From patchwork Mon Jan 31 04:03:53 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: NeilBrown X-Patchwork-Id: 539016 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 44E50C4332F for ; Mon, 31 Jan 2022 04:04:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1357521AbiAaEEI (ORCPT ); Sun, 30 Jan 2022 23:04:08 -0500 Received: from smtp-out2.suse.de ([195.135.220.29]:38096 "EHLO smtp-out2.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S237371AbiAaEEH (ORCPT ); Sun, 30 Jan 2022 23:04:07 -0500 Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by smtp-out2.suse.de (Postfix) with ESMTPS id F2A5D1F37B; Mon, 31 Jan 2022 04:04:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_rsa; t=1643601846; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=a1hKKv4tQs0IkB2xFQLDfa5QVFGb4OvJBNqopkGrr6k=; b=fiVkEAwxRDflObUldBuKWNJQJVCMu9eTTko+720oBoKH20RkmraMDCjs0Iy00tjy/uphUk 128iAjXpmRCycvT2drQM/OATXxz69rsiprFbeB2pPwa9L9eR8aiP2KJRgd4bmESc8+RqhM 0lrloqgzFrVvw8R08CSdyUMX4lq4gLg= DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de; s=susede2_ed25519; t=1643601846; h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc: mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding; bh=a1hKKv4tQs0IkB2xFQLDfa5QVFGb4OvJBNqopkGrr6k=; b=uob4sOy+PK8E9TZ09Wj6Bhv0xAVwnyLeFUUFdeVvKXtH0q63G8ED3ptWJSVL4uJG3uhlu4 DO1m665lXtn3d/Cw== Received: from imap2.suse-dmz.suse.de (imap2.suse-dmz.suse.de [192.168.254.74]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-521) server-digest SHA512) (No client certificate requested) by imap2.suse-dmz.suse.de (Postfix) with ESMTPS id B1220133A4; Mon, 31 Jan 2022 04:04:02 +0000 (UTC) Received: from dovecot-director2.suse.de ([192.168.254.65]) by imap2.suse-dmz.suse.de with ESMTPSA id B7tCG7Jf92GMCQAAMHmgww (envelope-from ); Mon, 31 Jan 2022 04:04:02 +0000 Subject: [PATCH 0/3] remove dependence of inode_congested() From: NeilBrown To: Andrew Morton , Jeff Layton , Ilya Dryomov , Miklos Szeredi , Trond Myklebust , Anna Schumaker Cc: linux-mm@kvack.org, linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org, ceph-devel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 31 Jan 2022 15:03:53 +1100 Message-ID: <164360127045.4233.2606812444285122570.stgit@noble.brown> User-Agent: StGit/0.23 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org Miklos pointed out that the filesystems which set the bdi congestion flags do gain some value from that, and simply removing the code is not appropriate. Specifically, readahead and/or writeback are skipped when the congestion flags are set. We can mostly move this skipping into the filesystem. ->readahead can do nothing if reads are congested. ->writepage and ->wrtepages can do nothing for WB_SYNC_NONE if writes are congested. Currently only *some* WB_SYNC_NONE writes are skipped due to congestion. Those from sync_file_range() and those used for page migration are not. Also, shrink_page_list() will now cause PageActive to be set if ->writepage skips due to congestion. I don't expect these changes to be a problem, but I have no experience to base that on. Review/comments most welcome, Thanks, NeilBrown --- NeilBrown (3): fuse: remove reliance on bdi congestion nfs: remove reliance on bdi congestion ceph: remove reliance on bdi congestion fs/ceph/addr.c | 22 +++++++++++++--------- fs/ceph/super.c | 1 + fs/ceph/super.h | 1 + fs/nfs/write.c | 12 ++++++++++-- include/linux/nfs_fs_sb.h | 1 + 5 files changed, 26 insertions(+), 11 deletions(-) -- Signature