tools lib api cpu: Introduce cpu.[ch] to obtain cpu related information
authorArnaldo Carvalho de Melo <acme@redhat.com>
Thu, 10 Sep 2015 15:20:14 +0000 (12:20 -0300)
committerArnaldo Carvalho de Melo <acme@redhat.com>
Mon, 14 Sep 2015 15:50:26 +0000 (12:50 -0300)
commit09f6acf2eacad3a0f9a4b9f77e0b021f0cb45780
tree20a9c7c055687daac544429dffb932629609dfcb
parent2d729f6a8ac3edbf68de7239fab96c9736946af5
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@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>
tools/lib/api/Build
tools/lib/api/cpu.c [new file with mode: 0644]
tools/lib/api/cpu.h [new file with mode: 0644]