linux-kernel - Re: [PATCH v5 3/4] perf, tools: Add support for printing new mem

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Date:   Wed, 23 Aug 2017 15:01:48 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Andi Kleen <andi@...stfloor.org>
Cc:     peterz@...radead.org, acme@...nel.org, jolsa@...nel.org,
        linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
        Joe Mario <jmario@...hat.com>
Subject: Re: [PATCH v5 3/4] perf, tools: Add support for printing new
 mem_info encodings

On Wed, Aug 16, 2017 at 03:21:55PM -0700, Andi Kleen wrote:

SNIP

>  int perf_mem__lvl_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
>  {
>  	size_t i, l = 0;
>  	u64 m =  PERF_MEM_LVL_NA;
>  	u64 hit, miss;
> +	int printed;
>  
>  	if (mem_info)
>  		m  = mem_info->data_src.mem_lvl;
> @@ -184,17 +193,37 @@ int perf_mem__lvl_scnprintf(char *out, size_t sz, struct mem_info *mem_info)
>  	/* already taken care of */
>  	m &= ~(PERF_MEM_LVL_HIT|PERF_MEM_LVL_MISS);
>  
> +
> +	if (mem_info && mem_info->data_src.mem_remote) {
> +		strcat(out, "Remote ");
> +		l += 7;
> +	}

Andi,
how is this 'Remote' different from the remote levels in mem_lvl?

        "Remote RAM (1 hop)",
        "Remote RAM (2 hops)",
        "Remote Cache (1 hop)",
        "Remote Cache (2 hops)",

thanks,
jirka

> +
> +	printed = 0;
>  	for (i = 0; m && i < ARRAY_SIZE(mem_lvl); i++, m >>= 1) {
>  		if (!(m & 0x1))
>  			continue;
> -		if (l) {
> +		if (printed++) {
>  			strcat(out, " or ");
>  			l += 4;
>  		}
>  		l += scnprintf(out + l, sz - l, mem_lvl[i]);
>  	}
> -	if (*out == '\0')
> -		l += scnprintf(out, sz - l, "N/A");
> +
> +	if (mem_info && mem_info->data_src.mem_lvl_num) {
> +		int lvl = mem_info->data_src.mem_lvl_num;
> +		if (printed++) {
> +			strcat(out, " or ");
> +			l += 4;
> +		}
> +		if (mem_lvlnum[lvl])
> +			l += scnprintf(out + l, sz - l, mem_lvlnum[lvl]);
> +		else
> +			l += scnprintf(out + l, sz - l, "L%d", lvl);
> +	}