linux-kernel - Re: [PATCH 06/10] perf sort: Drop ip_[lr] arguments from _sort__sym

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Date:	Fri, 11 Jan 2013 02:16:12 -0300
From:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>, Jiri Olsa <jolsa@...hat.com>,
	Namhyung Kim <namhyung.kim@....com>
Subject: Re: [PATCH 06/10] perf sort: Drop ip_[lr] arguments from
 _sort__sym_cmp()

Stephane, can you take a look at this one and provide feedback?

- Arnaldo

Em Thu, Dec 27, 2012 at 06:11:43PM +0900, Namhyung Kim escreveu:
> From: Namhyung Kim <namhyung.kim@....com>
> 
> Current _sort__sym_cmp() function is used for comparing symbols
> between two hist entries on symbol, symbol_from and symbol_to sort
> keys.  Those functions pass addresses of symbols but it's meaningless
> since it gets over-written inside of the _sort__sym_cmp function to a
> start address of the symbol.  So just get rid of them.
> 
> This might cause a difference than prior output for branch stacks
> since it seems not using start address of the symbol but branch
> address.  However AFAICS it'd be same as it gets overwritten anyway.
> 
> Also remove redundant part of code in sort__sym_cmp().
> 
> Cc: Stephane Eranian <eranian@...gle.com>
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>
> ---
>  tools/perf/util/sort.c | 23 ++++++-----------------
>  1 file changed, 6 insertions(+), 17 deletions(-)
> 
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index a36051b34901..c02964cabdd0 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -160,9 +160,10 @@ struct sort_entry sort_dso = {
>  
>  /* --sort symbol */
>  
> -static int64_t _sort__sym_cmp(struct symbol *sym_l, struct symbol *sym_r,
> -			      u64 ip_l, u64 ip_r)
> +static int64_t _sort__sym_cmp(struct symbol *sym_l, struct symbol *sym_r)
>  {
> +	u64 ip_l, ip_r;
> +
>  	if (!sym_l || !sym_r)
>  		return cmp_null(sym_l, sym_r);
>  
> @@ -178,21 +179,10 @@ static int64_t _sort__sym_cmp(struct symbol *sym_l, struct symbol *sym_r,
>  static int64_t
>  sort__sym_cmp(struct hist_entry *left, struct hist_entry *right)
>  {
> -	u64 ip_l, ip_r;
> -
>  	if (!left->ms.sym && !right->ms.sym)
>  		return right->level - left->level;
>  
> -	if (!left->ms.sym || !right->ms.sym)
> -		return cmp_null(left->ms.sym, right->ms.sym);
> -
> -	if (left->ms.sym == right->ms.sym)
> -		return 0;
> -
> -	ip_l = left->ms.sym->start;
> -	ip_r = right->ms.sym->start;
> -
> -	return _sort__sym_cmp(left->ms.sym, right->ms.sym, ip_l, ip_r);
> +	return _sort__sym_cmp(left->ms.sym, right->ms.sym);
>  }
>  
>  static int _hist_entry__sym_snprintf(struct map *map, struct symbol *sym,
> @@ -380,8 +370,7 @@ sort__sym_from_cmp(struct hist_entry *left, struct hist_entry *right)
>  	if (!from_l->sym && !from_r->sym)
>  		return right->level - left->level;
>  
> -	return _sort__sym_cmp(from_l->sym, from_r->sym, from_l->addr,
> -			     from_r->addr);
> +	return _sort__sym_cmp(from_l->sym, from_r->sym);
>  }
>  
>  static int64_t
> @@ -393,7 +382,7 @@ sort__sym_to_cmp(struct hist_entry *left, struct hist_entry *right)
>  	if (!to_l->sym && !to_r->sym)
>  		return right->level - left->level;
>  
> -	return _sort__sym_cmp(to_l->sym, to_r->sym, to_l->addr, to_r->addr);
> +	return _sort__sym_cmp(to_l->sym, to_r->sym);
>  }
>  
>  static int hist_entry__sym_from_snprintf(struct hist_entry *self, char *bf,
> -- 
> 1.7.11.7
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