Re: [PATCH v9 7/9] perf c2c: build and finalize the function view hierarchy

> Add the builder that walks the top-level cacheline entries and, for each
> read-side function, correlates the functions that write the same lines
> (level 2) and the specific cachelines they contend over (level 3) within
> each retained detail histogram. Aggregate the write traffic per contending
> function, resort by store count, and prune writers/functions with no
> contention. The finalize pass then computes the Cycles % denominator from
> the surviving level-1 entries after pruning, so the column shows each
> function's share of the functions retained in the table rather than of the
> whole recording -- the semantics documented for Cycles % in perf-c2c.txt.
> 
> Expose c2c_function__build() and c2c_function__reset() for the TUI front
> end added by the next patch. The builder requires iaddr in the cacheline
> coalescing fields and returns the completed hists through an output
> argument. Validate the inputs before replacing an existing model.
> 
> Function-view entries do not carry callchains. Suppress callchain handling
> while building and tearing down the model so the common API does not depend
> on the caller's current callchain setting.
> 
> Signed-off-by: Jiebin Sun <[email protected]>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/[email protected]?part=7