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Date: Fri, 4 Mar 2016 18:48:48 -0300
From: Arnaldo Carvalho de Melo <acme@kernel.org>
To: Namhyung Kim <namhyung@kernel.org>
Cc: Ingo Molnar <mingo@kernel.org>, Peter Zijlstra <peterz@infradead.org>,
        Jiri Olsa <jolsa@kernel.org>, LKML <linux-kernel@vger.kernel.org>,
        David Ahern <dsahern@gmail.com>, Andi Kleen <andi@firstfloor.org>,
        Stephane Eranian <eranian@google.com>, Wang Nan <wangnan0@huawei.com>
Subject: Re: [PATCH v2 4/8] perf tools: Support multiple sort keys in a
 hierarchy level
Message-ID: <20160304214848.GY3604@kernel.org>
References: <1457103582-28396-1-git-send-email-namhyung@kernel.org>
 <1457103582-28396-5-git-send-email-namhyung@kernel.org>
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Em Fri, Mar 04, 2016 at 11:59:38PM +0900, Namhyung Kim escreveu:
> This implements having multiple sort keys in a single hierarchy level.

> +++ b/tools/perf/util/sort.c
> @@ -2310,18 +2310,40 @@ static int setup_sort_list(char *str, struct perf_evlist *evlist)
>  	char *tmp, *tok;
>  	int ret = 0;
>  	int level = 0;
> +	int next_level = 1;
> +	bool in_group = false;
> +
> +	do {
> +		tok = str;
> +		tmp = strpbrk(str, "{}, ");

Ok, I'll test this, but since we use lex/yacc for parsing event
descriptions, perhaps we should use it here as well? Or do you think
we're stopping at this level of complexity (I doubt) :-)

> +		if (tmp) {
> +			if (in_group)
> +				next_level = level;
> +			else
> +				next_level = level + 1;
> +
> +			if (*tmp == '{')
> +				in_group = true;
> +			else if (*tmp == '}')
> +				in_group = false;
> +
> +			*tmp = '\0';
> +			str = tmp + 1;
> +		}
>  
> -	for (tok = strtok_r(str, ", ", &tmp);
> -			tok; tok = strtok_r(NULL, ", ", &tmp)) {
> -		ret = sort_dimension__add(tok, evlist, level++);
> -		if (ret == -EINVAL) {
> -			error("Invalid --sort key: `%s'", tok);
> -			break;
> -		} else if (ret == -ESRCH) {
> -			error("Unknown --sort key: `%s'", tok);
> -			break;
> +		if (*tok) {
> +			ret = sort_dimension__add(tok, evlist, level);
> +			if (ret == -EINVAL) {
> +				error("Invalid --sort key: `%s'", tok);
> +				break;
> +			} else if (ret == -ESRCH) {
> +				error("Unknown --sort key: `%s'", tok);
> +				break;
> +			}
>  		}
> -	}
> +
> +		level = next_level;
> +	} while (tmp);
>  
>  	return ret;
>  }
> -- 
> 2.7.2