From nobody Sun Feb 8 13:39:17 2026 Received: from galois.linutronix.de (Galois.linutronix.de [193.142.43.55]) (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 D02AE156977; Thu, 22 Feb 2024 17:12:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=193.142.43.55 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708621935; cv=none; b=cMAlbAyQ4NxxjdANAiEi66ScYdZ/nGg74ZuchbIFcYgCFopAPV41JMBjsYeMO5I3eIx6+d9M7DijdW/ipK50JstPt702lKKtX4BcRnvvk9t5SsBnARt/9NfZh6oz0R3TZ+0veDgNuRvnLcy7qfVvC9Fb+i3kQNgIOQeQlfNcIck= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708621935; c=relaxed/simple; bh=Tbck2OMqtLJUFG6B2k0J2BfnbExTjzQ8EJQcoxcR7eA=; h=Date:From:To:Subject:Cc:In-Reply-To:References:MIME-Version: Message-ID:Content-Type; b=qZz++zElWsv+4nBHcvmvONii0MevClS6JPct2595wBblhOG292ImEmmrJSm+cb7+c8B3HnAhs7oWjvPS6x8iSYYKm8+8CEn8qGcSfcFAeRwR+QOzvfMbCpN1hzwgtoygabfHiveDZymlTedxOem1OUz7Ox44FOufIHTxFWPrKbc= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de; spf=pass smtp.mailfrom=linutronix.de; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=tKkEBarM; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b=4l4M/u0/; arc=none smtp.client-ip=193.142.43.55 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linutronix.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linutronix.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="tKkEBarM"; dkim=permerror (0-bit key) header.d=linutronix.de header.i=@linutronix.de header.b="4l4M/u0/" Date: Thu, 22 Feb 2024 17:12:10 -0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020; t=1708621931; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=p4BrntYQ08Z67ifw3gui6IDhNOebTMArcG18q33unck=; b=tKkEBarMI7uLagMQ7OgS/AducXbo/xoKQdtBDaOqZrTLgrpf7q8IWkaLb8p55DVfwXlrzM QuZDeKbABAhbKr+jseZpM/Q+wo74ryKwHQ6+qITg3KPcTeRdj+MG8sTFWjqIrzRF8NsS4J bjU1EcTIvyDqD+EQ2SJXZ0Qr1+PjDew8Bz/0cAFs4L4wUh1mNI06VoM78VUce0YVCXaV/I kW023K6T23wlj2DWFG3OAHJCRnIcMOVijlsja27AxJfUBN7YWstocclZfVWle9n9XHm//3 T8qiUrdRfvpigS13txSPgzlKXkWQ90oWoxuuNyAaAkgajgi/wCFklfROa/1Q2w== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1708621931; h=from:from:sender:sender:reply-to:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=p4BrntYQ08Z67ifw3gui6IDhNOebTMArcG18q33unck=; b=4l4M/u0/oh2muLQKWo5BFbti9cA08HmKQkCCzkti89DatmvaMFoZ6YHgqOdCBXzvdBd5HS UJCGI7CRgBmWxMCg== From: "tip-bot2 for Anna-Maria Behnsen" Sender: tip-bot2@linutronix.de Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: timers/core] timers: Retrieve next expiry of pinned/non-pinned timers separately Cc: "Richard Cochran (linutronix GmbH)" , "Anna-Maria Behnsen" , Thomas Gleixner , Frederic Weisbecker , x86@kernel.org, linux-kernel@vger.kernel.org In-Reply-To: <20240221090548.36600-12-anna-maria@linutronix.de> References: <20240221090548.36600-12-anna-maria@linutronix.de> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Message-ID: <170862193062.398.4118896358715520378.tip-bot2@tip-bot2> Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Precedence: bulk Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable The following commit has been merged into the timers/core branch of tip: Commit-ID: 21927fc89e5feebc1f7cbf50bb58b81d776a62b4 Gitweb: https://git.kernel.org/tip/21927fc89e5feebc1f7cbf50bb58b81d7= 76a62b4 Author: Anna-Maria Behnsen AuthorDate: Wed, 21 Feb 2024 10:05:39 +01:00 Committer: Thomas Gleixner CommitterDate: Thu, 22 Feb 2024 17:52:31 +01:00 timers: Retrieve next expiry of pinned/non-pinned timers separately For the conversion of the NOHZ timer placement to a pull at expiry time model it's required to have separate expiry times for the pinned and the non-pinned (movable) timers. Therefore struct timer_events is introduced. No functional change Originally-by: Richard Cochran (linutronix GmbH) Signed-off-by: Anna-Maria Behnsen Signed-off-by: Thomas Gleixner Reviewed-by: Frederic Weisbecker Link: https://lore.kernel.org/r/20240221090548.36600-12-anna-maria@linutron= ix.de --- kernel/time/timer.c | 35 +++++++++++++++++++++++++++++++---- 1 file changed, 31 insertions(+), 4 deletions(-) diff --git a/kernel/time/timer.c b/kernel/time/timer.c index aabd136..38becd2 100644 --- a/kernel/time/timer.c +++ b/kernel/time/timer.c @@ -266,6 +266,11 @@ struct timer_base { =20 static DEFINE_PER_CPU(struct timer_base, timer_bases[NR_BASES]); =20 +struct timer_events { + u64 local; + u64 global; +}; + #ifdef CONFIG_NO_HZ_COMMON =20 static DEFINE_STATIC_KEY_FALSE(timers_nohz_active); @@ -2031,10 +2036,11 @@ static unsigned long next_timer_interrupt(struct ti= mer_base *base, static inline u64 __get_next_timer_interrupt(unsigned long basej, u64 base= m, bool *idle) { + struct timer_events tevt =3D { .local =3D KTIME_MAX, .global =3D KTIME_MA= X }; unsigned long nextevt, nextevt_local, nextevt_global; struct timer_base *base_local, *base_global; - u64 expires =3D KTIME_MAX; bool local_first; + u64 expires; =20 /* * Pretend that there is no timer pending if the cpu is offline. @@ -2043,7 +2049,7 @@ static inline u64 __get_next_timer_interrupt(unsigned= long basej, u64 basem, if (cpu_is_offline(smp_processor_id())) { if (idle) *idle =3D true; - return expires; + return tevt.local; } =20 base_local =3D this_cpu_ptr(&timer_bases[BASE_LOCAL]); @@ -2059,14 +2065,33 @@ static inline u64 __get_next_timer_interrupt(unsign= ed long basej, u64 basem, =20 nextevt =3D local_first ? nextevt_local : nextevt_global; =20 - if (base_local->timers_pending || base_global->timers_pending) { + /* + * If the @nextevt is at max. one tick away, use @nextevt and store + * it in the local expiry value. The next global event is irrelevant in + * this case and can be left as KTIME_MAX. + */ + if (time_before_eq(nextevt, basej + 1)) { /* If we missed a tick already, force 0 delta */ if (time_before(nextevt, basej)) nextevt =3D basej; - expires =3D basem + (u64)(nextevt - basej) * TICK_NSEC; + tevt.local =3D basem + (u64)(nextevt - basej) * TICK_NSEC; + goto forward; } =20 /* + * Update tevt.* values: + * + * If the local queue expires first, then the global event can be + * ignored. If the global queue is empty, nothing to do either. + */ + if (!local_first && base_global->timers_pending) + tevt.global =3D basem + (u64)(nextevt_global - basej) * TICK_NSEC; + + if (base_local->timers_pending) + tevt.local =3D basem + (u64)(nextevt_local - basej) * TICK_NSEC; + +forward: + /* * We have a fresh next event. Check whether we can forward the * base. */ @@ -2096,6 +2121,8 @@ static inline u64 __get_next_timer_interrupt(unsigned= long basej, u64 basem, raw_spin_unlock(&base_global->lock); raw_spin_unlock(&base_local->lock); =20 + expires =3D min_t(u64, tevt.local, tevt.global); + return cmp_next_hrtimer_event(basem, expires); }