On Wed, Oct 23, 2024 at 2:00 PM Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote: > > On Wed, 23 Oct 2024 10:07:58 -0700 Suren Baghdasaryan <surenb@xxxxxxxxxx> wrote: > > > To simplify later changes to page tag references, introduce new > > pgtag_ref_handle type. This allows easy replacement of page_ext > > as a storage of page allocation tags. > > > > ... > > > > static inline void pgalloc_tag_copy(struct folio *new, struct folio *old) > > { > > + union pgtag_ref_handle handle; > > + union codetag_ref ref; > > struct alloc_tag *tag; > > - union codetag_ref *ref; > > > > tag = pgalloc_tag_get(&old->page); > > if (!tag) > > return; > > > > - ref = get_page_tag_ref(&new->page); > > - if (!ref) > > + if (!get_page_tag_ref(&new->page, &ref, &handle)) > > return; > > > > /* Clear the old ref to the original allocation tag. */ > > clear_page_tag_ref(&old->page); > > /* Decrement the counters of the tag on get_new_folio. */ > > - alloc_tag_sub(ref, folio_nr_pages(new)); > > - > > - __alloc_tag_ref_set(ref, tag); > > - > > - put_page_tag_ref(ref); > > + alloc_tag_sub(&ref, folio_nr_pages(new)); > > mm-stable has folio_size(new) here, fixed up. Oh, right. You merged that patch tonight and I formatted my patchset yesterday :) Thanks for the fixup. > > I think we aleady discussed this, but there's a crazy amount of > inlining here. pgalloc_tag_split() is huge, and has four callsites. I must have missed that discussion but I am happy to unline this function. I think splitting is heavy enough operation that this uninlining would not have be noticeable. Thanks!