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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>
18 lines
351 B
C
18 lines
351 B
C
#include <stdio.h>
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#include "cpu.h"
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#include "fs/fs.h"
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int cpu__get_max_freq(unsigned long long *freq)
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{
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char entry[PATH_MAX];
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int cpu;
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if (sysfs__read_int("devices/system/cpu/online", &cpu) < 0)
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return -1;
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snprintf(entry, sizeof(entry),
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"devices/system/cpu/cpu%d/cpufreq/cpuinfo_max_freq", cpu);
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return sysfs__read_ull(entry, freq);
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}
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