Re: [PATCH] perf tests: Make leader sampling test work without branch event

[Ian Rogers]

On Sat, Nov 16, 2024 at 11:28 AM Arnaldo Carvalho de Melo
<acme@xxxxxxxxxx> wrote:
>
> On Fri, Nov 15, 2024 at 10:54:43AM -0800, Ian Rogers wrote:
> > On Fri, Nov 15, 2024 at 8:16 AM James Clark <james.clark@xxxxxxxxxx> wrote:
> > >
> > > Arm a57 only has speculative branch events so this test fails there. The
> > > test doesn't depend on branch instructions so change it to instructions
> > > which is pretty much guaranteed to be everywhere. The
> > > test_branch_counter() test above already tests for the existence of the
> > > branches event and skips if its not present.
> > >
> > > Signed-off-by: James Clark <james.clark@xxxxxxxxxx>
> >
> > Reviewed-by: Ian Rogers <irogers@xxxxxxxxxx>
>
> Thanks, applied to perf-tools-next,

Rebasing on perf-tools-next I see this failing on my Intel Tigerlake
laptop. An example script output for:
```
 perf record -o "${perfdata}" -e "{instructions,instructions}:Su"
```
is:
```
            perf  352917 49604.160314:          3 instructions:
7f155caca323 [unknown]
(/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
            perf  352917 49604.160314:          3 instructions:
7f155caca323 [unknown]
(/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
            perf  352917 49604.160317:         18 instructions:
7f155cacaf3d _dl_start+0x3d
(/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
            perf  352917 49604.160317:         18 instructions:
7f155cacaf3d _dl_start+0x3d
(/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
            perf  352917 49604.160319:          3 instructions:
7f155cacaf44 _dl_start+0x44
(/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
            perf  352917 49604.160319:          3 instructions:
7f155cacaf44 _dl_start+0x44
(/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
            perf  352917 49604.161099:        120 instructions:
ffffffff8ce00080 [unknown] ([unknown])
            perf  352917 49604.161099:     181013 instructions:
ffffffff8ce00080 [unknown] ([unknown])
            perf  352917 49604.161115:       8811 instructions:
7f155cad22d0 strcmp+0x8b0
(/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
            perf  352917 49604.161115:       8811 instructions:
7f155cad22d0 strcmp+0x8b0
(/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
            perf  352917 49604.161130:      10483 instructions:
7f155caba508 _dl_new_object+0x198
(/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
            perf  352917 49604.161130:      10483 instructions:
7f155caba508 _dl_new_object+0x198
(/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
            perf  352917 49604.165156:     177355 instructions:
7f155cab90a4 _dl_lookup_symbol_x+0x44
(/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
            perf  352917 49604.165156:   13313598 instructions:
7f155cab90a4 _dl_lookup_symbol_x+0x44
(/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2)
...
```

Dapeng/Kan, any thoughts why the counts don't match for instructions
but did for branches?

Thanks,
Ian