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SubjectRe: page_launder() bug


On 7 May 2001, Linus Torvalds wrote:

> But it is important to re-calculate the deadness after getting the
> lock. Before, it was just an informed guess. After the lock, it is
> knowledge. And you can use informed guesses for heuristics, but you
> must _not_ use them for any serious decisions.

And thats what swap_writepage() is doing:

static int swap_writepage(struct page *page)
{
/* One for the page cache, one for this user, one for page->buffers */
if (page_count(page) > 2 + !!page->buffers)
goto in_use;
if (swap_count(page) > 1)
goto in_use;

...
}



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