linux-kernel - Re: [PATCH v4 5/5] perf metric: Don't compute unused events.

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Date:   Tue, 1 Dec 2020 22:36:57 -0800
From:   Andi Kleen <ak@...ux.intel.com>
To:     Ian Rogers <irogers@...gle.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org, Jin Yao <yao.jin@...ux.intel.com>,
        John Garry <john.garry@...wei.com>,
        Paul Clarke <pc@...ibm.com>, kajoljain <kjain@...ux.ibm.com>,
        Stephane Eranian <eranian@...gle.com>,
        Sandeep Dasgupta <sdasgup@...gle.com>
Subject: Re: [PATCH v4 5/5] perf metric: Don't compute unused events.

> +| expr '-' expr
> +{
> +	if (!compute_ids || (is_const($1.val) && is_const($3.val))) {
> +		assert($1.ids == NULL);
> +		assert($3.ids == NULL);
> +		$$.val = $1.val - $3.val;
> +		$$.ids = NULL;
> +	} else {
> +		/* LHS and/or RHS need computing from event IDs so union. */
> +		$$ = union_expr($1, $3);
> +	}

Can't this be all in a macro? It's still a lot of duplication.

I'm still not a fan, but I think with a macro it wouldn't be too bad.


-Andi