On Wed, 3 Feb 2016 07:42:01 -0800 Dave Hansen <[email protected]> wrote:
> On 02/03/2016 07:14 AM, Kirill A. Shutemov wrote: > > But the new variant is somewhat slower. Current helpers iterates over > > VMAs the compound page is mapped to, and then over ptes within this VMA. > > New helpers iterates over small page, then over VMA the small page > > mapped to, and only then find relevant pte. > > The code simplification here is really attractive. Can you quantify > what the slowdown is? Is it noticeable, or would it be in the noise > during all the other stuff that happens under memory pressure? yup. And the "more testing is required" is a bit worrisome. Is this code really ready for getting pounded upon in -next?
