tracing/histogram: Covert expr to const if both operands are constants

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If both operands of a hist trigger expression are constants, convert the
expression to a constant. This optimization avoids having to perform the
same calculation multiple times and also saves on memory since the
merged constants are represented by a single struct hist_field instead
or multiple.

Link: https://lkml.kernel.org/r/20211025200852.3002369-6-kaleshsingh@google.com

Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
Suggested-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

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Kalesh Singh 2021-10-25 13:08:37 -07:00 • committed by Steven Rostedt (VMware)

parent c5eac6ee8b

commit f47716b7a9

1 changed files with 74 additions and 30 deletions

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kernel/trace/trace_events_hist.c

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