[bagpatch] VM sneak preview

[bagpatch] VM sneak preview

[Rik van Riel]

Hi,

as Roger Larson pointed out, one detail from my "new VM
sneak preview" patch doesn't make much sense. It does
not affect stability <hint> the patch has been running
smoothly for a number of people, you may want to try it</hint>.

You can fix it by editing mm/filemap.c and changing the
following code fragment (around line 270):

+               if (PageTestandClearReferenced(page)) {
+                       page->age += 3;
+                       if (page->age > 10)
+                               page->age = 0;
                                           ^^ should be 10
+                       goto dispose_continue;
+               }

Here the code checks if page->age exceeds the maximum. Of
course page->age should be set to the maximum value if it
does, and not all the way down to 0 :)

If you checked the patch and wondered why performance wasn't
always good ... this is it, things should just work now...

regards,

Rik
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