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authorKalesh Singh <kaleshsingh@google.com>2021-10-25 13:08:40 -0700
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2021-10-26 20:27:20 -0400
commit2d2f6d4b8ce738ef43fc3436b43cecd2fea64152 (patch)
treea2709fa4949c33b7b7a14894e5c3fda348594978 /Documentation/trace
parent722eddaa4043acee8f031cf238ced5f7514ad638 (diff)
tracing/histogram: Document expression arithmetic and constants
Histogram expressions now support division, and multiplication in addition to the already supported subtraction and addition operators. Numeric constants can also be used in a hist trigger expressions or assigned to a variable and used by refernce in an expression. Link: https://lkml.kernel.org/r/20211025200852.3002369-9-kaleshsingh@google.com Signed-off-by: Kalesh Singh <kaleshsingh@google.com> Reviewed-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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diff --git a/Documentation/trace/histogram.rst b/Documentation/trace/histogram.rst
index 533415644c54..e12699abaee8 100644
--- a/Documentation/trace/histogram.rst
+++ b/Documentation/trace/histogram.rst
@@ -1763,6 +1763,20 @@ using the same key and variable from yet another event::
# echo 'hist:key=pid:wakeupswitch_lat=$wakeup_lat+$switchtime_lat ...' >> event3/trigger
+Expressions support the use of addition, subtraction, multiplication and
+division operators (+-*/).
+
+Note that division by zero always returns -1.
+
+Numeric constants can also be used directly in an expression::
+
+ # echo 'hist:keys=next_pid:timestamp_secs=common_timestamp/1000000 ...' >> event/trigger
+
+or assigned to a variable and referenced in a subsequent expression::
+
+ # echo 'hist:keys=next_pid:us_per_sec=1000000 ...' >> event/trigger
+ # echo 'hist:keys=next_pid:timestamp_secs=common_timestamp/$us_per_sec ...' >> event/trigger
+
2.2.2 Synthetic Events
----------------------