linux-kernel - Re: [PATCH] perf annotate: Support to display the LBR data in tui mode

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Date:   Mon, 26 Feb 2018 10:57:16 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     "Jin, Yao" <yao.jin@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>, jolsa@...nel.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] perf annotate: Support to display the LBR data in tui
 mode

Em Sat, Feb 24, 2018 at 09:40:02AM +0800, Jin, Yao escreveu:
> 
> 
> On 2/23/2018 11:29 PM, Arnaldo Carvalho de Melo wrote:
> > Em Fri, Feb 23, 2018 at 09:25:00AM +0100, Peter Zijlstra escreveu:
> > > On Fri, Feb 23, 2018 at 10:35:58PM +0800, Jin Yao wrote:
> > > > Unlike the perf report interactive annotate mode, the perf annotate
> > > > doesn't display the LBR data.
> > 
> > > > perf record -b ...
> > > > perf annotate function
> > 
> > > > It should show IPC/cycle, but it doesn't.
> > 
> > > There is far more than IPC/cycle for the LBR data, so this Changelog is
> > > misleading.
> > 
> > > Also, I think that this patch goes the wrong way, we should reduce the
> > > divergence of the various modes, not make it worse.
> > 
> > Right, Peter, what would you think if I made --stdio use the same
> > routines used to format the TUI, i.e. stdio would be equal to the TUI
> > modulo de navigation/jump arrows, etc.
> > 
> > We would have switches to provide the TUI output options that make sense
> > for non-interactive mode, like:
> > 
> >    J   Toggle showing number of jump sources on targets
> >    o   Toggle disassembler output/simplified view
> >    s   Toggle source code view
> >    t   Circulate percent, total period, samples view
> >    k   Toggle line numbers
> > 
> 
> Hi Arnaldo, looks your idea is very similar as my idea. In my understanding,
> for example, we may provide switch to tui routine like
> annotate_browser__write() and use fprintf() to replace
> ui_browser__printf()/ui_browser_write__xxx() if switch is on for stdio.
> 
> Is that your idea?

Yes, right now the TUI simply uses foo__scnprintf() routines to then
pass formatted buffers to the TUI routines, we would then just pass them
to plain fprintf(sdtout).
 
> For this approach, I think, the benefit is we can reuse most of existing
> code but the disadvantage is we have to mix tui and stdio up.

- Arnaldo