Re: [RFC/PATCH] FUSYN Realtime & robust mutexes for Linux, v2.3.1

[Andrew Morton]

Ulrich Drepper <drepper@xxxxxxxxxx> wrote:
>
> Andrew Morton wrote:
> 
> > This fixes what appear to be some fairly significant shortcomings.  What do
> > the futex and NPTL people have to say about the gravity of the problems
> > which this solves, and the offered implementation?
> 
> This code will not be suppoerted by the glibc code.  Using these
> primitives would mean significant slowdown of all operations and this
> for problems which only a few people have.

How large is the slowdown, and on what workloads?

>  I asked to get the useful
> parts of the code to be made available using the current futex interface
> (robust mutexes are useful)

Passing the lock to a non-rt task when there's an rt-task waiting for it
seems pretty poor form, too.

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