linux-kernel - [PATCH 1/1] perf,tools: store cpu->socket and cpu->core in perf_session

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Message-Id: <1440674735-13373-1-git-send-email-kan.liang@intel.com>
Date:	Thu, 27 Aug 2015 07:25:35 -0400
From:	kan.liang@...el.com
To:	acme@...nel.org, jolsa@...nel.org
Cc:	ak@...ux.intel.com, linux-kernel@...r.kernel.org,
	Kan Liang <kan.liang@...el.com>
Subject: [PATCH 1/1] perf,tools: store cpu->socket and cpu->core in perf_session_env

From: Kan Liang <kan.liang@...el.com>

This patch parse cpu_topology from perf.data, and store cpu's socket id
and core id information in perf_session_env.

Signed-off-by: Kan Liang <kan.liang@...el.com>
---
 tools/perf/util/header.c  | 27 ++++++++++++++++++++++++++-
 tools/perf/util/header.h  |  6 ++++++
 tools/perf/util/session.c |  1 +
 3 files changed, 33 insertions(+), 1 deletion(-)

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 179b2bd..9308340 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -1590,10 +1590,17 @@ static int process_cpu_topology(struct perf_file_section *section __maybe_unused
 	u32 nr, i;
 	char *str;
 	struct strbuf sb;
+	int cpu_nr = ph->env.nr_cpus_online;
+	struct cpu_map *map;
+	int j;
+
+	ph->env.cpu = calloc(cpu_nr, sizeof(*ph->env.cpu));
+	if (!ph->env.cpu)
+		return -1;
 
 	ret = readn(fd, &nr, sizeof(nr));
 	if (ret != sizeof(nr))
-		return -1;
+		goto free_cpu;
 
 	if (ph->needs_swap)
 		nr = bswap_32(nr);
@@ -1608,6 +1615,14 @@ static int process_cpu_topology(struct perf_file_section *section __maybe_unused
 
 		/* include a NULL character at the end */
 		strbuf_add(&sb, str, strlen(str) + 1);
+
+		map = cpu_map__new(str);
+		if (!map)
+			goto error;
+		for (j = 0; j < map->nr; j++) {
+			 ph->env.cpu[map->map[j]].socket_id = i;
+		}
+		cpu_map__put(map);
 		free(str);
 	}
 	ph->env.sibling_cores = strbuf_detach(&sb, NULL);
@@ -1628,6 +1643,14 @@ static int process_cpu_topology(struct perf_file_section *section __maybe_unused
 
 		/* include a NULL character at the end */
 		strbuf_add(&sb, str, strlen(str) + 1);
+
+		map = cpu_map__new(str);
+		if (!map)
+			goto error;
+		for (j = 0; j < map->nr; j++) {
+			ph->env.cpu[map->map[j]].core_id = i;
+		}
+		cpu_map__put(map);
 		free(str);
 	}
 	ph->env.sibling_threads = strbuf_detach(&sb, NULL);
@@ -1635,6 +1658,8 @@ static int process_cpu_topology(struct perf_file_section *section __maybe_unused
 
 error:
 	strbuf_release(&sb);
+free_cpu:
+	free(ph->env.cpu);
 	return -1;
 }
 
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index 9b53b65..8b8c4fc 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -66,6 +66,11 @@ struct perf_header;
 int perf_file_header__read(struct perf_file_header *header,
 			   struct perf_header *ph, int fd);
 
+struct cpu_topology_map {
+	int	socket_id;
+	int	core_id;
+};
+
 struct perf_session_env {
 	char			*hostname;
 	char			*os_release;
@@ -89,6 +94,7 @@ struct perf_session_env {
 	char			*sibling_threads;
 	char			*numa_nodes;
 	char			*pmu_mappings;
+	struct cpu_topology_map	*cpu;
 };
 
 struct perf_header {
diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
index 18722e7..51b4d5a 100644
--- a/tools/perf/util/session.c
+++ b/tools/perf/util/session.c
@@ -185,6 +185,7 @@ static void perf_session_env__exit(struct perf_session_env *env)
 	zfree(&env->sibling_threads);
 	zfree(&env->numa_nodes);
 	zfree(&env->pmu_mappings);
+	zfree(&env->cpu);
 }
 
 void perf_session__delete(struct perf_session *session)
-- 
1.8.3.1

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