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=-18.9 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_GIT autolearn=ham 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 2AE15C48BD1 for ; Thu, 10 Jun 2021 13:00:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0DA52613DE for ; Thu, 10 Jun 2021 13:00:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230448AbhFJNCB (ORCPT ); Thu, 10 Jun 2021 09:02:01 -0400 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:31971 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230153AbhFJNCA (ORCPT ); Thu, 10 Jun 2021 09:02:00 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1623330003; 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=I22vQVb/zbb8RGd4i8mqG/15RAizB0sQcCdNo+kxdtc=; b=CBICXaEtcDQn8URPluzX5B7JC9ypaaV+26L6tdmfJTl64FAoWnl96PaUrT4zBqJjuQ/r5p BahrAQwSsV6QWkQxO5cBCap7Nnb6ymYDoK6VW9stEr5dfbj0HavLFapUt9+CS+wksq6nRc Ewqb+GRqaAzd1SsnGenfQvgOC/WDOgM= Received: from mail-wr1-f70.google.com (mail-wr1-f70.google.com [209.85.221.70]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-365-Od8WHfSqPuyIC5oXzjOrLg-1; Thu, 10 Jun 2021 09:00:01 -0400 X-MC-Unique: Od8WHfSqPuyIC5oXzjOrLg-1 Received: by mail-wr1-f70.google.com with SMTP id s8-20020adff8080000b0290114e1eeb8c6so843133wrp.23 for ; Thu, 10 Jun 2021 06:00:00 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=I22vQVb/zbb8RGd4i8mqG/15RAizB0sQcCdNo+kxdtc=; b=LXPwefgbkAYY1uP+v4uKF5yjHivbRHWO9/S93YiD8HXyBmo8m4tZbDhEzV/v2JT9Do dp09aH9qMzjoDIKQUGXEW9pyOjEJty3NaE5ujrdz1p47AabcYNj7ORklJFGHMSt3sIoY 4COKfjKe29GR3FWQbhWFA0k4Tu7pJ8L+Hp4RY3JBy2mOpIDaVpoD8bIzPKoF3PvAA09v 8S+dgNpdI45uQTqV/SasvzGkDrcuTN6W+7m1HyEy3IpzDpBOr6Wxz9eno9FqF+MA9OYs QJL+O3RLQ5cGsl3iSWfxEU0Ii+fNsnCrYe64gtK8pK7LOS0/ejqQTt8wmL2vlxUdwGil BJSg== X-Gm-Message-State: AOAM532ugd+QUOdhW+so3V4QzeEXR0axBStpnZMZMK0tcV9f8Yw1aAI1 xP97zzlM3YxHlovAC4kKk+kp0n9/6VNnZ7OfqpMlIODoJx02qZZuXdATMXRNGXIfvfm2AGLgudv Vqev/ZY7zlKMSmiPH6WhIS61BSMEDtVJlabRqUAIlSenFJLGTfetZ2Th7bsrFu4jSJ87BUGHgLV v23XE= X-Received: by 2002:a05:6000:551:: with SMTP id b17mr5307538wrf.32.1623329999936; Thu, 10 Jun 2021 05:59:59 -0700 (PDT) X-Google-Smtp-Source: ABdhPJzBsh6Ss44tlc5bWZ2BoYoiZN6+SPxpSCaCiuL6HObk+t3x4HLarFcVoY+xaCbNIsdHHvXDNg== X-Received: by 2002:a05:6000:551:: with SMTP id b17mr5307521wrf.32.1623329999770; Thu, 10 Jun 2021 05:59:59 -0700 (PDT) Received: from vian.redhat.com ([2a0c:5a80:3d14:2800:933d:abfc:d8e4:637f]) by smtp.gmail.com with ESMTPSA id p6sm3623615wrf.51.2021.06.10.05.59.59 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 10 Jun 2021 05:59:59 -0700 (PDT) From: Nicolas Saenz Julienne To: linux-rt-users@vger.kernel.org, frederic@kernel.org Cc: tglx@linutronix.de, mtosatti@redhat.com, Nicolas Saenz Julienne Subject: [RFC 1/2] timers: Add pending timer bool in struct timer_base Date: Thu, 10 Jun 2021 14:59:44 +0200 Message-Id: <20210610125945.558872-1-nsaenzju@redhat.com> X-Mailer: git-send-email 2.31.1 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org We need to efficiently check whether a timer base has no pending events. So introduce a new variable in struct timer_base to do so. Signed-off-by: Nicolas Saenz Julienne --- kernel/time/timer.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/kernel/time/timer.c b/kernel/time/timer.c index 4f7602724f9a..2d7d68296a3b 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -201,6 +201,7 @@ struct timer_base { #ifdef CONFIG_PREEMPT_RT spinlock_t expiry_lock; atomic_t timer_waiters; + bool pending; #endif unsigned long clk; unsigned long next_expiry; @@ -596,6 +597,9 @@ static void enqueue_timer(struct timer_base *base, struct timer_list *timer, */ base->next_expiry = bucket_expiry; base->next_expiry_recalc = false; +#ifdef CONFIG_PREEMPT_RT + base->pending = true; +#endif trigger_dyntick_cpu(base, timer); } } @@ -1598,6 +1602,9 @@ static unsigned long __next_timer_interrupt(struct timer_base *base) } base->next_expiry_recalc = false; +#ifdef CONFIG_PREEMPT_RT + base->pending = (next != base->clk + NEXT_TIMER_MAX_DELTA); +#endif return next; } @@ -1966,6 +1973,9 @@ int timers_prepare_cpu(unsigned int cpu) base->clk = jiffies; base->next_expiry = base->clk + NEXT_TIMER_MAX_DELTA; base->is_idle = false; +#ifdef CONFIG_PREEMPT_RT + base->pending = false; +#endif } return 0; } -- 2.31.1