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Received-SPF: Pass (protection.outlook.com: domain of amd.com designates 165.204.84.17 as permitted sender) receiver=protection.outlook.com; client-ip=165.204.84.17; helo=SATLEXMB04.amd.com; pr=C Received: from SATLEXMB04.amd.com (165.204.84.17) by SA2PEPF000015CB.mail.protection.outlook.com (10.167.241.201) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.20.7292.25 via Frontend Transport; Tue, 20 Feb 2024 17:18:33 +0000 Received: from BLR5CG134614W.amd.com (10.180.168.240) by SATLEXMB04.amd.com (10.181.40.145) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2507.35; Tue, 20 Feb 2024 11:18:27 -0600 From: K Prateek Nayak To: CC: "Gautham R. 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Wysocki" , Daniel Lezcano , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , "Mel Gorman" , Daniel Bristot de Oliveira , Valentin Schneider , Al Viro , , Subject: [RFC PATCH 06/14] alpha/thread_info: Introduce TIF_NOTIFY_IPI flag Date: Tue, 20 Feb 2024 22:44:49 +0530 Message-ID: <20240220171457.703-7-kprateek.nayak@amd.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240220171457.703-1-kprateek.nayak@amd.com> References: <20240220171457.703-1-kprateek.nayak@amd.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-ClientProxiedBy: SATLEXMB04.amd.com (10.181.40.145) To SATLEXMB04.amd.com (10.181.40.145) X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PEPF000015CB:EE_|DM4PR12MB6038:EE_ X-MS-Office365-Filtering-Correlation-Id: 9b1b40be-f2ee-4042-10fa-08dc3237f73b X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:165.204.84.17;CTRY:US;LANG:en;SCL:1;SRV:;IPV:CAL;SFV:NSPM;H:SATLEXMB04.amd.com;PTR:InfoDomainNonexistent;CAT:NONE;SFS:(13230031)(36860700004)(46966006)(40470700004);DIR:OUT;SFP:1101; X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 20 Feb 2024 17:18:33.1576 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 9b1b40be-f2ee-4042-10fa-08dc3237f73b X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: SA2PEPF000015CB.namprd03.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: DM4PR12MB6038 Add support for TIF_NOTIFY_IPI on Alpha. With TIF_NOTIFY_IPI, a sender sending an IPI to an idle CPU in TIF_POLLING mode will set the TIF_NOTIFY_IPI flag in the target's idle tasks's thread_info to pull the CPU out of idle, as opposed to setting TIF_NEED_RESCHED previously. This avoids spurious calls to schedule_idle() in cases where an IPI does not necessarily wake up a task on the idle CPU. Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Matt Turner Cc: "Rafael J. Wysocki" Cc: Daniel Lezcano Cc: Ingo Molnar Cc: Peter Zijlstra Cc: Juri Lelli Cc: Vincent Guittot Cc: Dietmar Eggemann Cc: Steven Rostedt Cc: Ben Segall Cc: Mel Gorman Cc: Daniel Bristot de Oliveira Cc: Valentin Schneider Cc: Al Viro Cc: linux-alpha@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: linux-pm@vger.kernel.org Signed-off-by: K Prateek Nayak --- arch/alpha/include/asm/thread_info.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/arch/alpha/include/asm/thread_info.h b/arch/alpha/include/asm/thread_info.h index 4a4d00b37986..8c17855c85c7 100644 --- a/arch/alpha/include/asm/thread_info.h +++ b/arch/alpha/include/asm/thread_info.h @@ -64,6 +64,7 @@ register unsigned long *current_stack_pointer __asm__ ("$30"); #define TIF_NEED_RESCHED 3 /* rescheduling necessary */ #define TIF_SYSCALL_AUDIT 4 /* syscall audit active */ #define TIF_NOTIFY_SIGNAL 5 /* signal notifications exist */ +#define TIF_NOTIFY_IPI 6 /* Pending IPI on TIF_POLLLING idle CPU */ #define TIF_DIE_IF_KERNEL 9 /* dik recursion lock */ #define TIF_MEMDIE 13 /* is terminating due to OOM killer */ #define TIF_POLLING_NRFLAG 14 /* idle is polling for TIF_NEED_RESCHED */ @@ -74,6 +75,7 @@ register unsigned long *current_stack_pointer __asm__ ("$30"); #define _TIF_NOTIFY_RESUME (1<