From patchwork Mon Jul 12 18:57:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chuck Lever X-Patchwork-Id: 12371863 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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 3175AC07E99 for ; Mon, 12 Jul 2021 18:57:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1597C611AD for ; Mon, 12 Jul 2021 18:57:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233344AbhGLTAf (ORCPT ); Mon, 12 Jul 2021 15:00:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:54244 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230409AbhGLTAf (ORCPT ); Mon, 12 Jul 2021 15:00:35 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id E2D656120A; Mon, 12 Jul 2021 18:57:46 +0000 (UTC) Subject: [PATCH v4 0/3] Bulk-release pages during NFSD read splice From: Chuck Lever To: linux-nfs@vger.kernel.org, linux-mm@kvack.org Cc: neilb@suse.de Date: Mon, 12 Jul 2021 14:57:46 -0400 Message-ID: <162611520339.1416.14646909890289253420.stgit@klimt.1015granger.net> User-Agent: StGit/1.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-nfs@vger.kernel.org As with the page allocation side, I'm trying to reduce the average number of times NFSD invokes the page allocation and release APIs because they can be expensive, and because it is a resource that is shared amongst all nfsd threads and thus access to it is at least partially serialized. This small series tackles a code path that is frequently invoked when NFSD handles READ operations on local filesystems that support splice (i.e., most of the popular ones). Changes since v3: - Mark patches 1 and 3 as Reviewed-by: Neil Brown - Convert bare release_pages() calls to pagevec_release() - Release accrued free pages after every RPC retires --- Chuck Lever (3): NFSD: Clean up splice actor SUNRPC: Add svc_rqst_replace_page() API NFSD: Batch release pages during splice read fs/nfsd/vfs.c | 20 +++++--------------- include/linux/sunrpc/svc.h | 4 ++++ net/sunrpc/svc.c | 21 +++++++++++++++++++++ net/sunrpc/svc_xprt.c | 3 +++ 4 files changed, 33 insertions(+), 15 deletions(-) -- Chuck Lever