Re: why are some low-level MM routines being exported?

[Evgeniy Polyakov <zbr@ioremap.net>]

On Mon, Apr 05, 2010 at 09:36:00AM +0900, Minchan Kim (minchan.kim@gmail.com) wrote:
> > All filesystems already call it through find_or_create_page() or
> > grab_page() invoked via read path. In some cases fs has more than
> > one page grabbed via its internal path where data to be read is
> > already placed, so it may want just to add those pages into mm lru.
> 
> I understood why it does need that in pohmelfs.
> AFAIU, other file system using general functions(ex, mpage_readpages or
> read_cache_pages) don't need direct LRU handling since it's hided.
> But pohmelfs doesn't use general functions.
> 
> Isn't pagevec_lru_add_file enough like other file system(ex, nfs, cifs)?

This will force to reinvent add_to_page_cache_lru() by doing private
function which will call add_to_page_cache() and pagevec_lru_add_file(),
which is effectively what is being done for file backed pages in
add_to_page_cache_lru().

-- 
	Evgeniy Polyakov

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