Re: page fault scalability patch V12 [0/7]: Overview andperformance tests

[Andrew Morton]

Hugh Dickins <hugh@xxxxxxxxxxx> wrote:
>
> On Fri, 10 Dec 2004, Andrew Morton wrote:
> > Hugh Dickins <hugh@xxxxxxxxxxx> wrote:
> > >
> > > > > (I do wonder why do_anonymous_page calls mark_page_accessed as well as
> > > > > lru_cache_add_active.  The other instances of lru_cache_add_active for
> > > > > an anonymous page don't mark_page_accessed i.e. SetPageReferenced too,
> > > > > why here?  But that's nothing new with your patch, and although you've
> > > > > reordered the calls, the final page state is the same as before.)
> > 
> > The point is a good one - I guess that code is a holdover from earlier
> > implementations.
> > 
> > This is equivalent, no?
> 
> Yes, it is equivalent to use SetPageReferenced(page) there instead.
> But why is do_anonymous_page adding anything to lru_cache_add_active,
> when its other callers leave it at that?  What's special about the
> do_anonymous_page case?

do_swap_page() is effectively doing the same as do_anonymous_page(). 
do_wp_page() and do_no_page() appear to be errant.
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