From nobody Fri Dec 19 16:01:18 2025 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 274FDFA374B for ; Mon, 24 Oct 2022 14:20:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S237140AbiJXOT5 (ORCPT ); Mon, 24 Oct 2022 10:19:57 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36906 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235047AbiJXOO1 (ORCPT ); Mon, 24 Oct 2022 10:14:27 -0400 Received: from dfw.source.kernel.org (dfw.source.kernel.org [IPv6:2604:1380:4641:c500::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF6353054C; Mon, 24 Oct 2022 05:54:15 -0700 (PDT) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by dfw.source.kernel.org (Postfix) with ESMTPS id 831DC612CE; Mon, 24 Oct 2022 12:36:53 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 91860C433B5; Mon, 24 Oct 2022 12:36:52 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1666615012; bh=bEmBgl0GT+2D0DUgIZWHRCQpwTRsSlgOSVEiO/oYD9k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OcsS2iVdwDzoyp4tbYs7qJLjlIxy+OHh08sA7cohR3OEpjHQpNRmhntofg9A2ecVF HnW/vj0OL23vLU9ejTMSwZnZu7bw1kNJFBxQDUW81TcEDkHhgQzgo6pQpMu6yU70AU b6YVDb1ecuF0GynMxLZNnX2ktL9RuhkFblHwgd1M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, stable@kernel.org, Alexey Lyashkov , "Ritesh Harjani (IBM)" , Theodore Tso Subject: [PATCH 5.15 088/530] jbd2: wake up journal waiters in FIFO order, not LIFO Date: Mon, 24 Oct 2022 13:27:12 +0200 Message-Id: <20221024113048.989359615@linuxfoundation.org> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221024113044.976326639@linuxfoundation.org> References: <20221024113044.976326639@linuxfoundation.org> User-Agent: quilt/0.67 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Andrew Perepechko commit 34fc8768ec6089565d6d73bad26724083cecf7bd upstream. LIFO wakeup order is unfair and sometimes leads to a journal user not being able to get a journal handle for hundreds of transactions in a row. FIFO wakeup can make things more fair. Cc: stable@kernel.org Signed-off-by: Alexey Lyashkov Reviewed-by: Ritesh Harjani (IBM) Link: https://lore.kernel.org/r/20220907165959.1137482-1-alexey.lyashkov@gm= ail.com Signed-off-by: Theodore Ts'o Signed-off-by: Greg Kroah-Hartman --- fs/jbd2/commit.c | 2 +- fs/jbd2/transaction.c | 6 +++--- 2 files changed, 4 insertions(+), 4 deletions(-) --- a/fs/jbd2/commit.c +++ b/fs/jbd2/commit.c @@ -581,7 +581,7 @@ void jbd2_journal_commit_transaction(jou journal->j_running_transaction =3D NULL; start_time =3D ktime_get(); commit_transaction->t_log_start =3D journal->j_head; - wake_up(&journal->j_wait_transaction_locked); + wake_up_all(&journal->j_wait_transaction_locked); write_unlock(&journal->j_state_lock); =20 jbd_debug(3, "JBD2: commit phase 2a\n"); --- a/fs/jbd2/transaction.c +++ b/fs/jbd2/transaction.c @@ -173,7 +173,7 @@ static void wait_transaction_locked(jour int need_to_start; tid_t tid =3D journal->j_running_transaction->t_tid; =20 - prepare_to_wait(&journal->j_wait_transaction_locked, &wait, + prepare_to_wait_exclusive(&journal->j_wait_transaction_locked, &wait, TASK_UNINTERRUPTIBLE); need_to_start =3D !tid_geq(journal->j_commit_request, tid); read_unlock(&journal->j_state_lock); @@ -199,7 +199,7 @@ static void wait_transaction_switching(j read_unlock(&journal->j_state_lock); return; } - prepare_to_wait(&journal->j_wait_transaction_locked, &wait, + prepare_to_wait_exclusive(&journal->j_wait_transaction_locked, &wait, TASK_UNINTERRUPTIBLE); read_unlock(&journal->j_state_lock); /* @@ -911,7 +911,7 @@ void jbd2_journal_unlock_updates (journa write_lock(&journal->j_state_lock); --journal->j_barrier_count; write_unlock(&journal->j_state_lock); - wake_up(&journal->j_wait_transaction_locked); + wake_up_all(&journal->j_wait_transaction_locked); } =20 static void warn_dirty_buffer(struct buffer_head *bh)