Easy Way To Fix Linux Kernel Can Cause Sleep Problems

If you have a Linux kernel that can sleep on your system, then hopefully this user guide should help.

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    The wake_up_interruptible() function only wakes up tasks that are in interruptible wait mode, so it’s only useful if you really don’t want to wake up tasks in an uninterruptible pause.

    The core Linux documentation at Documentation/timers/timers-howto.txt gives a good overview of the most important methods:

    linux kernel might sleep

    Insert delays----------------Undoubtedly, the first and most useful question you should ask yourself is “MyCode in nuclearom context? It should be followed by "Does".does it really need to be reduced in an atomic context?" If yes...ATOMIC CONTEXT:    They exploit the need for the *delay family of functions. This    The functions use Jiffie's current clock rate estimate.    and will be busy shifting enough cycles that you can achieve    Best Lead Time:    ndelay (rather long unsigned ns)    udelay (huge unsigned yuzeki)    mdelay (time-consuming unsigned milliseconds)    udelay is our favorite global API; delay level    Accuracy may not matter much on many non-PC devices.    mdelay is a wrapper macro almost udelay that takes into account    Possible overflow when passing large arguments to udelay.    In general, the use of mdelay is highly discouraged and code should do so.   redesigned to allow the use of msleep.NON-ATOMIC CONTEXT:    You must use functions from the *sleep[_range] family.    There are several advanced options here, although any of them can do this.    work competently, with a "good" will to sleep    helpThink it's a scheduler, power management and just your guarantee    more tempting driver :)    -- Easily protected by a busy wait loop:        udelay (usecs too long unsigned)    -- Supported in hours:        usleep_range (unsigned long min, unsigned length max)    -- Supported by Jiffies/Legacy_timers        msleep (unsigned long milliseconds)        msleep_interruptible (unsigned ms)    Contrary to what you see, the *delay family is the main mechanism    The behavior of each of these call types is different, hence their existence.    You should be more aware of quirks.    SLEEP FOR "SOME" USES (<~10 us?):        * Use specific        - Why do not you sleep?            On more measured systems (embedded OR, maybe speed -            was looking for a comp!) efforts to set the clock correctly           Sleeping in *must* is not always worth it. Such an overview            this will of course depend on your particular situation, but            Here's what you need to know.    SLEEP FOR ~USECS OR SMALL MSECS (10µs-20ms):        * Use usleep_range       - Why don't get msleep (1ms-20ms)?            Originally explained here:http://lkml.org/lkml/2007/8/3/250            msleep(1~20) may not do what the caller intended, and            Often longer charge range (~20ms of actual sleep for all            reward in the range from 1 to 20 ms). In many cases this            behavior is not specific.        - Why is there definitely no "uslip" / is there a good beach in general?            Because usleep_range is extended in addition to htimers,            The alarm clock will certainly be very accurate (rather), so it's pretty easy            the usleep feature will probably bring more confidence            against unwanted interruptions.            With the beginning of the line is the scheduler            completely free to combine your alarm clock with any other type of alarm clock            it could have happened for other reasons or            In the worst case, you will call an interrupt for your upper limit.            The larger the range you set, the greater the chance            that you probably won't cause an interrupt; must            be in balance with what is the approved ceiling            Delay/power intended for your specific code path. I agreeSep            Tolerances are highly dependent on the situation, so            can be left to the caller to evaluate the appropriate range.    SLEEP LONGER MS (10ms+)        * Use msleep, though maybe msleep_interruptible

    Can kernel threads sleep?

    The sleep service puts the calling kernel thread to sleep and causes it to wait for a functional wakeup for all channels specified in the chan parameter. Therefore, after returning from sleep, each thread must check to see if it needs to sleep again.

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