On Fri, Feb 26, 2021 at 12:13:14PM +0000, Matthew Wilcox wrote: > On Fri, Feb 26, 2021 at 02:17:18AM -0700, Yu Zhao wrote: > > All places but one test, set or clear PG_active and PG_unevictable on > > small or head pages. Use compound_head() explicitly for that singleton > > so the rest can rid of redundant compound_head(). > > How do you know it's only one place? I really wish you'd work with me > on folios. They make the compiler prove that it's not a tail page.
+1 to this. The problem with compound_head() is systemic and ad-hoc solution to few page flags will only complicate the picture. -- Kirill A. Shutemov
