[dirtypatch] quickhack to make pre8/9 behave

[dirtypatch] quickhack to make pre8/9 behave

[Rik van Riel]

Hi,

with the quick&dirty patch below the system:
- gracefully (more or less) survives mmap002
- has good performance on mmap002

To me this patch shows that we really want to wait
for dirty page IO to finish before randomly evicting
the (wrong) clean pages and dying horribly.

This is a dirty hack which should be replaced by whichever
solution people thing should be implemented to have the
allocator waiting for dirty pages to be flushed out.

regards,

Rik
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