On Thu, May 11, 2017 at 10:22:13AM +0900, Minchan Kim wrote:
> On Thu, May 11, 2017 at 08:25:56AM +0900, Minchan Kim wrote:
> > On Wed, May 10, 2017 at 09:56:54AM -0400, Johannes Weiner wrote:
> > > Hi Michan,
> > >
> > > On Tue, May 02, 2017 at 08:53:32AM +0900, Minchan Kim wrote:
> > > > @@ -1144,7 +1144,7 @@ void swap_free(swp_entry_t entry)
> > > > /*
> > > > * Called after dropping swapcache to decrease refcnt to swap entries.
> > > > */
> > > > -void swapcache_free(swp_entry_t entry)
> > > > +void __swapcache_free(swp_entry_t entry)
> > > > {
> > > > struct swap_info_struct *p;
> > > >
> > > > @@ -1156,7 +1156,7 @@ void swapcache_free(swp_entry_t entry)
> > > > }
> > > >
> > > > #ifdef CONFIG_THP_SWAP
> > > > -void swapcache_free_cluster(swp_entry_t entry)
> > > > +void __swapcache_free_cluster(swp_entry_t entry)
> > > > {
> > > > unsigned long offset = swp_offset(entry);
> > > > unsigned long idx = offset / SWAPFILE_CLUSTER;
> > > > @@ -1182,6 +1182,14 @@ void swapcache_free_cluster(swp_entry_t entry)
> > > > }
> > > > #endif /* CONFIG_THP_SWAP */
> > > >
> > > > +void swapcache_free(struct page *page, swp_entry_t entry)
> > > > +{
> > > > + if (!PageTransHuge(page))
> > > > + __swapcache_free(entry);
> > > > + else
> > > > + __swapcache_free_cluster(entry);
> > > > +}
> > >
> > > I don't think this is cleaner :/
>
> Let's see a example add_to_swap. Without it, it looks like that.
>
> int add_to_swap(struct page *page)
> {
> entry = get_swap_page(page);
> ..
> ..
> fail:
> if (PageTransHuge(page))
> swapcache_free_cluster(entry);
> else
> swapcache_free(entry);
> }
>
> It doesn't looks good to me because get_swap_page hides
> where entry allocation is from cluster or slot but when
> we free the entry allocated, we should be aware of the
> internal and call right function. :(
This could be nicer indeed. I just don't like the underscore versions
much, but symmetry with get_swap_page() would be nice.
How about put_swap_page()? :)
That can call the appropriate swapcache_free function then.
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