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 X-Spam-Level: X-Spam-Status: No, score=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9CF07C2D0E5 for ; Fri, 27 Mar 2020 22:25:43 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6D2CD2073B for ; Fri, 27 Mar 2020 22:25:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585347943; bh=mCZgb7DLDa9iRGQSrkVQ/UNKgd0DFXuZwivFK+V0VE8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=eVccrj1nEknFRADCx2B7YtR+0r9IZAIhirFkNFmM4EgWFndBBDc1AruQcNdzDmulo TK1jqZ2bCjiAM9fbxzP6JksyLu+iUL5j32x0GlCUrIuomAwJzyzO8bYc4P3wE9c+Y+ in7thfV2C4dQLjhlIrZW2Un6S4SjMabyXfIXCA+E= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727714AbgC0WZh (ORCPT ); Fri, 27 Mar 2020 18:25:37 -0400 Received: from mail.kernel.org ([198.145.29.99]:43554 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727805AbgC0WZK (ORCPT ); Fri, 27 Mar 2020 18:25:10 -0400 Received: from paulmck-ThinkPad-P72.home (50-39-105-78.bvtn.or.frontiernet.net [50.39.105.78]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id B75E821924; Fri, 27 Mar 2020 22:25:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1585347910; bh=mCZgb7DLDa9iRGQSrkVQ/UNKgd0DFXuZwivFK+V0VE8=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=mwaPSxNHLKkSXXN+Jy+WJvj/EHo+42D2l//S3LPIri8dXBhCRsCYdkffCqH3Lk9kk HnNMSt79SjhgCdZtsg/mO63qoE3koHCMiMQnqtcC/lh01KLtLnXR0HeXBOKW/mJaNk JtsMtUAef+A8Ci8XmSJVDwJfsuGftEgq5OH1h6mE= From: paulmck@kernel.org To: rcu@vger.kernel.org Cc: linux-kernel@vger.kernel.org, kernel-team@fb.com, mingo@kernel.org, jiangshanlai@gmail.com, dipankar@in.ibm.com, akpm@linux-foundation.org, mathieu.desnoyers@efficios.com, josh@joshtriplett.org, tglx@linutronix.de, peterz@infradead.org, rostedt@goodmis.org, dhowells@redhat.com, edumazet@google.com, fweisbec@gmail.com, oleg@redhat.com, joel@joelfernandes.org, "Paul E. McKenney" Subject: [PATCH v3 tip/core/rcu 34/34] rcu-tasks: Add IPI failure count to statistics Date: Fri, 27 Mar 2020 15:24:56 -0700 Message-Id: <20200327222456.12470-34-paulmck@kernel.org> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20200327222346.GA12082@paulmck-ThinkPad-P72> References: <20200327222346.GA12082@paulmck-ThinkPad-P72> Sender: rcu-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: rcu@vger.kernel.org From: "Paul E. McKenney" This commit adds a failure-return count for smp_call_function_single(), and adds this to the console messages for rcutorture writer stalls and at the end of rcutorture testing. Signed-off-by: Paul E. McKenney --- kernel/rcu/tasks.h | 11 +++++++---- 1 file changed, 7 insertions(+), 4 deletions(-) diff --git a/kernel/rcu/tasks.h b/kernel/rcu/tasks.h index 06fe0c4..9c65e78 100644 --- a/kernel/rcu/tasks.h +++ b/kernel/rcu/tasks.h @@ -32,6 +32,7 @@ typedef void (*postgp_func_t)(struct rcu_tasks *rtp); * @gp_start: Most recent grace-period start in jiffies. * @n_gps: Number of grace periods completed since boot. * @n_ipis: Number of IPIs sent to encourage grace periods to end. + * @n_ipis_fails: Number of IPI-send failures. * @pregp_func: This flavor's pre-grace-period function (optional). * @pertask_func: This flavor's per-task scan function (optional). * @postscan_func: This flavor's post-task scan function (optional). @@ -51,6 +52,7 @@ struct rcu_tasks { unsigned long gp_start; unsigned long n_gps; unsigned long n_ipis; + unsigned long n_ipis_fails; struct task_struct *kthread_ptr; rcu_tasks_gp_func_t gp_func; pregp_func_t pregp_func; @@ -290,12 +292,12 @@ static void __init rcu_tasks_bootup_oddness(void) /* Dump out rcutorture-relevant state common to all RCU-tasks flavors. */ static void show_rcu_tasks_generic_gp_kthread(struct rcu_tasks *rtp, char *s) { - pr_info("%s: %s(%d) since %lu g:%lu i:%lu %c%c %s\n", + pr_info("%s: %s(%d) since %lu g:%lu i:%lu/%lu %c%c %s\n", rtp->kname, - tasks_gp_state_getname(rtp), - data_race(rtp->gp_state), + tasks_gp_state_getname(rtp), data_race(rtp->gp_state), jiffies - data_race(rtp->gp_jiffies), - data_race(rtp->n_gps), data_race(rtp->n_ipis), + data_race(rtp->n_gps), + data_race(rtp->n_ipis_fails), data_race(rtp->n_ipis), ".k"[!!data_race(rtp->kthread_ptr)], ".C"[!!data_race(rtp->cbs_head)], s); @@ -905,6 +907,7 @@ static void trc_wait_for_one_reader(struct task_struct *t, trc_read_check_handler, t, 0)) { // Just in case there is some other reason for // failure than the target CPU being offline. + rcu_tasks_trace.n_ipis_fails++; per_cpu(trc_ipi_to_cpu, cpu) = false; t->trc_ipi_to_cpu = cpu; if (atomic_dec_and_test(&trc_n_readers_need_end)) { -- 2.9.5