Messages in this thread |  | | From | Mark Rutland <> | Subject | [PATCH 0/2] tracing/hist: add a modulus operator | Date | Thu, 2 Mar 2023 17:17:53 +0000 |
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I've been analysing some usercopy code, and wanted to cpature the spread of sizes and alignment of copies for a workload. I found that histrogram triggers were great for cpaturing the size, but there's not currently a way to capture the alignment short of recording the entire base pointer and post-processing the histogram, which is less than ideal.
These patches add a modulus operator to histogram expressions, so which allows the alignment of pointers to be captured directly.
The first patch is a preparatory refactoring to the expression parsing code, and the second actually adds the new operator.
Thanks, Mark.
Mark Rutland (2): tracing/hist: simplify contains_operator() tracing/hist: add modulus operator
Documentation/trace/histogram.rst | 4 +- kernel/trace/trace_events_hist.c | 109 ++++++++++++++++-------------- 2 files changed, 62 insertions(+), 51 deletions(-)
-- 2.30.2
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