From: Jin Yao <yao.jin@linux.intel.com>
To: acme@kernel.org, jolsa@kernel.org, peterz@infradead.org,
mingo@redhat.com, alexander.shishkin@linux.intel.com
Cc: Linux-kernel@vger.kernel.org, ak@linux.intel.com,
kan.liang@intel.com, yao.jin@intel.com,
Jin Yao <yao.jin@linux.intel.com>
Subject: [PATCH] perf top: Display the LBR stats in callchain entry
Date: Wed, 31 Oct 2018 19:06:35 +0800 [thread overview]
Message-ID: <1540983995-20462-1-git-send-email-yao.jin@linux.intel.com> (raw)
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
next reply other threads:[~2018-10-31 3:17 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-10-31 11:06 Jin Yao [this message]
2018-11-05 0:31 ` [PATCH] perf top: Display the LBR stats in callchain entry Jin, Yao
2018-11-05 13:10 ` Arnaldo Carvalho de Melo
2018-11-05 17:23 ` Arnaldo Carvalho de Melo
2018-11-06 19:14 ` [tip:perf/urgent] " tip-bot for Jin Yao
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