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Subject[PATCH] perf top: Display the LBR stats in callchain entry
Date
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;
--
2.7.4
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