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Date: Sun, 17 Jan 2016 17:15:33 +0100
From: Jiri Olsa <jolsa@redhat.com>
To: Namhyung Kim <namhyung@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>, Ingo Molnar <mingo@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>, Jiri Olsa <jolsa@kernel.org>,
        LKML <linux-kernel@vger.kernel.org>, David Ahern <dsahern@gmail.com>,
        Stephane Eranian <eranian@google.com>,
        Andi Kleen <andi@firstfloor.org>, Wang Nan <wangnan0@huawei.com>
Subject: Re: [PATCH 01/17] perf hists: Basic support of hierarchical report
 view
Message-ID: <20160117161533.GC17618@krava.redhat.com>
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On Sun, Jan 17, 2016 at 01:03:01AM +0900, Namhyung Kim wrote:

SNIP

>  	char			*srcfile;
>  	struct symbol		*parent;
> -	struct rb_root		sorted_chain;
>  	struct branch_info	*branch_info;
>  	struct hists		*hists;
>  	struct mem_info		*mem_info;
>  	void			*raw_data;
>  	u32			raw_size;
>  	void			*trace_output;
> +	struct perf_hpp_fmt	*fmt;
> +	struct hist_entry	*parent_he;
> +	union {
> +		/* this is for hierarchical entry structure */
> +		struct {
> +			struct rb_root	hroot_in;
> +			struct rb_root  hroot_out;
> +		};				/* non-leaf entries */
> +		struct rb_root	sorted_chain;	/* leaf entry has callchains */
> +	};

looks like cool feature!

could we have the hist_entry storage little more generic?
and maybe dynamically allocated?

I'm doing the same thing for the c2c stuff, like having
for each hist_entry its own 'struct hists' object, which
records data related to parent hist_entry

maybe we could strip the 'hists' object to some bare minimum
which is needed for store/sort/stat and display entries
in hists_browser ;-)

I'm preparing RFC patchset in my perf/c2c branch, if you want
to take a look

however, as I said above, for my own sake it all boils down
to have 'hists' object within hist_entry, so I can use it
in the UI code easily

FYI I also added support for hists object's own sort/output
format lists.. which I'll curve out and send for review soon

thanks,
jirka