perf report: Fix wrong jump arrow

[ Upstream commit b40982e8468b46b8f7f5bba5a7e541ec04a29d7d ]

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;
  0.00 │0.4│  1310        movsd  (%rsp),%xmm0
  0.00 │0.4│   565        movsd  0x8(%rsp),%xmm4
       │0.4│              movsd  0x8(%rsp),%xmm1
       │0.4│              movsd  (%rsp),%xmm3
       │0.4│              divsd  %xmm4,%xmm0
  0.00 │0.4│   579        divsd  %xmm3,%xmm1
       │0.4│              movsd  (%rsp),%xmm2
       │0.4│              addsd  %xmm1,%xmm0
       │0.4│              addsd  %xmm2,%xmm0
  0.00 │0.4│              movsd  %xmm0,(%rsp)
       │   │                    volatile double x = 1212121212, y = 121212;
       │   │
       │   │                    s_randseed = time(0);
       │   │                    srand(s_randseed);
       │   │
       │   │                    for (i = 0; i < 2000000000; i++) {
  1.37 │0.4└─→      82:   sub    $0x1,%ebx
 28.21 │0.48    17      ↑ jne    38

The jump arrow in above example is not correct. It should add the
width of IPC and Cycle.

With this patch, the result is:

Percent│ IPC Cycle
       │                                if (flag)
  1.37 │0.48     1     ┌──je     82
       │               │                        x += x / y + y / x;
  0.00 │0.48  1310     │  movsd  (%rsp),%xmm0
  0.00 │0.48   565     │  movsd  0x8(%rsp),%xmm4
       │0.48           │  movsd  0x8(%rsp),%xmm1
       │0.48           │  movsd  (%rsp),%xmm3
       │0.48           │  divsd  %xmm4,%xmm0
  0.00 │0.48   579     │  divsd  %xmm3,%xmm1
       │0.48           │  movsd  (%rsp),%xmm2
       │0.48           │  addsd  %xmm1,%xmm0
       │0.48           │  addsd  %xmm2,%xmm0
  0.00 │0.48           │  movsd  %xmm0,(%rsp)
       │               │        volatile double x = 1212121212, y = 121212;
       │               │
       │               │        s_randseed = time(0);
       │               │        srand(s_randseed);
       │               │
       │               │        for (i = 0; i < 2000000000; i++) {
  1.37 │0.48        82:└─→sub    $0x1,%ebx
 28.21 │0.48    17      ↑ jne    38

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.

Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jin Yao <yao.jin@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1517223473-14750-1-git-send-email-yao.jin@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/tools/perf/ui/browsers/annotate.c b/tools/perf/ui/browsers/annotate.c
index 8f7f59d..0c486d2 100644 (file)
--- a/tools/perf/ui/browsers/annotate.c
+++ b/tools/perf/ui/browsers/annotate.c
@@ -312,6 +312,7 @@ static void annotate_browser__draw_current_jump(struct ui_browser *browser)
        struct map_symbol *ms = ab->b.priv;
        struct symbol *sym = ms->sym;
        u8 pcnt_width = annotate_browser__pcnt_width(ab);
+       int width = 0;
 
        /* PLT symbols contain external offsets */
        if (strstr(sym->name, "@plt"))
@@ -335,13 +336,17 @@ static void annotate_browser__draw_current_jump(struct ui_browser *browser)
                to = (u64)btarget->idx;
        }
 
+       if (ab->have_cycles)
+               width = IPC_WIDTH + CYCLES_WIDTH;
+
        ui_browser__set_color(browser, HE_COLORSET_JUMP_ARROWS);
-       __ui_browser__line_arrow(browser, pcnt_width + 2 + ab->addr_width,
+       __ui_browser__line_arrow(browser,
+                                pcnt_width + 2 + ab->addr_width + width,
                                 from, to);
 
        if (is_fused(ab, cursor)) {
                ui_browser__mark_fused(browser,
-                                      pcnt_width + 3 + ab->addr_width,
+                                      pcnt_width + 3 + ab->addr_width + width,
                                       from - 1,
                                       to > from ? true : false);
        }