:46 -07:00
committed by Chris
parent 92af40e987
commit 0b87cd11a5
1 changed files with 1 additions and 1 deletions
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2
kernel/trace/trace_hwlat.c
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@@ -151,7 +151,7 @@ void trace_hwlat_callback(bool enter)
if (enter)
nmi_ts_start = time_get();
else
nmi_total_ts = time_get() - nmi_ts_start;
nmi_total_ts += time_get() - nmi_ts_start;
}
if (enter)