Re: 2.4.23aa2 (bugfixes and important VM improvements for the highend)

[Andrew Morton]

Rik van Riel <riel@xxxxxxxxxx> wrote:
>
> > Current 2.6 will write out nr_inactive>>DEF_PRIORITY pages,
> 
>  That may be a bit much on extremely huge systems, but that should
>  require no more than a little tweaking to fix.  Certainly no code
>  changes should be needed ...

hmm, with 4 million pages on the inactive list that's 1000 pages.  It might
be OK.

Bear in mind that under usual circumstances the direct-reclaim path will
refuse to block on request queue exhaustion so we might end up just
scanning past some dirty pages without starting I/O against them at all. 
End result: some jumbling up of the LRU order.  I suspect that's a
second-order problem though.  But hey, if we have a testcase, we can fix it!
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