Re: Please stop apps going into state D uninterrupted sleep !!

["Patrick O'Callaghan" <pocallaghan@xxxxxxxxx>]

On Tue, 2012-05-08 at 15:35 -0700, Joe Zeff wrote:
> On 05/08/2012 03:17 PM, Sam Varshavchik wrote:
> >
> > It's not up to the app. This is not an optional system call. If the
> > kernel wants to put the task into uninterruptible sleep, that's what it
> > will do. End of story.
> 
> So let me get this straight: even if you know that this kind of thing 
> can happen and want to leave an escape switch available you can't simply 
> tell the kernel not to use this feature.  Interesting.

It's not a "feature", as in some optional extra, it's a fairly
fundamental aspect of how the kernel works. Any book on kernel hacking
will tell you the same. This is not to say that it couldn't be any other
way, but actually changing it would mean quite a radical redesign.
Nothing is impossible, but I wouldn't hold my breath if I were you.

poc

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