linux-kernel - Re: [PATCH v4 5/5] perf report: Show branch type in callchain entry

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <c26d35d6-cfa9-3735-363c-05e5be981082@linux.intel.com>
Date:   Wed, 19 Apr 2017 08:33:56 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com,
        Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com,
        linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v4 5/5] perf report: Show branch type in callchain entry



On 4/19/2017 2:53 AM, Jiri Olsa wrote:
> On Wed, Apr 12, 2017 at 06:21:06AM +0800, Jin Yao wrote:
>
> SNIP
>
>> +static int branch_type_str(struct branch_type_stat *stat,
>> +			   char *bf, int bfsize)
>> +{
>> +	int i, j = 0, printed = 0;
>> +	u64 total = 0;
>> +
>> +	for (i = 0; i < PERF_BR_MAX; i++)
>> +		total += stat->counts[i];
>> +
>> +	if (total == 0)
>> +		return 0;
>> +
>> +	printed += scnprintf(bf + printed, bfsize - printed, " (");
>> +
>> +	if (stat->jcc_fwd > 0) {
>> +		j++;
>> +		printed += scnprintf(bf + printed, bfsize - printed,
>> +				     "JCC forward");
>> +	}
>> +
>> +	if (stat->jcc_bwd > 0) {
>> +		if (j++)
>> +			printed += scnprintf(bf + printed, bfsize - printed,
>> +					     " JCC backward");
>> +		else
>> +			printed += scnprintf(bf + printed, bfsize - printed,
>> +					     "JCC backward");
>> +	}
>> +
>> +	if (stat->cross_4k > 0) {
>> +		if (j++)
>> +			printed += scnprintf(bf + printed, bfsize - printed,
>> +					     " CROSS_4K");
>> +		else
>> +			printed += scnprintf(bf + printed, bfsize - printed,
>> +					     "CROSS_4K");
>> +	}
> could that 2 legs if be shortened to just one scnprintf like (untested):
>
>     printed += scnprintf(bf + printed, bfsize - printed, "%s%s", j++ ? " " : "", "CROSS_4K");
>
> I'd also probably use some kind of macro or function
> with all that similar code, but I dont insist ;-)
>
> thanks,
> jirka

Thanks for this suggestion. I will use this kind of code. Of course, I 
will test. :)

Thanks
Jin Yao