Re: write drop behind effect on active scanning
Daniel Phillips (phillips@bonn-fries.net)
Wed, 23 May 2001 16:33:44 +0200
On Wednesday 23 May 2001 09:33, Marcelo Tosatti wrote:
> Hi,
>
> I just noticed a "bad" effect of write drop behind yesterday during
> some tests.
>
> The problem is that we deactivate written pages, thus making the
> inactive list become pretty big (full of unfreeable pages) under
> write intensive IO workloads.
>
> So what happens is that we don't do _any_ aging on the active list,
> and in the meantime the inactive list (which should have "easily"
> freeable pages) is full of locked pages.
>
> I'm going to fix this one by replacing "deactivate_page(page)" to
> "ClearPageReferenced(page)" in generic_file_write(). This way the
> written pages are aged faster but we avoid the bad effect just
> described.
>
> Any comments on the fix ?
page->age = 0 ?
--
Daniel
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