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 558F9C2D0A3 for ; Fri, 6 Nov 2020 12:30:52 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id A376F20825 for ; Fri, 6 Nov 2020 12:30:51 +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="wDr7t34w" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A376F20825 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 936D76B006E; Fri, 6 Nov 2020 07:30:48 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 8C5246B0070; Fri, 6 Nov 2020 07:30:48 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6CAC86B0071; Fri, 6 Nov 2020 07:30:48 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0017.hostedemail.com [216.40.44.17]) by kanga.kvack.org (Postfix) with ESMTP id 331E06B006E for ; Fri, 6 Nov 2020 07:30:48 -0500 (EST) Received: from smtpin09.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay04.hostedemail.com (Postfix) with ESMTP id BAEF71EE6 for ; Fri, 6 Nov 2020 12:30:47 +0000 (UTC) X-FDA: 77453927334.09.name81_2a0a0ec272d2 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin09.hostedemail.com (Postfix) with ESMTP id 9EDF1180AD815 for ; Fri, 6 Nov 2020 12:30:47 +0000 (UTC) X-HE-Tag: name81_2a0a0ec272d2 X-Filterd-Recvd-Size: 3673 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) by imf15.hostedemail.com (Postfix) with ESMTP for ; Fri, 6 Nov 2020 12:30:47 +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=kkDY/A+zQxc2i95QfvhU+XAHKtbfTy4uXu8lLNerbsw=; b=wDr7t34wIJm+GPx9QugRfOlaVv 65UOdzBqP/NbNfJsusEDba3Z6yAvZJD9jiHtHAwu+F9+Kfk8NhxMYlIV3Vongavmd3KbaiLdtlIGM 0CRoZFp9UeM6UQpDaLYqjQFxDWUQCNJdMUxDA4Qu0u+ymSMe8WSaQndx2vKVOxz+RO5Vl7zynUsE3 aiwakoI2jXgS0qYYT9GgFvlFiRMK88Ectkq8+rm/eqNCcSWIfKYS0Q7NQFCyATKHPpR6DueSVPE4D sQnryvoNQe+ag081u66tV7gXmP5JvX+kAmyb3x3nJ/UTo/+zqgTaLWuRmmSNobmUiPVede3UN1pMp kzUFX26w==; Received: from willy by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kb0t8-0007Ql-Fn; Fri, 06 Nov 2020 12:30:42 +0000 From: "Matthew Wilcox (Oracle)" To: linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, hch@lst.de, kent.overstreet@gmail.com Cc: "Matthew Wilcox (Oracle)" Subject: [PATCH 3/4] pagevec: Add dynamically allocated pagevecs Date: Fri, 6 Nov 2020 12:30:39 +0000 Message-Id: <20201106123040.28451-3-willy@infradead.org> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20201106123040.28451-1-willy@infradead.org> References: <20201106080815.GC31585@lst.de> <20201106123040.28451-1-willy@infradead.org> MIME-Version: 1.0 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: Add pagevec_alloc() and pagevec_free() to allow for pagevecs up to 255 entries in size. Signed-off-by: Matthew Wilcox (Oracle) --- include/linux/pagevec.h | 7 +++++++ mm/swap.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/include/linux/pagevec.h b/include/linux/pagevec.h index 4dc45392d776..4d5a48d7a372 100644 --- a/include/linux/pagevec.h +++ b/include/linux/pagevec.h @@ -36,6 +36,13 @@ struct pagevec { =20 void __pagevec_release(struct pagevec *pvec); void __pagevec_lru_add(struct pagevec *pvec); +struct pagevec *pagevec_alloc(unsigned long sz, gfp_t gfp); + +static inline void pagevec_free(struct pagevec *pvec) +{ + kfree(pvec); +} + void pagevec_remove_exceptionals(struct pagevec *pvec); =20 unsigned pagevec_lookup_range_tag(struct pagevec *pvec, diff --git a/mm/swap.c b/mm/swap.c index 1e6f50b312ea..3f856a272cb2 100644 --- a/mm/swap.c +++ b/mm/swap.c @@ -988,6 +988,34 @@ void __pagevec_release(struct pagevec *pvec) } EXPORT_SYMBOL(__pagevec_release); =20 +/** + * pagevec_alloc - Allocate a pagevec. + * @sz: Number of pages wanted. + * @gfp: Memory allocation flags. + * + * Allocates a new pagevec. The @sz parameter is advisory; this functio= n + * may allocate a pagevec that can contain fewer pages than requested. = If + * the caller cares how many were allocated, it can check pagevec_size()= , + * but most callers will simply use as many as were allocated. + * + * Return: A new pagevec, or NULL if memory allocation failed. + */ +struct pagevec *pagevec_alloc(unsigned long sz, gfp_t gfp) +{ + struct pagevec *pvec; + + if (sz > 255) + sz =3D 255; + pvec =3D kmalloc_array(sz + 1, sizeof(void *), gfp); + if (!pvec) + return NULL; + pvec->nr =3D 0; + pvec->sz =3D sz; + + return pvec; +} +EXPORT_SYMBOL(pagevec_alloc); + #ifdef CONFIG_TRANSPARENT_HUGEPAGE /* used by __split_huge_page_refcount() */ void lru_add_page_tail(struct page *page, struct page *page_tail, --=20 2.28.0