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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7EF91C433EF for ; Fri, 18 Mar 2022 18:58:36 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id D3D058D0002; Fri, 18 Mar 2022 14:58:35 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id CEC388D0001; Fri, 18 Mar 2022 14:58:35 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id B8C5F8D0002; Fri, 18 Mar 2022 14:58:35 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0077.hostedemail.com [216.40.44.77]) by kanga.kvack.org (Postfix) with ESMTP id A69B38D0001 for ; Fri, 18 Mar 2022 14:58:35 -0400 (EDT) Received: from smtpin21.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 5CA3A1828A811 for ; Fri, 18 Mar 2022 18:58:35 +0000 (UTC) X-FDA: 79258418190.21.1F458A0 Received: from mail-lf1-f49.google.com (mail-lf1-f49.google.com [209.85.167.49]) by imf26.hostedemail.com (Postfix) with ESMTP id 0CBC2140025 for ; Fri, 18 Mar 2022 18:58:34 +0000 (UTC) Received: by mail-lf1-f49.google.com with SMTP id p15so4781008lfk.8 for ; Fri, 18 Mar 2022 11:58:34 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux-foundation.org; s=google; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=ZDmW+p2ypjT1HjKWJx8fh+7ifv3HKZNMXtvuE6nm2qs=; b=XHm5zI8ZBbpkWBIg6jHxN78K61Pegw6nnLu5ZR3iY8VEia03dmDXc3bRlF28jroE23 doUqgjtYjvMH/budaSJuXxwTsP9wm1X3caE0hvtLwEj1Yzt9y1nJKLAZWQpSC1IyN0hj mypuoFL+N7hevvkbbmj5/rf2VzcZF7ajqMqyI= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=x-gm-message-state:mime-version:references:in-reply-to:from:date :message-id:subject:to:cc; bh=ZDmW+p2ypjT1HjKWJx8fh+7ifv3HKZNMXtvuE6nm2qs=; b=HtpfhQXzU3wp6xP1Bxauz9AqpXsv/a0ibezF29yTXZ0mDyoR/NKI4VJOqwuKK6FqGi PLbWk7vNzUAAjWA/xTMH58syocFxO0dLUxCSfcjnehaZ9p4vc413nFZhBpeM124dZ9mw 3SWDXroV2Io1gJYy/LPBSmLMvDeCd0vaYFKLGpWzzVCf2IWcNIDcv2U/brMOVvdDGOJv P5ipzJpYqrCD3hFG1IsFqB0mufg0ThOOWuYbAFG0UjJ0g35dqrwnjUkc9lWNAbxIfBiB /Ks5HsB8HP/tnOH0xk/nxCzl49pX+yy/pEiqFKcYrxigXvsYxLkAIMB1jf+Mf020p3ML NFpQ== X-Gm-Message-State: AOAM5312TTufdfHsDx62WY5hC8XguE0di5A32f2KGXJRraFW7WauMrI3 vn49LGf9x6YPmlSz8+wyMqmPFtsj4m32lf2pke4= X-Google-Smtp-Source: ABdhPJyAtYEuhdhEdenDbtUhiTvgnQXZgsJtttQVekcNOfOPrzGf9TQAcrc7zkx/S9N1AvmqihOX/g== X-Received: by 2002:a05:6512:b81:b0:448:b342:513c with SMTP id b1-20020a0565120b8100b00448b342513cmr6666323lfv.257.1647629913256; Fri, 18 Mar 2022 11:58:33 -0700 (PDT) Received: from mail-lj1-f179.google.com (mail-lj1-f179.google.com. [209.85.208.179]) by smtp.gmail.com with ESMTPSA id p1-20020a05651238c100b004435d1d47fasm969268lft.102.2022.03.18.11.58.31 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 18 Mar 2022 11:58:31 -0700 (PDT) Received: by mail-lj1-f179.google.com with SMTP id u3so12524552ljd.0 for ; Fri, 18 Mar 2022 11:58:31 -0700 (PDT) X-Received: by 2002:a2e:a78f:0:b0:249:21ce:6d53 with SMTP id c15-20020a2ea78f000000b0024921ce6d53mr6973185ljf.164.1647629910974; Fri, 18 Mar 2022 11:58:30 -0700 (PDT) MIME-Version: 1.0 References: In-Reply-To: From: Linus Torvalds Date: Fri, 18 Mar 2022 11:58:14 -0700 X-Gmail-Original-Message-ID: Message-ID: Subject: Re: writeback completion soft lockup BUG in folio_wake_bit() To: Matthew Wilcox Cc: Brian Foster , Linux-MM , linux-fsdevel , linux-xfs , Hugh Dickins Content-Type: text/plain; charset="UTF-8" X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 0CBC2140025 X-Stat-Signature: b3kdrjc1k49149w6pnora9ogejc9z1os Authentication-Results: imf26.hostedemail.com; dkim=pass header.d=linux-foundation.org header.s=google header.b=XHm5zI8Z; dmarc=none; spf=pass (imf26.hostedemail.com: domain of torvalds@linuxfoundation.org designates 209.85.167.49 as permitted sender) smtp.mailfrom=torvalds@linuxfoundation.org X-Rspam-User: X-HE-Tag: 1647629914-57436 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: On Fri, Mar 18, 2022 at 7:45 AM Matthew Wilcox wrote: > > Excellent! I'm going to propose these two patches for -rc1 (I don't > think we want to be playing with this after -rc8) Ack. I think your commit message may be a bit too optimistic (who knows if other loads can trigger the over-long page locking wait-queue latencies), but since I don't see any other ways to really check this than just trying it, let's do it. Linus