linux-kernel - Re: [PATCH] perf report: Fix wrong jump arrow

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Message-ID: <20180209151549.GL3451@kernel.org>
Date:   Fri, 9 Feb 2018 12:15:49 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
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] perf report: Fix wrong jump arrow

Em Mon, Jan 29, 2018 at 06:57:53PM +0800, Jin Yao escreveu:
> When we use perf report interactive annotate view, we can see
> the position of jump arrow is not correct. For example,
> 
> 1. perf record -b ...
> 2. perf report
> 3. In interactive mode, select Annotate 'function'
> 
> Percent│ IPC Cycle
>        │                                if (flag)
>   1.37 │0.4┌──   1      ↓ je     82
>        │   │                                    x += x / y + y / x;

Applied and added this to the cset log, please check:

Committer notes:

Please note that only from LBRv5 (according to Jiri) onwards, i.e. >=
Skylake is that we'll have the cycles counts in each branch record
entry, so to see the Cycles and IPC columns, and be able to test this
patch, one need a capable hardware.

While applying this I first tested it on a Broadwell class machine and
couldn't get those columns, will add code to the annotate browser to
warn the user about that, i.e. you have branch records, but no cycles,
use a more recent hardware to get the cycles and IPC columns.

- Arnaldo