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

[Lee Schermerhorn]

On Fri, 2008-01-04 at 17:34 +0100, Andi Kleen 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?

We see this on both NUMA and non-NUMA. x86_64 and ia64.  The basic
criteria to reproduce is to be able to run thousands [or low 10s of
thousands] of tasks, continually increasing the number until the system
just goes into reclaim.  Instead of swapping, the system seems to
hang--unresponsive from the console, but with "soft lockup" messages
spitting out every few seconds...


Lee 


> 
> -Andi

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