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=-11.9 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 9E371C433FF for ; Thu, 1 Aug 2019 15:52:26 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 6EABB206B8 for ; Thu, 1 Aug 2019 15:52:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=zytor.com header.i=@zytor.com header.b="T+//7okF" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731562AbfHAPwY (ORCPT ); Thu, 1 Aug 2019 11:52:24 -0400 Received: from terminus.zytor.com ([198.137.202.136]:39083 "EHLO terminus.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728404AbfHAPwY (ORCPT ); Thu, 1 Aug 2019 11:52:24 -0400 Received: from terminus.zytor.com (localhost [127.0.0.1]) by terminus.zytor.com (8.15.2/8.15.2) with ESMTPS id x71FqFqu005035 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Thu, 1 Aug 2019 08:52:15 -0700 DKIM-Filter: OpenDKIM Filter v2.11.0 terminus.zytor.com x71FqFqu005035 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=zytor.com; s=2019071901; t=1564674735; bh=V81xyc1CKtZZ0EXikPqyhZhJimH7JUJHZlBrjH8C1qE=; h=Date:From:Cc:Reply-To:In-Reply-To:References:To:Subject:From; b=T+//7okFVJ6B/CZSScoFc+A9vYpe8ZeTl+zZPOpPH/5rc7+L5SqKKj6Qp6HO9JvK6 iz6thKXN2z1pJMuVgo0uCF3v92mcbBerB0TTraL9LboMjayoYimknrGU/99U8iuCPz KXo36mw5IWHOWY/bOSR/o9bJlfmbDazKYcPVZ0F2onDv9b2htAT0tw9wqGX/czmBVV jtI+8RuNzmkQzdPRAwGahnWXJYTW0m0yNcJSGev4dIOFAL1bdEqx3iqI5Lnp9LcJ5e EQieK03b6OvHNFLljPdPAvsID8jVqBPBOPknRleTD3Ia8eMEN29Y1q33UlgsOvw0bj LoFs5YMtEbR2A== Received: (from tipbot@localhost) by terminus.zytor.com (8.15.2/8.15.2/Submit) id x71FqExN005032; Thu, 1 Aug 2019 08:52:14 -0700 Date: Thu, 1 Aug 2019 08:52:14 -0700 X-Authentication-Warning: terminus.zytor.com: tipbot set sender to tipbot@zytor.com using -f From: tip-bot for Sebastian Andrzej Siewior Message-ID: Cc: linux-kernel@vger.kernel.org, peterz@infradead.org, bigeasy@linutronix.de, tglx@linutronix.de, mingo@kernel.org, hpa@zytor.com Reply-To: tglx@linutronix.de, mingo@kernel.org, peterz@infradead.org, bigeasy@linutronix.de, hpa@zytor.com, linux-kernel@vger.kernel.org In-Reply-To: <20190726185752.981398465@linutronix.de> References: <20190726185752.981398465@linutronix.de> To: linux-tip-commits@vger.kernel.org Subject: [tip:timers/core] hrtimer: Introduce HARD expiry mode Git-Commit-ID: ae6683d815895c2be1e60e1942630fa99488055b X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset=UTF-8 Content-Disposition: inline Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Commit-ID: ae6683d815895c2be1e60e1942630fa99488055b Gitweb: https://git.kernel.org/tip/ae6683d815895c2be1e60e1942630fa99488055b Author: Sebastian Andrzej Siewior AuthorDate: Fri, 26 Jul 2019 20:30:51 +0200 Committer: Thomas Gleixner CommitDate: Thu, 1 Aug 2019 17:43:16 +0200 hrtimer: Introduce HARD expiry mode On PREEMPT_RT not all hrtimers can be expired in hard interrupt context even if that is perfectly fine on a PREEMPT_RT=n kernel, e.g. because they take regular spinlocks. Also for latency reasons PREEMPT_RT tries to defer most hrtimers' expiry into soft interrupt context. But there are hrtimers which must be expired in hard interrupt context even when PREEMPT_RT is enabled: - hrtimers which must expiry in hard interrupt context, e.g. scheduler, perf, watchdog related hrtimers - latency critical hrtimers, e.g. nanosleep, ..., kvm lapic timer Add a new mode flag HRTIMER_MODE_HARD which allows to mark these timers so PREEMPT_RT will not move them into softirq expiry mode. [ tglx: Split out of a larger combo patch. Added changelog ] Signed-off-by: Sebastian Andrzej Siewior Signed-off-by: Thomas Gleixner Acked-by: Peter Zijlstra (Intel) Link: https://lkml.kernel.org/r/20190726185752.981398465@linutronix.de --- include/linux/hrtimer.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/include/linux/hrtimer.h b/include/linux/hrtimer.h index 24072a0942c0..15c2ba6b6316 100644 --- a/include/linux/hrtimer.h +++ b/include/linux/hrtimer.h @@ -38,6 +38,7 @@ enum hrtimer_mode { HRTIMER_MODE_REL = 0x01, HRTIMER_MODE_PINNED = 0x02, HRTIMER_MODE_SOFT = 0x04, + HRTIMER_MODE_HARD = 0x08, HRTIMER_MODE_ABS_PINNED = HRTIMER_MODE_ABS | HRTIMER_MODE_PINNED, HRTIMER_MODE_REL_PINNED = HRTIMER_MODE_REL | HRTIMER_MODE_PINNED, @@ -48,6 +49,11 @@ enum hrtimer_mode { HRTIMER_MODE_ABS_PINNED_SOFT = HRTIMER_MODE_ABS_PINNED | HRTIMER_MODE_SOFT, HRTIMER_MODE_REL_PINNED_SOFT = HRTIMER_MODE_REL_PINNED | HRTIMER_MODE_SOFT, + HRTIMER_MODE_ABS_HARD = HRTIMER_MODE_ABS | HRTIMER_MODE_HARD, + HRTIMER_MODE_REL_HARD = HRTIMER_MODE_REL | HRTIMER_MODE_HARD, + + HRTIMER_MODE_ABS_PINNED_HARD = HRTIMER_MODE_ABS_PINNED | HRTIMER_MODE_HARD, + HRTIMER_MODE_REL_PINNED_HARD = HRTIMER_MODE_REL_PINNED | HRTIMER_MODE_HARD, }; /*