Re: RT and XFS

[Christoph Hellwig <hch@infradead.org>]

On Thu, Jul 14, 2005 at 08:56:58AM -0700, Daniel Walker wrote:
> On Thu, 2005-07-14 at 07:23 +0200, Ingo Molnar wrote:
> > * Daniel Walker <dwalker@mvista.com> wrote:
> > 
> > > > The whole point of using a semaphore in the pagebuf is because there
> > > > is no tracking of who "owns" the lock so we can actually release it
> > > > in a different context. Semaphores were invented for this purpose,
> > > > and we use them in the way they were intended. ;)
> > > 
> > > Where is the that semaphore spec, is that posix ?  There is a new 
> > > construct called "complete" that is good for this type of stuff too. 
> > > No owner needed , just something running, and something waiting till 
> > > it completes.
> > 
> > wrt. posix, we dont really care about that for kernel-internal 
> > primitives like struct semaphore. So whether it's posix or not has no 
> > relevance.
> 
> This reminds me of Documentation/stable_api_nonsense.txt . That no one
> should really be dependent on a particular kernel API doing a particular
> thing. The kernel is play dough for the kernel hacker (as it should be),
> including kernel semaphores.
> 
> So we can change whatever we want, and make no excuses, as long as we
> fix the rest of the kernel to work with our change. That seems pretty
> sensible , because Linux should be an evolution. 
> 
> Daniel
> 
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