> On Nov 20, 2018, at 7:12 AM, Michal Hocko <mhocko@xxxxxxxxxx> wrote: > > + /* > + * Check the locked pages before taking a reference to not > + * go in the way of migration. > + */ Could you make this a tiny bit more explanative, something like: + /* + * Check for a locked page first, as a speculative + * reference may adversely influence page migration. + */ Reviewed-by: William Kucharski <william.kucharski@xxxxxxxxxx>