linux-kernel - Re: [PATCH v3 10/11] perf tools report: Implement browsing of individual samples

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Date:   Mon, 4 Mar 2019 16:27:33 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     acme@...nel.org, jolsa@...nel.org,
        linux-perf-users@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH v3 10/11] perf tools report: Implement browsing of
 individual samples

On Thu, Feb 28, 2019 at 10:35:49AM -0800, Andi Kleen wrote:

SNIP

> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index 6040eb49ea23..ba8a58f2cdd0 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -593,6 +593,40 @@ static struct hist_entry *hists__findnew_entry(struct hists *hists,
>  	return he;
>  }
>  
> +static unsigned random_max(unsigned high)
> +{
> +	unsigned thresh = -high % high;
> +	for (;;) {
> +		unsigned r = random();
> +		if (r >= thresh)
> +			return r % high;
> +	}
> +}
> +
> +static void hists__res_sample(struct hist_entry *he, struct perf_sample *sample)
> +{
> +	struct res_sample *r;
> +	int j;
> +
> +	if (!he->res_samples) {
> +		he->res_samples = calloc(sizeof(struct res_sample),
> +					symbol_conf.res_sample);
> +		if (!he->res_samples)
> +			return;
> +	}

please allocate this in hist_entry__init

thanks,
jirka