Hi,
I tried to use cpufreq_stats to do some performance anlaysis but I
did not see cpufreq_stats entries under sysfs on my Linux machine. I
am wondering if anyone can help me point out what could be the
problem.
Here are more detailed info
1). My kernel version is: 3.0.1
2). cpufreq and cpufreq_stats has been built into the kernel
image rather than as a separate, standalone kernel modules.
3). I can see cpufreq related sysfs entries under:
/sys/devices/system/cpu/cpufreq and
/sys/devices/system/cpu/cpu0/cpufreq.
4). But when I looked under above two directories, I did not
see cpufreq_stats related entries.
Also, when I looked at the code of the cpufreq_stats.c, I see the
logics like this:
--> cpufreq_stats sysfs is only created inside
cpufreq_stats_create_table()
--> cpufreq_stats_create_table() is either invoked inside
cpufreq_stat_notifier_policy() or cpufreq_stats_create_table_cpu().
--> cpufreq_stats_create_table_cpu() is only invoked if a CPU
is CPU_DOWN_FAILED or CPU_DOWN_FAILED_FROZEN which will not happen in
my environment.
--> And, cpufreq_stats_init() will unregister
CPUFREQ_POLICY_NOTIFIER if registering of CPUFREQ_TRANSITION_NOTIFIER
is successful.
So, cpufreq_stats sysfs entries will not exist? I am sure I
have mis-read the code somehow.
Really appreciate your help.
Lei Yu
P.S. I am new to Linux kernel mailing list, if I am not following any
of the style, pls do let me know.
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