From nobody Sat Oct 4 14:10:42 2025 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 076C1BE46; Sat, 16 Aug 2025 00:08:40 +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=1755302920; cv=none; b=olrHzQZzFLdIlsgIpMWH2DeOk9RBqWWKdkuJ6yUY9qNvMsH2aHCcWZ5jHO9X5zEd4OwUVcfNkjsdawWIIYzScd/SVl7BMVw/r9NPZjwD9u2ZOttyCZxhsy1Cy5pRrMOeGG2mEiSyU3QjAKKNM7arTMkiexFOHpm/m+2Xsap4MGE= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755302920; c=relaxed/simple; bh=QRMj3cfejFshQ8gBkMpPIHQRTiBKhfo6s4NoeWXO8TE=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=E3R5CIu+GYRDGdJLdc2CrweRYj22aR8183S+cnU4DHwf7h1wT1sgg5b/5UlOg6Fwo2/XwVChIBDyncYFSPHmRl23kH//GmX4CLyikrYjXX786XqnRlFBzYdWX0u2UL4Nq1C05BzsE3dmf0SUmnFe4cmozXGsoBULTXsCT8caZH4= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=LQQ6jMrw; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="LQQ6jMrw" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D4A61C4CEF5; Sat, 16 Aug 2025 00:08:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1755302919; bh=QRMj3cfejFshQ8gBkMpPIHQRTiBKhfo6s4NoeWXO8TE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=LQQ6jMrwTMk5BIj++yBMB1liZSzWDXLOTQaC2LXspZGdoJx4AxkJLXsBf2zFgYvtA AQYk2oCB1nVVUDlLZJZg43uzoIa7gKtj7SXObCmDPQg+niLwmHJc985vcO0iDJNlSv DqIt5+g/iT+7KZ9buOyy6xkXgZjvmlcgwVmT+iGEhHlBlTyb7VdV6/H6+xIpJu0+mm rXHDjiyv+JHe+kdsu17znIZ6ocUbIl0kKa/pQXxTD3QdL2EmtV6wUGy2X3GrAdYw30 802/TzffghkF9prHZl3IylMcjh94XEafXZrcwYU21sUw+LCRG2rq15wtA2q9/UQ8fE qFawTKfHYi76Q== Received: by paulmck-ThinkPad-P17-Gen-1.home (Postfix, from userid 1000) id 1ADF2CE0B6D; Fri, 15 Aug 2025 17:08:39 -0700 (PDT) From: "Paul E. McKenney" To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@meta.com, rostedt@goodmis.org, "Paul E. McKenney" Subject: [PATCH 4/7] rcutorture: Suppress "Writer stall state" reports during boot Date: Fri, 15 Aug 2025 17:08:34 -0700 Message-Id: <20250816000837.2622858-4-paulmck@kernel.org> X-Mailer: git-send-email 2.40.1 In-Reply-To: <8758bcc6-901f-4828-b2fc-aa9f90e85451@paulmck-laptop> References: <8758bcc6-901f-4828-b2fc-aa9f90e85451@paulmck-laptop> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" When rcutorture is running on only the one boot-time CPU while that CPU is busy invoking initcall() functions, the added load is quite likely to unduly delay the RCU grace-period kthread, rcutorture readers, and much else besides. This can result in rcu_torture_stats_print() reporting rcutorture writer stalls, which are not really a bug in that environment. After all, one CPU can only do so much. This commit therefore suppresses rcutorture writer stalls while the kernel is booting, that is, while rcu_inkernel_boot_has_ended() continues returning false. Signed-off-by: Paul E. McKenney --- kernel/rcu/rcutorture.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/rcutorture.c b/kernel/rcu/rcutorture.c index 7a893d51d02b6a..49e048da4f6810 100644 --- a/kernel/rcu/rcutorture.c +++ b/kernel/rcu/rcutorture.c @@ -2756,7 +2756,8 @@ rcu_torture_stats_print(void) cur_ops->stats(); if (rtcv_snap =3D=3D rcu_torture_current_version && rcu_access_pointer(rcu_torture_current) && - !rcu_stall_is_suppressed()) { + !rcu_stall_is_suppressed() && + rcu_inkernel_boot_has_ended()) { int __maybe_unused flags =3D 0; unsigned long __maybe_unused gp_seq =3D 0; =20 --=20 2.40.1