On 28 Jan 2021, at 2:03, Matthew Wilcox (Oracle) wrote: > If we know we have a folio, we can call put_folio() instead of put_page() > and save the overhead of calling compound_head(). Also skips the > devmap checks. > > Signed-off-by: Matthew Wilcox (Oracle) <[email protected]> > --- > include/linux/mm.h | 15 ++++++++++----- > 1 file changed, 10 insertions(+), 5 deletions(-) > > diff --git a/include/linux/mm.h b/include/linux/mm.h > index 7d787229dd40..873d649107ba 100644 > --- a/include/linux/mm.h > +++ b/include/linux/mm.h > @@ -1220,9 +1220,15 @@ static inline __must_check bool try_get_page(struct > page *page) > return true; > } > > +static inline void put_folio(struct folio *folio) > +{ > + if (put_page_testzero(&folio->page)) > + __put_page(&folio->page); > +} > + > static inline void put_page(struct page *page) > { > - page = compound_head(page); > + struct folio *folio = page_folio(page); > > /* > * For devmap managed pages we need to catch refcount transition from > @@ -1230,13 +1236,12 @@ static inline void put_page(struct page *page) > * need to inform the device driver through callback. See > * include/linux/memremap.h and HMM for details. > */ > - if (page_is_devmap_managed(page)) { > - put_devmap_managed_page(page); > + if (page_is_devmap_managed(&folio->page)) { > + put_devmap_managed_page(&folio->page); > return; > } > > - if (put_page_testzero(page)) > - __put_page(page); > + put_folio(folio); > } > > /* > -- > 2.29.2
LGTM. Reviewed-by: Zi Yan <[email protected]> — Best Regards, Yan Zi
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