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Arnaldo Carvalho de Melo
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 <[email protected]> Cc: Adrian Hunter <[email protected]> Cc: Borislav Petkov <[email protected]> Cc: David Ahern <[email protected]> Cc: Frederic Weisbecker <[email protected]> Cc: Jiri Olsa <[email protected]> Cc: Kan Liang <[email protected]> Cc: Namhyung Kim <[email protected]> Cc: Stephane Eranian <[email protected]> Cc: Wang Nan <[email protected]> Link: http://lkml.kernel.org/n/[email protected] Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>
19 lines
351 B
C
19 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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