linux-kernel - Re: [PATCH v3] perf annotate/report: Remove hist__account

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Date:   Wed, 10 Apr 2019 10:00:10 -0300
From:   Arnaldo Carvalho de Melo <arnaldo.melo@...il.com>
To:     Jin Yao <yao.jin@...ux.intel.com>
Cc:     jolsa@...nel.org, peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, Linux-kernel@...r.kernel.org,
        ak@...ux.intel.com, kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v3] perf annotate/report: Remove hist__account_cycles
 from callback

Em Sat, Mar 16, 2019 at 05:16:17AM +0800, Jin Yao escreveu:
> The hist__account_cycles is executed when the hist_iter__branch_callback
> is called. But it looks it's not necessary. In hist__account_cycles, it
> already walks on all branch entries.
> 
> This patch moves the hist__account_cycles out of callback, now the data
> processing is much faster than before.
> 
> Previous code has an issue that the ch[offset].num++
> (in __symbol__account_cycles) is executed repeatedly since
> hist__account_cycles is called in each hist_iter__branch_callback,
> so the counting of ch[offset].num is not correct (too big).
> With this patch, the issue is fixed. And we don't need the code of
> "ch->reset >= ch->num / 2" to check if there are too many overlaps
> (in annotation__count_and_fill), otherwise some data would be
> hidden.
> 
> Now, we can try, for example:

Tested with:

  perf annotate --stdio
  perf annotate --stdio2
  perf annotate --tui
  perf report --tui -> press annotation hotkey 'a'

Applied,

- Arnaldo