mirror of
https://github.com/torvalds/linux.git
synced 2024-12-27 05:11:48 +00:00
09f6acf2ea
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@intel.com> Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Borislav Petkov <bp@suse.de> Cc: David Ahern <dsahern@gmail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Kan Liang <kan.liang@intel.com> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Stephane Eranian <eranian@google.com> Cc: Wang Nan <wangnan0@huawei.com> Link: http://lkml.kernel.org/n/tip-915v4cvxqplaub8qco66b9mv@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
19 lines
351 B
C
19 lines
351 B
C
#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);
|
|
}
|