On Mon, Mar 21, 2016 at 11:25:09AM -0500, Christoph Lameter wrote: > On Mon, 21 Mar 2016, Kirill A. Shutemov wrote: > > > PAGE_CACHE_{SIZE,SHIFT,MASK,ALIGN} macros were introduced *long* time ago > > with promise that one day it will be possible to implement page cache with > > bigger chunks than PAGE_SIZE. > > > > This promise never materialized. And unlikely will. > > So we decided that we are never going to put THP pages on a LRU? Err?.. What? We do have anon-THP pages on LRU. My huge tmpfs patchset also put file-THPs on LRU list. The patchset has nothing to do with THP or them being on LRU. > Will this actually work if we have really huge memory (100s of TB) where > almost everything is a huge page? Guess we have to use hugetlbfs and we > need to think about this as being exempt from paging. Sorry, I failed to understand your message. Look on huge tmpfs patchset. It allows both small and huge pages in page cache. Anyway, it's out of scope of the patchset. -- Kirill A. Shutemov -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>