On Sat, Jun 23, 2012 at 11:53 AM, Rik van Riel [off-list ref] wrote:

On 06/23/2012 12:45 AM, Kamezawa Hiroyuki wrote:

quoted

I think this is interesting approach. Major concern is how to guarantee
EReclaimable
pages are really EReclaimable...Do you have any idea ? madviced pages
are really EReclaimable ?

I suspect the EReclaimable pages can only be clean page
cache pages that are not mapped by any processes.

Once somebody tries to use the page, mark_page_accessed
will move it to another list.

100% agree.

quoted

A (very) small concern is will you use one more page-flags for this ? ;)

This could be an issue on a 32 bit system, true.

Do we really need SwapBacked bit? Actually swap-backed is
per-superblock attribute and don't change dynamically (i.e. no race
happen). thus this bit
might be able to move into page->mapping or page->mapping->host.

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