Re: [patch 00/19] VM pageout scalability improvements

[Rik van Riel]

On Fri, 04 Jan 2008 17:34:00 +0100
Andi Kleen <andi@xxxxxxxxxxxxxx> wrote:
> Lee Schermerhorn <Lee.Schermerhorn@xxxxxx> writes:
> 
> > We can easily [he says, glibly] reproduce the hang on the anon_vma lock
> 
> Is that a NUMA platform? On non x86? Perhaps you just need queued spinlocks?

I really think that the anon_vma and i_mmap_lock spinlock hangs are
due to the lack of queued spinlocks.  Not because I have seen your
system hang, but because I've seen one of Larry's test systems here
hang in scary/amusing ways :)

With queued spinlocks the system should just slow down, not hang.

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