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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 2BC1DC433F5 for ; Thu, 24 Mar 2022 22:12:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1355261AbiCXWN7 (ORCPT ); Thu, 24 Mar 2022 18:13:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42440 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240339AbiCXWN6 (ORCPT ); Thu, 24 Mar 2022 18:13:58 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id BA1F8AF1D3 for ; Thu, 24 Mar 2022 15:12:25 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1648159944; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=kVBjsNb2VDJLwgcDZYe43jQSQ0QHWlb+IMiUnQWI++k=; b=Xjir/MOWTkMQQWhbf4+lec1P10/pPTlhY4Uz+8OGrkiVaMjDYB6CarcAQSZMJ+Nw8ndGhD ccwNYNd9KVTeJBlFEn+GFb0s38YEZXdIwcRPb7emmsS/N52J99XR7T0rgTMnnIO/AidSeU 6mtjhLus/zkmKSbDcGtbo+cF2Hulf3s= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-479-mogqiX2INry9iokN0gUTXw-1; Thu, 24 Mar 2022 18:12:18 -0400 X-MC-Unique: mogqiX2INry9iokN0gUTXw-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E77CD381D8A0; Thu, 24 Mar 2022 22:12:17 +0000 (UTC) Received: from jsavitz-csb.redhat.com (unknown [10.22.33.7]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9CA8E40E7F02; Thu, 24 Mar 2022 22:12:15 +0000 (UTC) From: Joel Savitz To: linux-kernel@vger.kernel.org Cc: Joel Savitz , Jonathan Corbet , Andrew Morton , Huang Ying , Eric Biggers , Dominik Brodowski , Mauro Carvalho Chehab , Rasmus Villemoes , "Jason A. Donenfeld" , Daniel Borkmann , Rob Herring , Wang Qing , linux-doc@vger.kernel.org Subject: [PATCH] Documentation/sysctl: document max_rcu_stall_to_panic Date: Thu, 24 Mar 2022 18:11:56 -0400 Message-Id: <20220324221156.44813-1-jsavitz@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.84 on 10.11.54.1 Precedence: bulk List-ID: X-Mailing-List: linux-doc@vger.kernel.org commit dfe564045c65 ("rcu: Panic after fixed number of stalls") introduced a new systctl but no accompanying documentation. Add a simple entry to the documentation. Signed-off-by: Joel Savitz --- Documentation/admin-guide/sysctl/kernel.rst | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/Documentation/admin-guide/sysctl/kernel.rst b/Documentation/admin-guide/sysctl/kernel.rst index 803c60bf21d3..4e48139b9a34 100644 --- a/Documentation/admin-guide/sysctl/kernel.rst +++ b/Documentation/admin-guide/sysctl/kernel.rst @@ -781,6 +781,13 @@ is useful to define the root cause of RCU stalls using a vmcore. 1 panic() after printing RCU stall messages. = ============================================================ +max_rcu_stall_to_panic +====================== + +When ``panic_on_rcu_stall`` is set to 1, this value determines the +number of times that RCU can stall before panic() is called. + +When ``panic_on_rcu_stall`` is set to 0, this value is has no effect. perf_cpu_time_max_percent ========================= -- 2.27.0