On Fri, Jul 18, 2014 at 4:45 PM, Johannes Weiner <hannes@xxxxxxxxxxx> wrote: > I assumed the source page would always be new, according to this part > in fuse_try_move_page(): > > /* > * This is a new and locked page, it shouldn't be mapped or > * have any special flags on it > */ > if (WARN_ON(page_mapped(oldpage))) > goto out_fallback_unlock; > if (WARN_ON(page_has_private(oldpage))) > goto out_fallback_unlock; > if (WARN_ON(PageDirty(oldpage) || PageWriteback(oldpage))) > goto out_fallback_unlock; > if (WARN_ON(PageMlocked(oldpage))) > goto out_fallback_unlock; > > However, it's in the page cache and I can't really convince myself > that it's not also on the LRU. Miklos, I have trouble pinpointing > where oldpage is instantiated exactly and what state it might be in - > can it already be on the LRU? oldpage comes from ->readpages() (*NOT* ->readpage()), i.e. readahead. AFAICS it is added to the LRU in read_cache_pages(), so it looks like it is definitely on the LRU at that point. Thanks, Miklos -- 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>