From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D2846C001E0 for ; Mon, 31 Jul 2023 13:18:32 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230360AbjGaNSb (ORCPT ); Mon, 31 Jul 2023 09:18:31 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55720 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229977AbjGaNS3 (ORCPT ); Mon, 31 Jul 2023 09:18:29 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AC51110DF for ; Mon, 31 Jul 2023 06:18:28 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 2A1706113C for ; Mon, 31 Jul 2023 13:18:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id C7D57C433C8; Mon, 31 Jul 2023 13:18:18 +0000 (UTC) Date: Mon, 31 Jul 2023 14:18:12 +0100 From: Catalin Marinas To: Kefeng Wang Cc: Andrew Morton , Will Deacon , Mike Kravetz , Muchun Song , Mina Almasry , kirill@shutemov.name, joel@joelfernandes.org, william.kucharski@oracle.com, kaleshsingh@google.com, linux-mm@kvack.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 4/4] arm64: tlb: set huge page size to stride for hugepage Message-ID: References: <20230731074829.79309-1-wangkefeng.wang@huawei.com> <20230731074829.79309-5-wangkefeng.wang@huawei.com> <70e81ce8-a27a-325f-68d1-836532ed2ba0@huawei.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <70e81ce8-a27a-325f-68d1-836532ed2ba0@huawei.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Jul 31, 2023 at 07:27:14PM +0800, Kefeng Wang wrote: > On 2023/7/31 19:11, Catalin Marinas wrote: > > On Mon, Jul 31, 2023 at 03:48:29PM +0800, Kefeng Wang wrote: > > > +/* > > > + * We cannot use leaf-only invalidation here, since we may be invalidating > > > + * table entries as part of collapsing hugepages or moving page tables. > > > + * Set the tlb_level to 0 because we can not get enough information here. > > > + */ > > > +#define flush_tlb_range(vma, start, end) \ > > > + __flush_tlb_range(vma, start, end, \ > > > + ((vma)->vm_flags & VM_HUGETLB) \ > > > + ? huge_page_size(hstate_vma(vma)) \ > > > + : PAGE_SIZE, false, 0) > > > > This won't work if we use the contiguous PTE to get 64K hugetlb pages on > > a 4K base page configuration. The 16 base pages in the range would have > > to be invalidated individually (the contig PTE bit is just a hint, the > > hardware may or may not take it into account). > > Got it, the contig huge page is depended on hardware implementation, > but for normal hugepage(2M/1G), we could use this, right? Right. Only the pmd/pud cases. -- Catalin