On Fri, Jun 14, 2019 at 11:34:09AM +0200, Peter Zijlstra wrote:
> On Wed, May 08, 2019 at 05:43:33PM +0300, Kirill A. Shutemov wrote:
>
> > + lookup_page_ext(page)->keyid = keyid;
> > + lookup_page_ext(page)->keyid = 0;
Also, perhaps paranoid; but do we want something like:
static inline void page_set_keyid(struct page *page, int keyid)
{
/* ensure nothing creeps after changing the keyid */
barrier();
WRITE_ONCE(lookup_page_ext(page)->keyid, keyid);
barrier();
/* ensure nothing creeps before changing the keyid */
}
And this is very much assuming there is no concurrency through the
allocator locks.
