linux-kernel - [PATCH v1 0/2] perf report: Implement visual marker for macro fusion in annotate

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Date:   Wed, 14 Jun 2017 10:53:39 +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,
        Jin Yao <yao.jin@...ux.intel.com>
Subject: [PATCH v1 0/2] perf report: Implement visual marker for macro fusion in annotate

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.

In general, the fused instruction pairs are:

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)

Jin Yao (2):
  perf report: Check for fused instruction pair
  perf report: Implement visual marker for macro fusion in annotate

 tools/perf/arch/x86/util/Build    |  1 +
 tools/perf/arch/x86/util/fused.c  | 20 ++++++++++++++++++++
 tools/perf/ui/browser.c           | 27 +++++++++++++++++++++++++++
 tools/perf/ui/browser.h           |  2 ++
 tools/perf/ui/browsers/annotate.c | 30 ++++++++++++++++++++++++++++++
 tools/perf/util/Build             |  1 +
 tools/perf/util/annotate.c        |  5 +++++
 tools/perf/util/annotate.h        |  1 +
 tools/perf/util/fused.c           | 11 +++++++++++
 tools/perf/util/fused.h           |  8 ++++++++
 10 files changed, 106 insertions(+)
 create mode 100644 tools/perf/arch/x86/util/fused.c
 create mode 100644 tools/perf/util/fused.c
 create mode 100644 tools/perf/util/fused.h

-- 
2.7.4