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=-5.1 required=3.0 tests=DKIM_INVALID,DKIM_SIGNED, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,USER_AGENT_SANE_1 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 0D243C19759 for ; Thu, 1 Aug 2019 14:51:27 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id D47E320449 for ; Thu, 1 Aug 2019 14:51:26 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="tfVE0gpM" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732299AbfHAOvZ (ORCPT ); Thu, 1 Aug 2019 10:51:25 -0400 Received: from bombadil.infradead.org ([198.137.202.133]:47980 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731148AbfHAOvZ (ORCPT ); Thu, 1 Aug 2019 10:51:25 -0400 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20170209; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Id: List-Help:List-Unsubscribe:List-Subscribe:List-Post:List-Owner:List-Archive; bh=TLXphQCYQA4IH6EeQfPIRer8TKaUSBx10Q5NGx+zH2A=; b=tfVE0gpM/bbhJ21q88MryQl3W VpX8K2qjMXf2ZLhMSkeoQbqrPsU9ZrsrQNacazFNkqJZrfdGGRJwVGcQ94yYxloZP6LKLYCt1OIbf WRxKna+/IOOgsWkKvhc0+05JYEILE71YYB88OGPSWnGt++lKvCqOmBfL75cMoU8YdqaMy9Qe5yma9 cborZwPpvfMaWKk2ePpV7LlvV7Pq5iKQQKH0zcT6OgICS1/pMWpMVMH+JwG1Diy7674fLSHYEfd7v i0D6QkPd7sTNG12iftcHxo0XauzkcWoEGK4Xi835kdhlGES7tnNESUNUfVTpZV9kqeVXGjIDLM17p cylcGOXww==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=hirez.programming.kicks-ass.net) by bombadil.infradead.org with esmtpsa (Exim 4.92 #3 (Red Hat Linux)) id 1htCQH-0005Qw-M0; Thu, 01 Aug 2019 14:51:17 +0000 Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 17F132029F4C9; Thu, 1 Aug 2019 16:51:16 +0200 (CEST) Date: Thu, 1 Aug 2019 16:51:16 +0200 From: Peter Zijlstra To: Thomas Gleixner Cc: LKML , x86@kernel.org, Ingo Molnar , Sebastian Siewior , Anna-Maria Gleixner , Steven Rostedt , Julia Cartwright , Paul McKenney , Frederic Weisbecker , John Stultz , Andy Lutomirski , "Paul E. McKenney" , Oleg Nesterov , kvm@vger.kernel.org, Radim Krcmar , Paolo Bonzini Subject: Re: [patch 4/5] posix-cpu-timers: Defer timer handling to task_work Message-ID: <20190801145116.GD31398@hirez.programming.kicks-ass.net> References: <20190801143250.370326052@linutronix.de> <20190801143658.074833024@linutronix.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190801143658.074833024@linutronix.de> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Aug 01, 2019 at 04:32:54PM +0200, Thomas Gleixner wrote: > --- a/kernel/time/Kconfig > +++ b/kernel/time/Kconfig > @@ -52,6 +52,11 @@ config GENERIC_CLOCKEVENTS_MIN_ADJUST > config GENERIC_CMOS_UPDATE > bool > > +# Select to handle posix CPU timers from task_work > +# and not from the timer interrupt context > +config POSIX_CPU_TIMERS_TASK_WORK > + bool > + > if GENERIC_CLOCKEVENTS > menu "Timers subsystem" > diff --git a/kernel/Kconfig.preempt b/kernel/Kconfig.preempt index deff97217496..76e37ad5bc31 100644 --- a/kernel/Kconfig.preempt +++ b/kernel/Kconfig.preempt @@ -58,6 +58,7 @@ config PREEMPT config PREEMPT_RT bool "Fully Preemptible Kernel (Real-Time)" depends on EXPERT && ARCH_SUPPORTS_RT + depends on POSIX_CPU_TIMERS_TASK_WORK select PREEMPTION help This option turns the kernel into a real-time kernel by replacing