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 X-Spam-Level: X-Spam-Status: No, score=-11.3 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,NICE_REPLY_A,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 0013FC00A89 for ; Thu, 5 Nov 2020 12:54:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 6B38520756 for ; Thu, 5 Nov 2020 12:54:35 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=suse.com header.i=@suse.com header.b="DU7bUUIT" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730184AbgKEMye (ORCPT ); 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Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <20201103133108.148112-7-wqu@suse.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 3.11.20 г. 15:30 ч., Qu Wenruo wrote: > Btrfs only support 64K as max node size, thus for 4K page system, we > would have at most 16 pages for one extent buffer. > > For a system using 64K page size, we would really have just one > single page. > > While we always use 16 pages for extent_buffer::pages[], this means for > systems using 64K pages, we are wasting memory for the 15 pages which > will never be utilized. > > So this patch will change how the extent_buffer::pages[] array size is > calclulated, now it will be calculated using > BTRFS_MAX_METADATA_BLOCKSIZE and PAGE_SIZE. > > For systems using 4K page size, it will stay 16 pages. > For systems using 64K page size, it will be just 1 page. > > Signed-off-by: Qu Wenruo > Signed-off-by: David Sterba > --- > fs/btrfs/extent_io.c | 6 +++--- > fs/btrfs/extent_io.h | 8 +++++--- > 2 files changed, 8 insertions(+), 6 deletions(-) > > diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c > index ac396d8937b9..092d9f69abb2 100644 > --- a/fs/btrfs/extent_io.c > +++ b/fs/btrfs/extent_io.c > @@ -4990,9 +4990,9 @@ __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, > /* > * Sanity checks, currently the maximum is 64k covered by 16x 4k pages > */ > - BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE > - > MAX_INLINE_EXTENT_BUFFER_SIZE); > - BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); > + BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE > > + INLINE_EXTENT_BUFFER_PAGES * PAGE_SIZE); nit: We want BUILD_BUG_ON(btrfs_max_metadata_blocksize != inline_extent_buffer_pages * page_size) With this minor thing: Reviewed-by: Nikolay Borisov