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=-9.6 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 46454C433E0 for ; Fri, 15 May 2020 13:17:30 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 22A2D20709 for ; Fri, 15 May 2020 13:17:30 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="nrbQmsny" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727030AbgEONR3 (ORCPT ); Fri, 15 May 2020 09:17:29 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:51282 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726632AbgEONRE (ORCPT ); Fri, 15 May 2020 09:17:04 -0400 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1DAAAC05BD0E; Fri, 15 May 2020 06:17:03 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=TfKJJimoKlvRsCM0paiVClt+UpHKBMIygN+uHMldA9w=; b=nrbQmsnyDrNzpDeCvgGAQ6d9Zr N7w9Tc/yqPDrXRlMvfBajD4Gf8y0bJljDa9818uaX/Bfih9si5rm/N2jnX9m0RIg8Me5l1905nTlB HJOm/DJ5lNs9+gounmGcw4AhzzTOsOTgeYlqZF7mevzEtzkc7Ae/QL4qU5M4pu8v/v7v49VKAGuMe dK/fOlcjhomGUZS1iKLmJS+qQtvT8QUdvBt+G5YMFqrjb35E8D+d20E28FcVp8cFncxjbIgG46dKS ZqfTX0DaTO8eG8lB/T818szUf6+sV68HnMvEp5gEnkRCtbgSTdRox+VqpZsQBPwdUCLGXexUM25ir mN/MKKvw==; Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1jZaD0-0005pi-Ts; Fri, 15 May 2020 13:17:02 +0000 From: Matthew Wilcox To: linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 34/36] mm: Allow PageReadahead to be set on head pages Date: Fri, 15 May 2020 06:16:54 -0700 Message-Id: <20200515131656.12890-35-willy@infradead.org> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200515131656.12890-1-willy@infradead.org> References: <20200515131656.12890-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: "Matthew Wilcox (Oracle)" Adjust the callers to only call PageReadahead on the head page. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/page-flags.h | 4 ++-- mm/filemap.c | 10 +++++----- 2 files changed, 7 insertions(+), 7 deletions(-) diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h index 979460df4768..a3110d675cd0 100644 --- a/include/linux/page-flags.h +++ b/include/linux/page-flags.h @@ -377,8 +377,8 @@ PAGEFLAG(MappedToDisk, mappedtodisk, PF_NO_TAIL) /* PG_readahead is only used for reads; PG_reclaim is only for writes */ PAGEFLAG(Reclaim, reclaim, PF_NO_TAIL) TESTCLEARFLAG(Reclaim, reclaim, PF_NO_TAIL) -PAGEFLAG(Readahead, reclaim, PF_NO_COMPOUND) - TESTCLEARFLAG(Readahead, reclaim, PF_NO_COMPOUND) +PAGEFLAG(Readahead, reclaim, PF_ONLY_HEAD) + TESTCLEARFLAG(Readahead, reclaim, PF_ONLY_HEAD) #ifdef CONFIG_HIGHMEM /* diff --git a/mm/filemap.c b/mm/filemap.c index 56eb086acef8..f3f03705c025 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2067,7 +2067,7 @@ static ssize_t generic_file_buffered_read(struct kiocb *iocb, if (unlikely(page == NULL)) goto no_cached_page; } - if (PageReadahead(page)) { + if (PageReadahead(compound_head(page))) { page_cache_async_readahead(mapping, ra, filp, page, index, last_index - index); @@ -2454,7 +2454,7 @@ static struct file *do_async_mmap_readahead(struct vm_fault *vmf, return fpin; if (ra->mmap_miss > 0) ra->mmap_miss--; - if (PageReadahead(page)) { + if (PageReadahead(compound_head(page))) { fpin = maybe_unlock_mmap_for_io(vmf, fpin); page_cache_async_readahead(mapping, ra, file, page, offset, ra->ra_pages); @@ -2640,11 +2640,11 @@ void filemap_map_pages(struct vm_fault *vmf, /* Has the page moved or been split? */ if (unlikely(page != xas_reload(&xas))) goto skip; + if (PageReadahead(page)) + goto skip; page = find_subpage(page, xas.xa_index); - if (!PageUptodate(page) || - PageReadahead(page) || - PageHWPoison(page)) + if (!PageUptodate(page) || PageHWPoison(page)) goto skip; if (!trylock_page(page)) goto skip; -- 2.26.2