linux-kernel - [PATCH] perf tools: apply correct label to user/kernel symbols in branch mode

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Date:   Wed, 26 Jan 2022 10:59:26 +0000
From:   German Gomez <german.gomez@....com>
To:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        acme@...nel.org
Cc:     German Gomez <german.gomez@....com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>
Subject: [PATCH] perf tools: apply correct label to user/kernel symbols in branch mode

In branch mode, the branch symbols were being displayed with incorrect
cpumode labels. So fix this.

For example, before:
  # perf record -b -a -- sleep 1
  # perf report -b

  Overhead  Command  Source Shared Object  Source Symbol               Target Symbol
     0.08%  swapper  [kernel.kallsyms]     [k] rcu_idle_enter          [k] cpuidle_enter_state
 ==> 0.08%  cmd0     [kernel.kallsyms]     [.] psi_group_change        [.] psi_group_change
     0.08%  cmd1     [kernel.kallsyms]     [k] psi_group_change        [k] psi_group_change

After:
  # perf report -b

  Overhead  Command  Source Shared Object  Source Symbol               Target Symbol
     0.08%  swapper  [kernel.kallsyms]     [k] rcu_idle_enter          [k] cpuidle_enter_state
     0.08%  cmd0     [kernel.kallsyms]     [k] psi_group_change        [k] pei_group_change
     0.08%  cmd1     [kernel.kallsyms]     [k] psi_group_change        [k] psi_group_change

Signed-off-by: German Gomez <german.gomez@....com>
---
 tools/perf/util/machine.c    | 2 ++
 tools/perf/util/map_symbol.h | 1 +
 tools/perf/util/sort.c       | 4 ++--
 3 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/tools/perf/util/machine.c b/tools/perf/util/machine.c
index 3901440ae..ef564a5cf 100644
--- a/tools/perf/util/machine.c
+++ b/tools/perf/util/machine.c
@@ -2072,6 +2072,7 @@ static void ip__resolve_ams(struct thread *thread,
 
 	ams->addr = ip;
 	ams->al_addr = al.addr;
+	ams->al_level = al.level;
 	ams->ms.maps = al.maps;
 	ams->ms.sym = al.sym;
 	ams->ms.map = al.map;
@@ -2091,6 +2092,7 @@ static void ip__resolve_data(struct thread *thread,
 
 	ams->addr = addr;
 	ams->al_addr = al.addr;
+	ams->al_level = al.level;
 	ams->ms.maps = al.maps;
 	ams->ms.sym = al.sym;
 	ams->ms.map = al.map;
diff --git a/tools/perf/util/map_symbol.h b/tools/perf/util/map_symbol.h
index 7d22ade08..e08817b0c 100644
--- a/tools/perf/util/map_symbol.h
+++ b/tools/perf/util/map_symbol.h
@@ -18,6 +18,7 @@ struct addr_map_symbol {
 	struct map_symbol ms;
 	u64	      addr;
 	u64	      al_addr;
+	char	      al_level;
 	u64	      phys_addr;
 	u64	      data_page_size;
 };
diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
index cfba8c337..2da081ef5 100644
--- a/tools/perf/util/sort.c
+++ b/tools/perf/util/sort.c
@@ -915,7 +915,7 @@ static int hist_entry__sym_from_snprintf(struct hist_entry *he, char *bf,
 		struct addr_map_symbol *from = &he->branch_info->from;
 
 		return _hist_entry__sym_snprintf(&from->ms, from->al_addr,
-						 he->level, bf, size, width);
+						 from->al_level, bf, size, width);
 	}
 
 	return repsep_snprintf(bf, size, "%-*.*s", width, width, "N/A");
@@ -928,7 +928,7 @@ static int hist_entry__sym_to_snprintf(struct hist_entry *he, char *bf,
 		struct addr_map_symbol *to = &he->branch_info->to;
 
 		return _hist_entry__sym_snprintf(&to->ms, to->al_addr,
-						 he->level, bf, size, width);
+						 to->al_level, bf, size, width);
 	}
 
 	return repsep_snprintf(bf, size, "%-*.*s", width, width, "N/A");
-- 
2.25.1