On Thu, Apr 04, 2024 at 09:45:58AM -0400, Peter Xu wrote: > On Thu, Apr 04, 2024 at 01:05:57AM +0100, Matthew Wilcox wrote: > > if (PageHuge(page)) > > page = compound_head(page); > > I would think PageHead() check would help us to avoid compound_head() on > heads, which should still be the majority cases iiuc (assuming page->flags > is already around in the cache anyway). I've no strong opinion though, as > I can hardly tell a difference in reality. compound_head() includes a check for PageHead(). Adding the check just makes things slower.
