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SubjectRe: [PATCH] perf top: Display the LBR stats in callchain entry
Em Mon, Nov 05, 2018 at 08:31:59AM +0800, Jin, Yao escreveu:
> Hi,
>
> Any comments for this patch?

I'll check it today, I'm just a bit behind while preparing for plumbers,
I'll get to all the patches :-)

- Arnaldo

> Thanks
> Jin Yao
>
> On 10/31/2018 7:06 PM, Jin Yao wrote:
> > Perf report has supported the displaying of LBR stats
> > (such as cycles, predicted%) in callchain entry.
> >
> > For example,
> > perf report --branch-history --stdio
> >
> > --1.01%--intel_idle mwait.h:29
> > intel_idle cpufeature.h:164 (cycles:5)
> > intel_idle cpufeature.h:164 (predicted:76.4%)
> > intel_idle mwait.h:102 (cycles:41)
> > intel_idle current.h:15
> >
> > While perf top has not supported that.
> >
> > For example,
> > perf top -a -b --call-graph branch
> >
> > - 13.86% 0.23% [kernel] [k] __x86_indirect_thunk_rax
> > - 13.65% __x86_indirect_thunk_rax
> > + 1.69% do_syscall_64
> > + 1.68% do_select
> > + 1.41% ktime_get
> > + 0.70% __schedule
> > + 0.62% do_sys_poll
> > 0.58% __x86_indirect_thunk_rax
> >
> > Actually it's very easy to enable this feature in perf top.
> >
> > With this patch, the result is:
> >
> > perf top -a -b --call-graph branch
> >
> > - 13.58% 0.00% [kernel] [k] __x86_indirect_thunk_rax
> > - 13.57% __x86_indirect_thunk_rax (predicted:93.9%)
> > + 1.78% do_select (cycles:2)
> > + 1.68% perf_pmu_disable.part.99 (cycles:1)
> > + 1.45% ___sys_recvmsg (cycles:25)
> > + 0.81% unix_stream_sendmsg (cycles:18)
> > + 0.80% ktime_get (cycles:400)
> > 0.58% pick_next_task_fair (cycles:47)
> > + 0.56% i915_request_retire (cycles:2)
> > + 0.52% do_sys_poll (cycles:4)
> >
> > Signed-off-by: Jin Yao <yao.jin@linux.intel.com>
> > ---
> > tools/perf/builtin-top.c | 3 +++
> > 1 file changed, 3 insertions(+)
> >
> > diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> > index d21d875..7691b21 100644
> > --- a/tools/perf/builtin-top.c
> > +++ b/tools/perf/builtin-top.c
> > @@ -1420,6 +1420,9 @@ int cmd_top(int argc, const char **argv)
> > }
> > }
> > + if (opts->branch_stack && callchain_param.enabled)
> > + symbol_conf.show_branchflag_count = true;
> > +
> > sort__mode = SORT_MODE__TOP;
> > /* display thread wants entries to be collapsed in a different tree */
> > perf_hpp_list.need_collapse = 1;
> >

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