I figured out the problem, please ignore the post, Sorry for the spam. On Thu, Nov 3, 2011 at 12:29 PM, Lei Yu <y.benben.y@xxxxxxxxx> wrote: > One correction below. > > On Thu, Nov 3, 2011 at 11:55 AM, Lei Yu <y.benben.y@xxxxxxxxx> wrote: >> 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. > > Please ignore my explanation of the code above since I missed the early return. > >> >> 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. >> > -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
