Re: [2.4.17/18pre] VM and swap - it's really unusable
Sat, 12 Jan 2002 12:23:07 -0700
On Sat, Jan 12, 2002 at 06:48:28PM +0100, Roman Zippel wrote:
> email@example.com wrote:
> > No. The point of using semaphores is that one can sleep while
> > _waiting_ for the resource.
> > [...]
> > In a preemptive kernel this can cause a deadlock. In a non
> > preemptive it cannot. You are correct in that
> > B:
> > get sem on memory pool
> > do potentially blocking operations
> > release sem
> > is also dangerous - but I don't think that helps your case.
> > To fix B, we can enforce a coding rule - one of the reasons why
> > we have all those atomic ops in the kernel is to be able to
> > avoid this problem.
> Sorry I can't follow you. First, one can sleep while waiting for the
We're having a write only discussion - time to stop.
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