From: Namhyung Kim <namhyung@kernel.org>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>,
Peter Zijlstra <a.p.zijlstra@chello.nl>,
Paul Mackerras <paulus@samba.org>, Ingo Molnar <mingo@kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
Stephane Eranian <eranian@google.com>,
Andi Kleen <andi@firstfloor.org>,
Namhyung Kim <namhyung.kim@lge.com>
Subject: Re: [PATCH 12/18] perf ui/hist: Add support for event group view
Date: Mon, 03 Dec 2012 19:39:31 +0900 [thread overview]
Message-ID: <87a9tvifmk.fsf@sejong.aot.lge.com> (raw)
In-Reply-To: <20121203102327.GB1131@krava.redhat.com> (Jiri Olsa's message of "Mon, 3 Dec 2012 11:23:27 +0100")
On Mon, 3 Dec 2012 11:23:27 +0100, Jiri Olsa wrote:
> On Mon, Dec 03, 2012 at 10:56:28AM +0900, Namhyung Kim wrote:
>> On Fri, Nov 30, 2012 at 10:29 PM, Jiri Olsa <jolsa@redhat.com> wrote:
>> > ok, so this is the part thats common for both multi diff and group
>> > report and hugely depends on how we link matching hist_entry
>> >
>> > To sum to what group report does here:
>> >
>> > 1) starting with event group
>> > 2) the function 'he' belongs to leader hists
>> > 3) display leaders data value
>> > 4) if 'symbol_conf.event_group' is enabled, we want to display all
>> > group members data values in a column
>> > 5) say we have group of 3 events 'e1,e2,e3' and e1 being the leader,
>> > we have following possibilities:
>> > - e1 have no pairs
>> > - e1 is paired with e2
>> > - e1 is paired with e3
>> > - e1 is paired with e2 and e3 (e1 could also be dummy one)
>> > 6) need to display 3 values wrt to e1,e2,e3 output order
>> > 7) because events belongs to a group, each evsel carries group idx
>> > 8) so we walk all pairs and compute the eX value and put it
>> > into temporary array based on its group idx
>> > 9) finally we display all temporary array values
>> >
>> >
>> > To sum up what multi diff needs to do here:
>> >
>> > 1) starting with 3 separate matching events from different
>> > evlists(sessions)
>> > 2 - 5) are similar
>> > 6) need to display single diff value of hist_entry that
>> > belongs to evsel, that belongs to a column we are just
>> > displaying value for
>> > 7) events are not part of group; based on
>> > [PATCH 02/14] perf tool: Add struct perf_hpp_fmt into hpp callbacks
>> > we can tell what column we are in -> session -> evlist
>> > 8) we need to walk all pairs and for each hist_entry:
>> > - compare all evsels (from point 7 evlist)
>> > and match hists pointer
>> > - when found, we have a matching hist_entry for this column
>> > 9) print out the value of matching hist_entry
>> >
>> >
>> > I think both this processing could be simplified by having hist_entry
>> > pairs connected via array and not linked list.
>> >
>> >
>> > For group report, each leader hist_entry would have 'pairs' array
>> > with the size of event group. Then we could omit the temporary array
>> > creation by:
>> > - walking the leaders pairs
>> > - when pair is found -> compute data -> display
>> > - when pair is NULL -> display 0
>> >
>> >
>> > For multi diff, each baseline hist_entry would have 'pairs' array
>> > with the size equal to number of data files on diff command input.
>> > This way we could use the data from point 7 to directly access
>> > related hist_entry.
>> >
>> >
>> > ufff... thoughts? ;-)
>>
>> Nice summary, really! :)
>>
>> Yeah, I do think it's better to use array for this. If Arnaldo has no
>> objection to this approach, I'll convert my code to use the array.
>
> we discussed with Arnaldo and decided to stay with current approach and
> make the change later if needed.. to be able to see/meassure the benefit
>
> I made some initial attempt to workaround this and it appears to be
> not that bad ;) I'll repost my changes shortly..
Hmm.. so are you OK with this patch now?
Thanks,
Namhyung
next prev parent reply other threads:[~2012-12-03 10:39 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-11-29 6:38 [PATCH 00/18] perf report: Add support for event group view (v6) Namhyung Kim
2012-11-29 6:38 ` Namhyung Kim
2012-11-29 12:21 ` Jiri Olsa
2012-11-29 6:38 ` [PATCH 01/18] perf evsel: Set leader evsel's ->leader to itself Namhyung Kim
2012-11-29 14:28 ` Jiri Olsa
2013-01-24 18:48 ` [tip:perf/core] " tip-bot for Namhyung Kim
2012-11-29 6:38 ` [PATCH 02/18] perf evsel: Convert to _is_group_leader method Namhyung Kim
2012-11-29 14:28 ` Jiri Olsa
2013-01-24 18:49 ` [tip:perf/core] " tip-bot for Namhyung Kim
2012-11-29 6:38 ` [PATCH 03/18] perf tools: Keep group information Namhyung Kim
2012-11-29 14:33 ` Jiri Olsa
2012-11-29 14:58 ` Namhyung Kim
2012-11-29 15:02 ` Jiri Olsa
2012-11-29 15:09 ` Namhyung Kim
2012-11-29 19:09 ` Arnaldo Carvalho de Melo
2012-12-03 1:12 ` Namhyung Kim
2012-11-29 6:38 ` [PATCH 04/18] perf header: Add HEADER_GROUP_DESC feature Namhyung Kim
2012-11-29 18:43 ` Arnaldo Carvalho de Melo
2012-12-03 1:16 ` Namhyung Kim
2012-11-29 6:38 ` [PATCH 05/18] perf tools: Fix typo on hist__entry_add_pair Namhyung Kim
2012-11-29 14:33 ` Jiri Olsa
2012-11-29 6:38 ` [PATCH 06/18] perf hists: Link hist entry pairs to leader Namhyung Kim
2013-01-24 18:47 ` [tip:perf/core] " tip-bot for Namhyung Kim
2012-11-29 6:38 ` [PATCH 07/18] perf hists: Exchange order of comparing items when collapsing hists Namhyung Kim
2012-11-29 18:52 ` Arnaldo Carvalho de Melo
2012-12-03 1:41 ` Namhyung Kim
2012-12-03 10:19 ` Jiri Olsa
2012-12-03 10:49 ` Namhyung Kim
2012-11-29 6:38 ` [PATCH 08/18] perf hists: Add hists__{match,link}_collapsed Namhyung Kim
2012-11-29 6:38 ` [PATCH 09/18] perf symbol: Introduce symbol_conf.event_group Namhyung Kim
2012-11-29 6:38 ` [PATCH 10/18] perf report: Make another loop for linking group hists Namhyung Kim
2012-11-29 6:38 ` [PATCH 11/18] perf hists: Resort hist entries using group members for output Namhyung Kim
2012-11-29 6:38 ` [PATCH 12/18] perf ui/hist: Add support for event group view Namhyung Kim
[not found] ` <20121130132943.GC1080@krava.brq.redhat.com>
2012-11-30 13:52 ` Arnaldo Carvalho de Melo
2012-12-03 1:51 ` Namhyung Kim
2012-12-04 9:16 ` Namhyung Kim
2012-12-04 13:50 ` Arnaldo Carvalho de Melo
2012-12-04 14:51 ` Namhyung Kim
2012-12-03 1:56 ` Namhyung Kim
2012-12-03 10:23 ` Jiri Olsa
2012-12-03 10:39 ` Namhyung Kim [this message]
2012-12-03 15:57 ` Jiri Olsa
2012-12-03 16:19 ` Namhyung Kim
2012-11-29 6:38 ` [PATCH 13/18] perf hist browser: " Namhyung Kim
2012-11-29 6:38 ` [PATCH 14/18] perf gtk/browser: " Namhyung Kim
2012-11-29 6:38 ` [PATCH 15/18] perf report: Bypass non-leader events when event group is enabled Namhyung Kim
2012-11-29 6:38 ` [PATCH 16/18] perf report: Show group description " Namhyung Kim
2012-11-29 6:38 ` [PATCH 17/18] perf report: Add --group option Namhyung Kim
2012-11-29 6:38 ` [PATCH 18/18] perf report: Add report.group config option Namhyung Kim
2012-11-29 6:44 ` [PATCH 00/18] perf report: Add support for event group view (v6) Namhyung Kim
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