linux-kernel - Re: [PATCH] perf sort: only insert overhead && overhead

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Date:   Wed, 15 Mar 2017 10:06:08 +0800
From:   "Du, Changbin" <changbin.du@...el.com>
To:     changbin.du@...el.com
Cc:     peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] perf sort: only insert overhead && overhead_children
 when no overhead* field given

hi, Arnaldo,
Seems you missed this one. In some case, sort by 'Children' first doesn't make
sense, bacause I only care the 'Self' overhead.

btw, does perf have a option that only calculate the *real* callee 'overhead_acc'?
I mean only count the samples to parent when it is called by parent. For
example,

fun1		fun2
  foo		  foo

Then the 'overhead_acc' for fun1 should not include the samples that fun2 call foo.
Thanks.
changbin

On Mon, Mar 13, 2017 at 04:36:01PM +0800, changbin.du@...el.com wrote:
> From: Changbin Du <changbin.du@...el.com>
> 
> If we always insert 'overhead' and 'overhead_children' as sort keys,
> this make it impossible to sort as overhead (which displayed as Self)
> first. This patch forbid adding any overhead* field if there is one
> already given.
> 
> Signed-off-by: Changbin Du <changbin.du@...el.com>
> ---
>  tools/perf/util/sort.c | 7 +++++++
>  1 file changed, 7 insertions(+)
> 
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index b6db140..7695b54 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -2543,6 +2543,13 @@ static char *setup_overhead(char *keys)
>  	if (sort__mode == SORT_MODE__DIFF)
>  		return keys;
>  
> +	/*
> +	 * Only insert overhead && overhead_children when
> +	 * no overhead* field given.
> +	 */
> +	if (strstr(keys, "overhead"))
> +		return keys;
> +
>  	keys = prefix_if_not_in("overhead", keys);
>  
>  	if (symbol_conf.cumulate_callchain)
> -- 
> 2.7.4
> 

-- 
Thanks,
Changbin Du

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