From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754696AbbDHTUq (ORCPT ); Wed, 8 Apr 2015 15:20:46 -0400 Received: from mail-am1on0054.outbound.protection.outlook.com ([157.56.112.54]:10240 "EHLO emea01-am1-obe.outbound.protection.outlook.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753400AbbDHTUo (ORCPT ); Wed, 8 Apr 2015 15:20:44 -0400 Authentication-Results: spf=fail (sender IP is 12.216.194.146) smtp.mailfrom=ezchip.com; ezchip.com; dkim=none (message not signed) header.d=none; From: To: "Peter Zijlstra (Intel)" , Frederic Weisbecker , "Paul E. McKenney" , "Rafael J. Wysocki" , Martin Schwidefsky , Ingo Molnar , CC: Chris Metcalf Subject: [PATCH v3 1/2] nohz: add tick_nohz_full_clear_cpus() and _set_cpus() APIs Date: Wed, 8 Apr 2015 15:20:24 -0400 Message-ID: <1428520825-4780-1-git-send-email-cmetcalf@ezchip.com> X-Mailer: git-send-email 2.1.2 In-Reply-To: <20150408172424.GC13227@lerouge> References: <20150408172424.GC13227@lerouge> X-EOPAttributedMessage: 0 X-Forefront-Antispam-Report: CIP:12.216.194.146;CTRY:US;IPV:NLI;EFV:NLI;BMV:1;SFV:NSPM;SFS:(10009020)(6009001)(339900001)(199003)(189002)(76176999)(50226001)(62966003)(77156002)(19580405001)(36756003)(85426001)(47776003)(86362001)(6806004)(48376002)(229853001)(33646002)(46102003)(86152002)(2950100001)(106466001)(50466002)(105606002)(42186005)(87936001)(92566002)(19580395003)(50986999)(104016003);DIR:OUT;SFP:1101;SCL:1;SRVR:VI1PR02MB0781;H:ld-1.internal.tilera.com;FPR:;SPF:Fail;MLV:sfv;A:1;MX:1;LANG:en; MIME-Version: 1.0 Content-Type: text/plain X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:VI1PR02MB0781; X-Microsoft-Antispam-PRVS: X-Exchange-Antispam-Report-Test: UriScan:; X-Exchange-Antispam-Report-CFA-Test: BCL:0;PCL:0;RULEID:(601004)(5002010)(5005006);SRVR:VI1PR02MB0781;BCL:0;PCL:0;RULEID:;SRVR:VI1PR02MB0781; X-Forefront-PRVS: 0540846A1D X-OriginatorOrg: ezchip.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 08 Apr 2015 19:20:41.1297 (UTC) X-MS-Exchange-CrossTenant-Id: 0fc16e0a-3cd3-4092-8b2f-0a42cff122c3 X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=0fc16e0a-3cd3-4092-8b2f-0a42cff122c3;Ip=[12.216.194.146];Helo=[ld-1.internal.tilera.com] X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: VI1PR02MB0781 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Chris Metcalf The "clear" API is useful, for example, to modify a cpumask to avoid the nohz cores so that interrupts aren't sent to them. Likewise the "set" API is useful to modify a cpumask indicating some special nohz-type functionality so that the nohz cores are automatically added to that set. Signed-off-by: Chris Metcalf --- v3: no change here, just in part 2/2. v2: put the "...set_cpus" API together with the change to init_sched_domains() so that they can go into the timer tree independently of other changes in my tree. include/linux/tick.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/include/linux/tick.h b/include/linux/tick.h index 9c085dc12ae9..29456c443970 100644 --- a/include/linux/tick.h +++ b/include/linux/tick.h @@ -186,6 +186,18 @@ static inline bool tick_nohz_full_cpu(int cpu) return cpumask_test_cpu(cpu, tick_nohz_full_mask); } +static inline void tick_nohz_full_clear_cpus(struct cpumask *mask) +{ + if (tick_nohz_full_enabled()) + cpumask_andnot(mask, mask, tick_nohz_full_mask); +} + +static inline void tick_nohz_full_set_cpus(struct cpumask *mask) +{ + if (tick_nohz_full_enabled()) + cpumask_or(mask, mask, tick_nohz_full_mask); +} + extern void __tick_nohz_full_check(void); extern void tick_nohz_full_kick(void); extern void tick_nohz_full_kick_cpu(int cpu); @@ -194,6 +206,8 @@ extern void __tick_nohz_task_switch(struct task_struct *tsk); #else static inline bool tick_nohz_full_enabled(void) { return false; } static inline bool tick_nohz_full_cpu(int cpu) { return false; } +static inline void tick_nohz_full_clear_cpus(struct cpumask *mask) { } +static inline void tick_nohz_full_set_cpus(struct cpumask *mask) { } static inline void __tick_nohz_full_check(void) { } static inline void tick_nohz_full_kick_cpu(int cpu) { } static inline void tick_nohz_full_kick(void) { } -- 2.1.2