linux-kernel - Re: [PATCH 13/23] perf hists: Support filtering in hierarchy mode

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Date:	Wed, 10 Feb 2016 13:11:19 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Namhyung Kim <namhyung@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Ingo Molnar <mingo@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Jiri Olsa <jolsa@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	David Ahern <dsahern@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Stephane Eranian <eranian@...gle.com>,
	Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 13/23] perf hists: Support filtering in hierarchy mode

On Fri, Feb 05, 2016 at 10:01:45PM +0900, Namhyung Kim wrote:

SNIP

> +			/* force to go to sibling in the hierarchy */
> +			saved_unfolded = h->unfolded;
> +			h->unfolded = false;
> +
> +			nd = rb_hierarchy_next(&h->rb_node);
> +			h->unfolded = saved_unfolded;
> +		}
> +	}
> +
> +	/* resort output (top-level entries only) */
> +	nd = rb_first(&hists->entries);
> +	while (nd) {
> +		struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);
> +
> +		nd = rb_next(nd);
> +		rb_erase(&h->rb_node, &hists->entries);
> +
> +		__hists__insert_output_entry(&tmp, h, 0, false);
> +	}

what's the purpose of this resort? the only affect I see
is to recalculate callchains

thanks,
jirka