RE: is there a "lru_cache_add_anon_tail"?

[Dan Magenheimer <dan.magenheimer@oracle.com>]

> From: KOSAKI Motohiro [mailto:kosaki.motohiro@gmail.com]
> Subject: Re: is there a "lru_cache_add_anon_tail"?
> 
> On Thu, May 10, 2012 at 12:13 PM, Dan Magenheimer
> <dan.magenheimer@oracle.com> wrote:
> > (Still working on allowing zcache to "evict" swap pages...)
> >
> > Apologies if I got head/tail reversed as used by the
> > lru queues... the "directional sense" of the queues is
> > not obvious so I'll describe using different terminology...
> >
> > If I have an anon page and I would like to add it to
> > the "reclaim soonest" end of the queue instead of the
> > "most recently used so don't reclaim it for a long time"
> > end of the queue, does an equivalent function similar to
> > lru_cache_add_anon(page) exist?
> >
> 
> AFAIK, no exist.
> rotate_reclaimable_page() has similar requirement, but I doubt
> you can reuse it. maybe you need new function by yourself.

Thanks for the pointer!  It looks like I can extract
the code I need from there.
 
> But note, many people dislike add_anon_tail feature. -ck patch had
> swap prefetch patch and it made performance decrease. I'm not
> sure it is good improvemnt for zcache....

I understand.  I think it does make sense for this
usage in zcache but will describe it when I am ready
to post an RFC.

Thanks,
Dan

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