| Date | Sat, 12 Jan 2002 12:23:07 -0700 | From | yodaiken@fsmlabs ... | Subject | Re: [2.4.17/18pre] VM and swap - it's really unusable |
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On Sat, Jan 12, 2002 at 06:48:28PM +0100, Roman Zippel wrote: > Hi, > > yodaiken@fsmlabs.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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