linux-kernel - Re: [PATCH 10/15 V3] perf, c2c: Display cacheline HITM analysis to stdout

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Date:	Wed, 09 Apr 2014 08:46:29 +0900
From:	Namhyung Kim <namhyung@...il.com>
To:	Don Zickus <dzickus@...hat.com>
Cc:	acme@...stprotocols.net, LKML <linux-kernel@...r.kernel.org>,
	jolsa@...hat.com, jmario@...hat.com, fowles@...each.com,
	peterz@...radead.org, eranian@...gle.com, andi.kleen@...el.com
Subject: Re: [PATCH 10/15 V3] perf, c2c: Display cacheline HITM analysis to stdout

Hi Don,

On Mon, 24 Mar 2014 15:37:01 -0400, Don Zickus wrote:
> +	sprintf(summary, "%4d %5.1f%% %5.1f%% %5.1f%% %5.1f%% %8d %8d %8d %8d %18s %6s\n",
> +			record,
> +			tot_dist * 100.,
> +			tot_cumm * 100.,
> +			ld_dist * 100.,
> +			ld_cumm * 100.,

I think adding a 0 after decimal point helps readability little bit.


> +			h->stats.t.rmt_hitm,
> +			h->stats.t.lcl_hitm,
> +			h->stats.t.st_l1hit,
> +			h->stats.t.st_l1miss,
> +			addrstr,
> +			pidstr);
> +
> +	for (j = 0; j < (int)strlen(summary); j++) printf("-");
> +	printf("\n");
> +	printf("%s", summary);
> +	for (j = 0; j < (int)strlen(summary); j++) printf("-");
> +	printf("\n");
> +}
> +
> +static void print_socket_stats_str(struct c2c_hit *clo,
> +				   struct c2c_stats *node_stats)
> +{
> +	int i, j;
> +
> +	if (!node_stats)
> +		return;
> +
> +	for (i = 0; i < max_node_num; i++) {
> +		struct c2c_stats *stats = &node_stats[i];
> +		int num = CPU_COUNT(&stats->cpuset);
> +
> +		if (!num) {
> +			/* pad align socket info */
> +			for (j = 0; j < 21; j++)
> +				printf(" ");
> +			continue;
> +		}
> +
> +		printf("%2d{%2d ", i, num);
> +
> +		if (clo->stats.t.rmt_hitm > 0)
> +			printf("%5.1f%% ", 100. * ((double)stats->t.rmt_hitm / (double) clo->stats.t.rmt_hitm));

Just for your information, most perf tools show 2 digit after decimal
point so it'd be "%5.2f%%" but it's not a strict rule.

Anyway I think multiplying 100.0 first can remove the casts.  So code
below will do the same thing..

		100.0 * stats->t.rmt_hitm / clo->stats.t.rmt_hitm

The same goes to other percentage calculations too.

Thanks,
Namhyung


> +		else
> +			printf("%6s ", "n/a");
> +
> +		if (clo->stats.t.store > 0)
> +			printf("%5.1f%%} ", 100. * ((double)stats->t.store / (double)clo->stats.t.store));
> +		else
> +			printf("%6s} ", "n/a");
> +	}
> +}
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