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=-12.5 required=3.0 tests=BAYES_00,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=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 32E58C43461 for ; Thu, 10 Sep 2020 18:33:28 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 8A9B52087C for ; Thu, 10 Sep 2020 18:33:27 +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="Z0ig8BZO" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 8A9B52087C Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 9F9D68E0001; Thu, 10 Sep 2020 14:33:26 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 9AA766B0071; Thu, 10 Sep 2020 14:33:26 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 8C0778E0001; Thu, 10 Sep 2020 14:33:26 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0005.hostedemail.com [216.40.44.5]) by kanga.kvack.org (Postfix) with ESMTP id 728A66B0068 for ; Thu, 10 Sep 2020 14:33:26 -0400 (EDT) Received: from smtpin26.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id 41E39362B for ; Thu, 10 Sep 2020 18:33:26 +0000 (UTC) X-FDA: 77247999612.26.money29_380341f270e8 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin26.hostedemail.com (Postfix) with ESMTP id 0A4031804B660 for ; Thu, 10 Sep 2020 18:33:26 +0000 (UTC) X-HE-Tag: money29_380341f270e8 X-Filterd-Recvd-Size: 3539 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf29.hostedemail.com (Postfix) with ESMTP for ; Thu, 10 Sep 2020 18:33:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.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=5pz6pk0hQVCAmUCzXhhMl6SI7ek8eXmhvDqxhMsMWZA=; b=Z0ig8BZOOs874Iqk+s8Hjq2poV GfUU0UHAUN9Q10UU2Qc227BQGYSAuBuImaK2JLeoDFbGlpRzkAAOn6+/YaptLDl2FRANNaxYmEE3w mM4+ZjVmKwqOk3NY3DlezWO3uDRW1yESEcjvvUwqea0D+xOlNL846Qr76zhGuKKjx9HOj3KgtZscS jit7EaGeKPNdD6jg3LNu0n3gynAd6wlhzi9Hsj3R5Mi0n4mt1NX4STEfYrPFDWo1mhNjNsHg18nlj vZc8Lz/HCP7Iav4W1Li83NNG/RE38e7EQqq6JJ3V+y6qbzdR40ePerF8p7gTuN16/gueZ/fX6Ngp1 qzZoxrDw==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kGRNo-0005GA-TG; Thu, 10 Sep 2020 18:33:20 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org Cc: "Matthew Wilcox (Oracle)" , Andrew Morton , Hugh Dickins , William Kucharski , Jani Nikula , Alexey Dobriyan , Johannes Weiner , Chris Wilson , Matthew Auld , Huang Ying , intel-gfx@lists.freedesktop.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 3/8] mm: Optimise madvise WILLNEED Date: Thu, 10 Sep 2020 19:33:13 +0100 Message-Id: <20200910183318.20139-4-willy@infradead.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200910183318.20139-1-willy@infradead.org> References: <20200910183318.20139-1-willy@infradead.org> MIME-Version: 1.0 X-Rspamd-Queue-Id: 0A4031804B660 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 Content-Transfer-Encoding: quoted-printable X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Instead of calling find_get_entry() for every page index, use an XArray iterator to skip over NULL entries, and avoid calling get_page(), because we only want the swap entries. Signed-off-by: Matthew Wilcox (Oracle) Acked-by: Johannes Weiner --- mm/madvise.c | 21 ++++++++++++--------- 1 file changed, 12 insertions(+), 9 deletions(-) diff --git a/mm/madvise.c b/mm/madvise.c index dd1d43cf026d..96189acd6969 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -224,25 +224,28 @@ static void force_shm_swapin_readahead(struct vm_ar= ea_struct *vma, unsigned long start, unsigned long end, struct address_space *mapping) { - pgoff_t index; + XA_STATE(xas, &mapping->i_pages, linear_page_index(vma, start)); + pgoff_t end_index =3D end / PAGE_SIZE; struct page *page; - swp_entry_t swap; =20 - for (; start < end; start +=3D PAGE_SIZE) { - index =3D ((start - vma->vm_start) >> PAGE_SHIFT) + vma->vm_pgoff; + rcu_read_lock(); + xas_for_each(&xas, page, end_index) { + swp_entry_t swap; =20 - page =3D find_get_entry(mapping, index); - if (!xa_is_value(page)) { - if (page) - put_page(page); + if (!xa_is_value(page)) continue; - } + rcu_read_unlock(); + swap =3D radix_to_swp_entry(page); page =3D read_swap_cache_async(swap, GFP_HIGHUSER_MOVABLE, NULL, 0, false); if (page) put_page(page); + + rcu_read_lock(); + xas_reset(&xas); } + rcu_read_unlock(); =20 lru_add_drain(); /* Push any new pages onto the LRU now */ } --=20 2.28.0