From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CF8892AE68; Mon, 30 Dec 2024 15:52:28 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735573948; cv=none; b=sfD/eBEqygy33Ld7mLGppT4LVY2x83HAVO87Z9WI7BD+iEOiDuBsb6gwBhkoIhMYbBa9zpk1t1u5GGXdNF5VmTOBmNiuJfdJVQZfsidEreLvBa0tjyD7gNhYE/j8mDPsKzlZsb6ymFzPcJtFRee9e6MkMjWCE5V0EMUP2CgdlwQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1735573948; c=relaxed/simple; bh=eTViMozMthhlSw3UYzBhgpqIc2jR+pTYChl9RDECKqU=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=qWSoKVya3l5vq04FiIZPkzUwItgxeqAMp3HnBbAqq1hcjgobXRHci7lo6EfMTWdWGQsqZ0z1RkIengntdSouFBQLdU/nhhQn6CBKy3ltTU/wtIIr2nc4Qi4RIY/zycNntgaUC4Nr1TL3omfDzdAxQHhXFvnmo8UCLh4dLdRwIKQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=S6gpea74; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="S6gpea74" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E4FDFC4CED0; Mon, 30 Dec 2024 15:52:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1735573948; bh=eTViMozMthhlSw3UYzBhgpqIc2jR+pTYChl9RDECKqU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=S6gpea74kuBXHHN6+AsNR8pR3+PdgtblKnAqsAxQTe3/QSeTdcxkkZBL7k6Le05TG 2GGgu5rdDsZDzC82D9nSWyhJj/AbACRlwg0ORgBoXnzTkTYJCEXop2UQiwyjekYGWv o8xWOaxdFuquBJMHmNi6Zf118/iCTt/Jmf1JbSJQ= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Qu Wenruo , Filipe Manana , David Sterba Subject: [PATCH 6.6 81/86] btrfs: avoid monopolizing a core when activating a swap file Date: Mon, 30 Dec 2024 16:43:29 +0100 Message-ID: <20241230154214.789085983@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241230154211.711515682@linuxfoundation.org> References: <20241230154211.711515682@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Filipe Manana commit 2c8507c63f5498d4ee4af404a8e44ceae4345056 upstream. During swap activation we iterate over the extents of a file and we can have many thousands of them, so we can end up in a busy loop monopolizing a core. Avoid this by doing a voluntary reschedule after processing each extent. CC: stable@vger.kernel.org # 5.4+ Reviewed-by: Qu Wenruo Signed-off-by: Filipe Manana Signed-off-by: David Sterba Signed-off-by: Greg Kroah-Hartman --- fs/btrfs/inode.c | 2 ++ 1 file changed, 2 insertions(+) --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -7153,6 +7153,8 @@ noinline int can_nocow_extent(struct ino ret = -EAGAIN; goto out; } + + cond_resched(); } if (orig_start)