linux-kernel - Re: [PATCH v2 1/3] perf util: Move block_pair

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Date:   Tue, 7 Jan 2020 10:57:33 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Jin Yao <yao.jin@...ux.intel.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
Subject: Re: [PATCH v2 1/3] perf util: Move block_pair_cmp to block-info

On Tue, Jan 07, 2020 at 03:45:23AM +0800, Jin Yao wrote:
> block_pair_cmp() is a function which is used to compare
> two blocks. Moving it from builtin-diff.c to block-info.c
> to let it be used by other builtins.
> 
> In block_pair_cmp, there is a minor change. It checks valid
> for map, dso and sym first. If they are invalid, we will not
> compare the address because the address might not make sense.

please separate the change as well, it's hard to track
what you did when the whole function is moved

> 
>  v2:
>  ---
>  New patch created in v2
> 
> Signed-off-by: Jin Yao <yao.jin@...ux.intel.com>
> ---
>  tools/perf/builtin-diff.c    | 17 -----------------
>  tools/perf/util/block-info.c | 23 +++++++++++++++++++++++
>  tools/perf/util/block-info.h |  2 ++
>  3 files changed, 25 insertions(+), 17 deletions(-)
> 
> diff --git a/tools/perf/builtin-diff.c b/tools/perf/builtin-diff.c
> index f8b6ae557d8b..5ff1e21082cb 100644
> --- a/tools/perf/builtin-diff.c
> +++ b/tools/perf/builtin-diff.c
> @@ -572,23 +572,6 @@ static void init_block_hist(struct block_hist *bh)
>  	bh->valid = true;
>  }
>  
> -static int block_pair_cmp(struct hist_entry *a, struct hist_entry *b)
> -{
> -	struct block_info *bi_a = a->block_info;
> -	struct block_info *bi_b = b->block_info;
> -	int cmp;
> -
> -	if (!bi_a->sym || !bi_b->sym)
> -		return -1;
> -
> -	cmp = strcmp(bi_a->sym->name, bi_b->sym->name);
> -
> -	if ((!cmp) && (bi_a->start == bi_b->start) && (bi_a->end == bi_b->end))
> -		return 0;
> -
> -	return -1;
> -}
> -
>  static struct hist_entry *get_block_pair(struct hist_entry *he,
>  					 struct hists *hists_pair)
>  {
> diff --git a/tools/perf/util/block-info.c b/tools/perf/util/block-info.c
> index c4b030bf6ec2..18a445938681 100644
> --- a/tools/perf/util/block-info.c
> +++ b/tools/perf/util/block-info.c
> @@ -475,3 +475,26 @@ float block_info__total_cycles_percent(struct hist_entry *he)
>  
>  	return 0.0;
>  }
> +
> +int block_pair_cmp(struct hist_entry *pair, struct hist_entry *he)
> +{
> +	struct block_info *bi_p = pair->block_info;
> +	struct block_info *bi_h = he->block_info;
> +	struct map_symbol *ms_p = &pair->ms;
> +	struct map_symbol *ms_h = &he->ms;
> +	int cmp;
> +
> +	if (!ms_p->map || !ms_p->map->dso || !ms_p->sym ||
> +	    !ms_h->map || !ms_h->map->dso || !ms_h->sym) {
> +		return -1;
> +	}
> +
> +	cmp = strcmp(ms_p->sym->name, ms_h->sym->name);
> +	if (cmp)
> +		return -1;

should this return cmp? also you don't mention this change in the changelog

thanks,
jirka