Hugh Dickins wrote:
On Fri, 20 Apr 2007, Rik van Riel wrote:
Andrew Morton wrote:
I do go on about that. But we're adding page flags at about one per
year, and when we run out we're screwed - we'll need to grow the
pageframe.
If you want, I can take a look at folding this into the
->mapping pointer. I can guarantee you it won't be
pretty, though :)
Please don't. If we're going to stuff another pageflag into there,
let it be PageSwapCache the natural partner of PageAnon, rather than
whatever our latest pageflag happens to be.
I looked at doing what Andrew wanted, and it did indeed not
look like the right thing to do. The locking on page->mapping
is the kind of locking we want to avoid during zap_page_range
and in the pageout code.
I like your suggestion better.
--
Politics is the struggle between those who want to make their country
the best in the world, and those who believe it already is. Each group
calls the other unpatriotic.
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