Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> wrote: > memcg information is only stored in the head page, so the memcg > subsystem needs to assure that all accesses are to the head page. > The first step is converting page_memcg() to folio_memcg(). > > The callers of page_memcg() and PageMemcgKmem() are not yet ready to be > converted to use folios, so retain them as wrappers around folio_memcg() > and folio_memcg_kmem(). They will be converted in a later patch set. > > Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx> > Reviewed-by: Christoph Hellwig <hch@xxxxxx> Reviewed-by: David Howells <dhowells@xxxxxxxxxx>
