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    SubjectRe: [linux-pm] [RFC PATCH] thermal: Add support to report cooling statistics achieved by cooling devices
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    On 6 February 2012 09:03, Greg KH <greg@kroah.com> wrote:
    > On Mon, Feb 06, 2012 at 05:56:58PM +0100, Pavel Machek wrote:
    >> Hi!
    >>
    >> > Add a sysfs node code to report effective cooling of all cooling devices
    >> > attached to each trip points of a thermal zone. The cooling data reported
    >> > will be absolute if the higher temperature trip points are arranged first
    >> > otherwise the cooling stats is the cumulative effect of the earlier
    >> > invoked cooling handlers.
    >> >
    >> > The basic assumption is that cooling devices will bring down the temperature
    >> > in a symmetric manner and those statistics can be stored back and used for
    >> > further tuning of the system.
    >>
    >> /sys fs should be one-value-per-file, talk to gregkh.
    >
    > That's correct.
    >
    > Why not use debugfs for this instead?
    >
    > thanks,
    >
    > greg k-h

    Thanks Greg/Pavel for looking into the patch.
    Basically I checked the places where single sysfs entry is showing
    more then 1 output. And
    1) /sys/devices/system/cpu/cpu0/cpufreq/stats/time_in_state
    2) /sys/devices/system/cpu/cpu0/cpufreq/stats/trans_table
    are the places where the output is more than 1 value.

    Anyway I can enclose this sysfs inside CONFIG_THERMAL_COOLING_STATS macro.

    Thanks,
    Amit Daniel


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