On Mon, May 6, 2019 at 9:59 PM Michal Hocko <mhocko@xxxxxxxx> wrote: > > On Sun 05-05-19 14:40:57, Yafang Shao wrote: > > If CONFIG_TRANSPARENT_HUGEPAGE is not set, hpage_nr_pages() is always 1; > > if CONFIG_TRANSPARENT_HUGEPAGE is set, hpage_nr_pages() will > > call PageTransHuge() to judge whether the page is compound page or not. > > So we can use the result of hpage_nr_pages() to avoid uneccessary > > PageTransHuge(). > > The changelog doesn't describe motivation. Does this result in a better > code/performance? > It is a better code, I think. Regarding the performance, I don't think it is easy to measure. Thanks Yafang
