Re: compaction: trying to understand the code

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On Thu, Aug 19, 2010 at 03:09:38PM +0800, Iram Shahzad wrote:
> > The loop should be waiting for the _other_ processes (doing direct
> > reclaims) to proceed.  When there are _lots of_ ongoing page
> > allocations/reclaims, it makes sense to wait for them to calm down a bit?
> 
> I have noticed that if I run other process, it helps the loop to exit.
> So is this (ie hanging until other process helps) intended behaviour?
>
> Also, the other process does help the loop to exit, but again it enters
> the loop and the compaction is never finished. That is, the process
> looks like hanging. Is this intended behaviour?
> What will improve this situation?
 
What's your /proc/vmstat?  Does your system have thousands of
processes allocating memory concurrently? I'd like to make sure the
too_many_isolated() test is working as expected..

Thanks,
Fengguang

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