Commit-ID: 09f6acf2eacad3a0f9a4b9f77e0b021f0cb45780
Gitweb: http://git.kernel.org/tip/09f6acf2eacad3a0f9a4b9f77e0b021f0cb45780
Author: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
AuthorDate: Thu, 10 Sep 2015 12:20:14 -0300
Committer: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
CommitDate: Mon, 14 Sep 2015 12:50:26 -0300
tools lib api cpu: Introduce cpu.[ch] to obtain cpu related information
E.g.:
$ ./cpu__get_max_freq
3200000
It does that, as Kan's patch does, by looking at these files:
$ cat /sys/devices/system/cpu/online
0-3
$ ./sysfs__read_ull
devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq
/sys/devices/system/cpu/cpu0/cpufreq/cpuinfo_max_freq=3200000
$
I.e. find out the first online CPU, then read its cpufreq info.
But do it in tools/lib/api/, so that other tools/ living code can use
it, not just perf.
Based-on-a-patch-by: Kan Liang <kan.liang@xxxxxxxxx>
Cc: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxx>
Cc: David Ahern <dsahern@xxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Kan Liang <kan.liang@xxxxxxxxx>
Cc: Namhyung Kim <namhyung@xxxxxxxxxx>
Cc: Stephane Eranian <eranian@xxxxxxxxxx>
Cc: Wang Nan <wangnan0@xxxxxxxxxx>
Link: http://lkml.kernel.org/n/tip-915v4cvxqplaub8qco66b9mv@xxxxxxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/lib/api/Build | 1 +
tools/lib/api/cpu.c | 18 ++++++++++++++++++
tools/lib/api/cpu.h | 6 ++++++
3 files changed, 25 insertions(+)
diff --git a/tools/lib/api/Build b/tools/lib/api/Build
index 3653965..e8b8a23 100644
--- a/tools/lib/api/Build
+++ b/tools/lib/api/Build
@@ -1,2 +1,3 @@
libapi-y += fd/
libapi-y += fs/
+libapi-y += cpu.o
diff --git a/tools/lib/api/cpu.c b/tools/lib/api/cpu.c
new file mode 100644
index 0000000..8c64893
--- /dev/null
+++ b/tools/lib/api/cpu.c
@@ -0,0 +1,18 @@
+#include <stdio.h>
+
+#include "cpu.h"
+#include "fs/fs.h"
+
+int cpu__get_max_freq(unsigned long long *freq)
+{
+ char entry[PATH_MAX];
+ int cpu;
+
+ if (sysfs__read_int("devices/system/cpu/online", &cpu) < 0)
+ return -1;
+
+ snprintf(entry, sizeof(entry),
+ "devices/system/cpu/cpu%d/cpufreq/cpuinfo_max_freq", cpu);
+
+ return sysfs__read_ull(entry, freq);
+}
diff --git a/tools/lib/api/cpu.h b/tools/lib/api/cpu.h
new file mode 100644
index 0000000..81e9d39
--- /dev/null
+++ b/tools/lib/api/cpu.h
@@ -0,0 +1,6 @@
+#ifndef __API_CPU__
+#define __API_CPU__
+
+int cpu__get_max_freq(unsigned long long *freq);
+
+#endif /* __API_CPU__ */
--
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