[CCing linux-mm mailing list] On Wed 06-04-16 13:28:37, Frank Mehnert wrote: > Hi, > > Linux 4.5 introduced additional checks to ensure that compound pages are > never marked as reserved. In our code we use PG_reserved to ensure that > the kernel does never swap out such pages, e.g.
Are you putting your pages on the LRU list? If not how they could get swapped out? > > int i; > struct page *pages = alloc_pages(GFP_HIGHUSER | __GFP_COMP, 4); > for (i = 0; i < 16; i++) > SetPageReserved(&pages[i]); > > The purpose of setting PG_reserved is to prevent the kernel from swapping > this memory out. This worked with older kernel but not with Linux 4.5 as > setting PG_reserved to compound pages is not allowed any more. > > Can somebody explain how we can achieve the same result in accordance to > the new Linux 4.5 rules? > > Thanks, > > Frank -- Michal Hocko SUSE Labs
