how long wait_for_completion_interruptible_timeout() blocks

[anish singh]

On Wed, Jun 19, 2019 at 10:47 PM Subhashini Rao Beerisetty <
subhashbeerisetty at gmail.com> wrote:

> Hi All,
>
> I’ve two Linux systems, I tried to measure how long
> wait_for_completion_interruptible_timeout() blocked after completion
> is signaled by complete() call. I noticed two different results in
> both systems.
>
> In one system I noticed this duration in between 10 to 60 micro
> seconds, where as in other system  it is in between 20 to 500 micro
> seconds. I’d like to know what factors can affect this latency? Also,
> is there any solution to reduce this latency?


This is a problem which is fixed by RT Linux patches.
It is taking time as Linux is not RTOS and scheduler took time to put your
task in running state which is expected and depends on many factors: such
as load, interrupts and so on.

>
>
>
> Thanks,
>
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