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

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Date:	Wed, 10 Feb 2016 12:51:22 +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

> +			parent = parent->parent_he;
> +		}
> +	}
> +
>  	if (h->filtered)
>  		return;
>  
> @@ -1592,28 +1613,122 @@ static void hists__filter_by_type(struct hists *hists, int type, filter_fn_t fil
>  	}
>  }
>  
> +static void hists__filter_hierarchy(struct hists *hists, int type, const void *arg)
> +{
> +	struct rb_node *nd;
> +	struct rb_root tmp = RB_ROOT;
> +	bool saved_unfolded;
> +
> +	hists->stats.nr_non_filtered_samples = 0;
> +
> +	hists__reset_filter_stats(hists);
> +	hists__reset_col_len(hists);
> +
> +	nd = rb_first(&hists->entries);
> +	while (nd) {
> +		struct hist_entry *h = rb_entry(nd, struct hist_entry, rb_node);
> +		int ret;
> +
> +		ret = hist_entry__filter(h, type, arg);
> +
> +		/*
> +		 * case 1. non-matching type
> +		 * zero out the period, set filtered and move to child
> +		 */
> +		if (ret < 0) {
> +			memset(&h->stat, 0, sizeof(h->stat));
> +			h->filtered |= (1 << type);
> +
> +			/* force to go down in the hierarchy */
> +			saved_unfolded = h->unfolded;
> +			h->unfolded = true;
> +
> +			nd = rb_hierarchy_next(&h->rb_node);
> +			h->unfolded = saved_unfolded;
> +		}
> +		/*
> +		 * case 2. matched (filter out)
> +		 * set filtered and move to next
> +		 */
> +		else if (ret == 1) {

slightly confused in here.. so ret == 1 means we matched
but for example hist_entry__sym_filter:

+       return sym && (!he->ms.sym || !strstr(he->ms.sym->name, sym));

returns 1 if we DONT match the symbol

I always got confused by non/filtered stuff.. I think we should change
the those names, but haven't come with anything so far..

jirka