linux-kernel - Re: [Patch v1 08/10] perf report: add support for mem access profiling

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Date:	Wed, 31 Oct 2012 15:01:45 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	ak@...ux.intel.com, acme@...hat.com, jolsa@...hat.com,
	ming.m.lin@...el.com
Subject: Re: [Patch v1 08/10] perf report: add support for mem access profiling

On Mon, 29 Oct 2012 16:15:50 +0100, Stephane Eranian wrote:
> This patch adds the --mem-mode option to perf report.
>
> This mode requires a perf.data file created with memory
> access samples.
>
> Signed-off-by: Stephane Eranian <eranian@...gle.com>
> ---
[snip]
> +	cost = mi->cost;
> +	if (!cost)
> +		cost = 1;
> +
> +	/*
> +	 * The report shows the percentage of total branches captured
> +	 * and not events sampled. Thus we use a pseudo period of 1.

But cost won't be 1 anymore if PERF_SAMPLE_COST set, right?


> +	 * Only in the newt browser we are doing integrated annotation,
> +	 * so we don't allocated the extra space needed because the stdio
> +	 * code will not use it.

Yes, and gtk too.


> +	 */
> +	he = __hists__add_mem_entry(&evsel->hists, al, parent, mi,
> +				    cost);
> +	if (!he)
> +		return -ENOMEM;
> +
> +	if (sort__has_sym && he->ms.sym && use_browser > 0) {

So I'd rather write 'use_browser == 1' instead of '> 0'.


> +		struct annotation *notes = symbol__annotation(he->ms.sym);
> +
> +		assert(evsel != NULL);
> +
> +		if (notes->src == NULL && symbol__alloc_hist(he->ms.sym) < 0)
> +			goto out;
> +
> +		err = hist_entry__inc_addr_samples(he, evsel->idx, al->addr);
> +		if (err)
> +			goto out;
> +	}
> +
> +	if (sort__has_sym && he->mem_info->daddr.sym && use_browser > 0) {

Ditto.

Thanks,
Namhyung
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