linux-kernel - Re: [PATCH 1/2] trace_stat: keep original order

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Date:	Wed, 25 Mar 2009 10:36:38 -0400
From:	Steven Rostedt <srostedt@...hat.com>
To:	Lai Jiangshan <laijs@...fujitsu.com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Frederic Weisbecker <fweisbec@...il.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] trace_stat: keep original order


On Wed, 2009-03-25 at 16:58 +0800, Lai Jiangshan wrote:
> Impact: make trace_stat files show items with the original order
> 
> trace_stat tracer reverse the items, it makes the output
> looks a little ugly.
> 
> Example, when we read trace_stat/workqueues, we get cpu#7's stat.
> at first, and then cpu#6... cpu#0.
> 

This doesn't reverse the order of the annotated branch profiler, does
it?

-- Steve

> Signed-off-by: Lai Jiangshan <laijs@...fujitsu.com>
> ---
> diff --git a/kernel/trace/trace_stat.c b/kernel/trace/trace_stat.c
> index f71b85b..c08e7f1 100644
> --- a/kernel/trace/trace_stat.c
> +++ b/kernel/trace/trace_stat.c
> @@ -125,23 +125,21 @@ static int stat_seq_init(struct tracer_stat_session *session)
>  		INIT_LIST_HEAD(&new_entry->list);
>  		new_entry->stat = stat;
>  
> -		list_for_each_entry(iter_entry, &session->stat_list, list) {
> +		list_for_each_entry_reverse(iter_entry, &session->stat_list,
> +				list) {
>  
>  			/* Insertion with a descendent sorting */
> -			if (ts->stat_cmp(new_entry->stat,
> -						iter_entry->stat) > 0) {
> +			if (ts->stat_cmp(iter_entry->stat,
> +					new_entry->stat) >= 0) {
>  
> -				list_add_tail(&new_entry->list,
> -						&iter_entry->list);
> -				break;
> -
> -			/* The current smaller value */
> -			} else if (list_is_last(&iter_entry->list,
> -						&session->stat_list)) {
>  				list_add(&new_entry->list, &iter_entry->list);
>  				break;
>  			}
>  		}
> +
> +		/* The current larger value */
> +		if (list_empty(&new_entry->list))
> +			list_add(&new_entry->list, &session->stat_list);
>  	}
>  exit:
>  	mutex_unlock(&session->stat_mutex);
> 
> 

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