On Thu, 26 Mar 2015, Kirill A. Shutemov wrote:
> On Wed, Mar 25, 2015 at 03:48:48PM -0700, Hugh Dickins wrote:
> > On Wed, 25 Mar 2015, Hugh Dickins wrote:
> > > On Thu, 26 Mar 2015, Kirill A. Shutemov wrote:
> > > >
> > > > Since currently all THP pages are anonymous and all drivers pages are
> >
On Wed, Mar 25, 2015 at 03:48:48PM -0700, Hugh Dickins wrote:
> On Wed, 25 Mar 2015, Hugh Dickins wrote:
> > On Thu, 26 Mar 2015, Kirill A. Shutemov wrote:
> >
> > > THP uses tail page refcounting to be able to split huge page at any
> > > time. Tail page refcounting is not needed for rest users o
On Wed, 25 Mar 2015, Hugh Dickins wrote:
> On Thu, 26 Mar 2015, Kirill A. Shutemov wrote:
>
> > THP uses tail page refcounting to be able to split huge page at any
> > time. Tail page refcounting is not needed for rest users of compound
> > pages and it's harmful because of overhead.
> >
> > We t
On Thu, 26 Mar 2015, Kirill A. Shutemov wrote:
> THP uses tail page refcounting to be able to split huge page at any
> time. Tail page refcounting is not needed for rest users of compound
> pages and it's harmful because of overhead.
>
> We try to exclude non-THP pages from tail page refcounting
THP uses tail page refcounting to be able to split huge page at any
time. Tail page refcounting is not needed for rest users of compound
pages and it's harmful because of overhead.
We try to exclude non-THP pages from tail page refcounting using
__compound_tail_refcounted() check. It excludes most
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