linux-kernel - Re: [PATCH v3 0/2] perf report: Implement visual marker for macro fusion in annotate

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Date:   Thu, 6 Jul 2017 08:42:54 +0800
From:   "Jin, Yao" <yao.jin@...ux.intel.com>
To:     acme@...nel.org, jolsa@...nel.org, peterz@...radead.org,
        mingo@...hat.com, alexander.shishkin@...ux.intel.com
Cc:     Linux-kernel@...r.kernel.org, ak@...ux.intel.com,
        kan.liang@...el.com, yao.jin@...el.com
Subject: Re: [PATCH v3 0/2] perf report: Implement visual marker for macro
 fusion in annotate

Hi Arnaldo,

Is this series OK?

Thanks

Jin Yao


On 6/20/2017 8:22 PM, Jin Yao wrote:
> Macro fusion merges two instructions to a single micro-op. Intel
> core platform performs this hardware optimization under limited
> circumstances. For example, CMP + JCC can be "fused" and executed
> /retired together. While with sampling this can result in the
> sample sometimes being on the JCC and sometimes on the CMP.
> So for the fused instruction pair, they could be considered
> together.
>
> On Nehalem, fused instruction pairs:
> cmp/test + jcc.
>
> On other new CPU:
> cmp/test/add/sub/and/inc/dec + jcc.
>
> This patch series marks the case clearly by joining the fused
> instruction pair in the arrow of the jump.
>
> For example:
>
>         │   ┌──cmpl   $0x0,argp_program_version_hook
>   81.93 │   ├──je     20
>         │   │  lock   cmpxchg %esi,0x38a9a4(%rip)
>         │   │↓ jne    29
>         │   │↓ jmp    43
>   11.47 │20:└─→cmpxch %esi,0x38a999(%rip)
>
> Change-log:
> -----------
> v3: 1.  Add checking for Nehalem (CMP, TEST). For other newer
>          Intel CPUs just check it by default (CMP, TEST, ADD,
>          SUB, AND, INC, DEC).
>
>      2.  Use Arnaldo's fix to let the display be better
>
> v2: According to Arnaldo's comments, remove the weak function and
>      use an arch-specific function instead to check fused instruction
>      pair.
>
> v1: Inital post
>
> Jin Yao (2):
>    perf util: Check for fused instruction
>    perf report: Implement visual marker for macro fusion in annotate
>
>   tools/perf/arch/x86/annotate/instructions.c | 37 +++++++++++++++++++++++++++++
>   tools/perf/ui/browser.c                     | 29 ++++++++++++++++++++++
>   tools/perf/ui/browser.h                     |  2 ++
>   tools/perf/ui/browsers/annotate.c           | 32 +++++++++++++++++++++++++
>   tools/perf/util/annotate.c                  | 17 +++++++++++++
>   tools/perf/util/annotate.h                  |  3 +++
>   6 files changed, 120 insertions(+)
>