Re: What if a TLB flush needed to sleep?

[Peter Zijlstra <peterz@xxxxxxxxxxxxx>]

On Wed, 2008-03-26 at 18:19 -0700, Christoph Lameter wrote:
> On Wed, 26 Mar 2008, Thomas Gleixner wrote:
> 
> > Please use a mutex, not a semaphore. semaphores should only be used
> > when you need a counting sempahore.
> 
> Seems that mutexes are mainly useful for 2 processor systems since they 
> do not allow concurrent read sections. We want multiple processors able 
> to reclaim pages within the same vma or file concurrently. This means 
> processors need to be able to concurrently walk potentially long lists of 
> vmas.

confusion between semaphores and rwsems



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