linux-kernel - Re: [PATCH 05/21] perf hists: Accumulate hist entry stat based on the callchain

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Message-ID: <87bnzped74.fsf@sejong.aot.lge.com>
Date:	Mon, 06 Jan 2014 17:17:51 +0900
From:	Namhyung Kim <namhyung@...nel.org>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Paul Mackerras <paulus@...ba.org>,
	Ingo Molnar <mingo@...nel.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Arun Sharma <asharma@...com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Rodrigo Campos <rodrigo@...g.com.ar>
Subject: Re: [PATCH 05/21] perf hists: Accumulate hist entry stat based on the callchain

On Sun, 5 Jan 2014 18:15:28 +0100, Jiri Olsa wrote:
> On Sun, Jan 05, 2014 at 05:58:31PM +0100, Jiri Olsa wrote:
>> On Tue, Dec 24, 2013 at 05:22:11PM +0900, Namhyung Kim wrote:
>> > +	/*
>> > +	 * This is for putting parents upward during output resort iff
>> > +	 * only a child gets sampled.  See hist_entry__sort_on_period().
>> > +	 */
>> > +	he->callchain->max_depth = PERF_MAX_STACK_DEPTH + 1;
>> 
>> so you're using callchain struct to hold the entry's stack
>> position for sorting.. I think we could store this info
>> inside hist_entry itself, and omit 'struct callchain_root'
>> size being allocated for hist_entry

I know it's hacky - it's to keep the sorting properly orderes entries
without callchain support Arun requested.  And I think I can add the
callchain support in the next version so it should be cleaned up too.

>> 
>> I checked 'struct hist_entry' and the 'position' entry seems to
>> be abandonned ;-)) or we could use some unused entry (mem_info?)
>> and create some union.

Yes, I also have a plan to cleanup/diet the struct hist_entry. :)

>
> also perhaps above 5 lines should be part of the later commit:
>   perf hists: Sort hist entries by accumulated period

As I said it'll be changed in the next version.

Thanks,
Namhyung
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