Re: kswapd in tight loop 2.6.9-rc3-bk-recent

[Andrew Morton]

Nick Piggin <piggin@xxxxxxxxxxxxxxx> wrote:
>
> >Chris Wright <chrisw@xxxxxxxx> wrote:
>  >
>  >>(whereas I could get the mainline code, and the
>  >> one-liner to spin right off).  
>  >>
>  >
>  >How?  (up to and including .config please).
>  >
>  >
>  >
> 
>  Ah, free_pages <= pages_high, ie. 0 <= 0, which is true;
>  commence spinning.

Maybe.  It requires that the zonelists be screwy:

 Node 1 DMA free:0kB min:0kB low:0kB high:0kB active:0kB inactive:0kB present:0kB
 protections[]: 0 0 0
 Node 1 Normal free:25272kB min:1020kB low:2040kB high:3060kB active:624172kB inactive:282700kB present:1047936kB
 protections[]: 0 0 0
 Node 1 HighMem free:0kB min:128kB low:256kB high:384kB active:0kB inactive:0kB present:0kB
 protections[]: 0 0 0
 Node 0 DMA free:728kB min:12kB low:24kB high:36kB active:788kB inactive:7848kB present:16384kB
 protections[]: 0 0 0
 Node 0 Normal free:27200kB min:1004kB low:2008kB high:3012kB active:332792kB inactive:422744kB present:1032188kB
 protections[]: 0 0 0
 Node 0 HighMem free:0kB min:128kB low:256kB high:384kB active:0kB inactive:0kB present:0kB
 protections[]: 0 0 0

See that DMA zone on node 1?  Wonder how it got like that.  It
should not be inside pgdat->nrzones anyway.

David, is your setup NUMA?  Can you show us a sysrq-M dump?

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