Re: RFC: Easy-Reclaimable LRU list

[KOSAKI Motohiro]

On Sat, Jun 23, 2012 at 11:53 AM, Rik van Riel <riel@xxxxxxxxxx> wrote:
> On 06/23/2012 12:45 AM, Kamezawa Hiroyuki wrote:
>
>> 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.


>> 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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