Naoya Horiguchi wrote: > Thp related code also uses per process mm->page_table_lock now. So making > it fine-grained can provide better performance. > > This patch makes thp support split page table lock which makes us use > page->ptl of the pages storing "pmd_trans_huge" pmds.
Hm. So, you use page->ptl only when you deal with thp pages, otherwise mm->page_table_lock, right? It looks inconsistent to me. Does it mean we have to take both locks on split and collapse paths? I'm not sure if it's safe to take only page->ptl for alloc path. Probably not. Why not to use new locking for pmd everywhere? -- Kirill A. Shutemov -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
