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Date: Fri, 24 Jul 2015 09:48:27 -0400
From: kan.liang@...el.com
To: a.p.zijlstra@...llo.nl, acme@...nel.org
Cc: luto@...nel.org, mingo@...hat.com, eranian@...gle.com,
ak@...ux.intel.com, mark.rutland@....com, adrian.hunter@...el.com,
jolsa@...nel.org, namhyung@...nel.org,
linux-kernel@...r.kernel.org, Kan Liang <kan.liang@...el.com>
Subject: [PATCH V2 1/6] perf,tools: save cpu max freq in perf header
From: Kan Liang <kan.liang@...el.com>
Get cpu max frequency from the first online cpu, and save the MHz value
in perf.data header.
Signed-off-by: Kan Liang <kan.liang@...el.com>
---
tools/perf/util/cpumap.c | 32 ++++++++++++++++++++++++++++++++
tools/perf/util/cpumap.h | 1 +
tools/perf/util/header.c | 35 +++++++++++++++++++++++++++++++++++
tools/perf/util/header.h | 2 ++
4 files changed, 70 insertions(+)
diff --git a/tools/perf/util/cpumap.c b/tools/perf/util/cpumap.c
index 3667e21..548ef13 100644
--- a/tools/perf/util/cpumap.c
+++ b/tools/perf/util/cpumap.c
@@ -499,3 +499,35 @@ int cpu__setup_cpunode_map(void)
closedir(dir1);
return 0;
}
+
+unsigned int get_cpu_max_freq(void)
+{
+ const char *mnt;
+ char path[PATH_MAX], tmp;
+ FILE *fp;
+ unsigned int freq;
+ int cpu = 0;
+ int ret;
+
+ mnt = sysfs__mountpoint();
+ if (!mnt)
+ return 0;
+
+ snprintf(path, PATH_MAX, "%s/devices/system/cpu/online", mnt);
+ fp = fopen(path, "r");
+ if (fp) {
+ ret = fscanf(fp, "%u%c", &cpu, &tmp);
+ fclose(fp);
+ if (ret < 1)
+ return 0;
+ }
+
+ snprintf(path, PATH_MAX, "%s/devices/system/cpu/cpu%d/cpufreq/cpuinfo_max_freq", mnt, cpu);
+ fp = fopen(path, "r");
+ if (!fp)
+ return 0;
+ ret = fscanf(fp, "%u", &freq);
+ fclose(fp);
+
+ return (ret == 1) ? freq : 0;
+}
diff --git a/tools/perf/util/cpumap.h b/tools/perf/util/cpumap.h
index 0af9cec..6784677 100644
--- a/tools/perf/util/cpumap.h
+++ b/tools/perf/util/cpumap.h
@@ -58,6 +58,7 @@ int max_node_num;
int *cpunode_map;
int cpu__setup_cpunode_map(void);
+unsigned int get_cpu_max_freq(void);
static inline int cpu__max_node(void)
{
diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 03ace57..287a488 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -862,6 +862,16 @@ write_it:
return do_write_string(fd, buffer);
}
+static int write_cpu_max_freq(int fd, struct perf_header *h __maybe_unused,
+ struct perf_evlist *evlist __maybe_unused)
+{
+ u32 freq;
+
+ freq = get_cpu_max_freq() / 1000;
+
+ return do_write(fd, &freq, sizeof(freq));
+}
+
static int write_branch_stack(int fd __maybe_unused,
struct perf_header *h __maybe_unused,
struct perf_evlist *evlist __maybe_unused)
@@ -1158,6 +1168,11 @@ static void print_cpuid(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
fprintf(fp, "# cpuid : %s\n", ph->env.cpuid);
}
+static void print_cpu_max_freq(struct perf_header *ph, int fd __maybe_unused, FILE *fp)
+{
+ fprintf(fp, "# CPU max frequency : %u MHz\n", ph->env.cpu_max_freq);
+}
+
static void print_branch_stack(struct perf_header *ph __maybe_unused,
int fd __maybe_unused, FILE *fp)
{
@@ -1471,6 +1486,25 @@ static int process_cpuid(struct perf_file_section *section __maybe_unused,
return ph->env.cpuid ? 0 : -ENOMEM;
}
+static int process_cpu_max_freq(struct perf_file_section *section __maybe_unused,
+ struct perf_header *ph, int fd,
+ void *data __maybe_unused)
+{
+ ssize_t ret;
+ u32 nr;
+
+ ret = readn(fd, &nr, sizeof(nr));
+ if (ret != sizeof(nr))
+ return -1;
+
+ if (ph->needs_swap)
+ nr = bswap_32(nr);
+
+ ph->env.cpu_max_freq = nr;
+
+ return 0;
+}
+
static int process_total_mem(struct perf_file_section *section __maybe_unused,
struct perf_header *ph, int fd,
void *data __maybe_unused)
@@ -1885,6 +1919,7 @@ static const struct feature_ops feat_ops[HEADER_LAST_FEATURE] = {
FEAT_OPP(HEADER_NRCPUS, nrcpus),
FEAT_OPP(HEADER_CPUDESC, cpudesc),
FEAT_OPP(HEADER_CPUID, cpuid),
+ FEAT_OPP(HEADER_CPU_MAX_FREQ, cpu_max_freq),
FEAT_OPP(HEADER_TOTAL_MEM, total_mem),
FEAT_OPP(HEADER_EVENT_DESC, event_desc),
FEAT_OPP(HEADER_CMDLINE, cmdline),
diff --git a/tools/perf/util/header.h b/tools/perf/util/header.h
index d4d5796..a646025 100644
--- a/tools/perf/util/header.h
+++ b/tools/perf/util/header.h
@@ -22,6 +22,7 @@ enum {
HEADER_NRCPUS,
HEADER_CPUDESC,
HEADER_CPUID,
+ HEADER_CPU_MAX_FREQ,
HEADER_TOTAL_MEM,
HEADER_CMDLINE,
HEADER_EVENT_DESC,
@@ -75,6 +76,7 @@ struct perf_session_env {
int nr_cpus_avail;
char *cpu_desc;
char *cpuid;
+ int cpu_max_freq;
unsigned long long total_mem;
int nr_cmdline;
--
1.8.3.1
--
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