Re: [PATCH/RFC] wait_for_completion_timeout() considered harmful.

[Jonathan Corbet]

On Tue, 19 Nov 2013 00:42:09 +0100
Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:

> I briefly talked to Thomas about this earlier today and we need to fix
> this at a lower level -- the quick 'n dirty solution is to add 1 jiffy
> down in the timer-wheel when we enqueue these things.

That can lead to situations like the one I encountered years ago where
msleep(1) would snooze for 20ms.  I didn't get much love for my idea of
switching msleep() to hrtimers back then, but I still think it might be be
better to provide the resolution that the interface appears to promise.

jon
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