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Fri, 30 Aug 2024 22:29:16 +0000 Received: from CO6PR10MB5409.namprd10.prod.outlook.com ([fe80::25a9:32c2:a7b0:de9e]) by CO6PR10MB5409.namprd10.prod.outlook.com ([fe80::25a9:32c2:a7b0:de9e%3]) with mapi id 15.20.7918.020; Fri, 30 Aug 2024 22:29:16 +0000 From: Ankur Arora To: linux-pm@vger.kernel.org, kvm@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Cc: catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, dave.hansen@linux.intel.com, x86@kernel.org, hpa@zytor.com, pbonzini@redhat.com, wanpengli@tencent.com, vkuznets@redhat.com, rafael@kernel.org, daniel.lezcano@linaro.org, peterz@infradead.org, arnd@arndb.de, lenb@kernel.org, mark.rutland@arm.com, harisokn@amazon.com, mtosatti@redhat.com, sudeep.holla@arm.com, cl@gentwo.org, misono.tomohiro@fujitsu.com, maobibo@loongson.cn, joao.m.martins@oracle.com, boris.ostrovsky@oracle.com, konrad.wilk@oracle.com Subject: [PATCH v7 10/10] cpuidle/poll_state: limit POLL_IDLE_RELAX_COUNT on arm64 Date: Fri, 30 Aug 2024 15:28:44 -0700 Message-Id: <20240830222844.1601170-11-ankur.a.arora@oracle.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20240830222844.1601170-1-ankur.a.arora@oracle.com> References: <20240830222844.1601170-1-ankur.a.arora@oracle.com> X-ClientProxiedBy: MW4PR03CA0011.namprd03.prod.outlook.com (2603:10b6:303:8f::16) To CO6PR10MB5409.namprd10.prod.outlook.com (2603:10b6:5:357::14) Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: CO6PR10MB5409:EE_|IA0PR10MB6771:EE_ X-MS-Office365-Filtering-Correlation-Id: c9ec3a50-945d-4d9f-0302-08dcc9432e93 X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0;ARA:13230040|1800799024|376014|7416014|366016; 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To limit the frequency of the relatively expensive time check it is limited to once every POLL_IDLE_RELAX_COUNT iterations. arm64, however uses an event based mechanism, where instead of polling, we wait for store to a region. Limit the POLL_IDLE_RELAX_COUNT to 1 for that case. Suggested-by: Haris Okanovic Signed-off-by: Ankur Arora --- drivers/cpuidle/poll_state.c | 11 +++++++++++ 1 file changed, 11 insertions(+) diff --git a/drivers/cpuidle/poll_state.c b/drivers/cpuidle/poll_state.c index fc1204426158..61df2395585e 100644 --- a/drivers/cpuidle/poll_state.c +++ b/drivers/cpuidle/poll_state.c @@ -8,7 +8,18 @@ #include #include +#ifdef CONFIG_ARM64 +/* + * POLL_IDLE_RELAX_COUNT determines how often we check for timeout + * while polling for TIF_NEED_RESCHED in thread_info->flags. + * + * Set this to a low value since arm64, instead of polling, uses a + * event based mechanism. + */ +#define POLL_IDLE_RELAX_COUNT 1 +#else #define POLL_IDLE_RELAX_COUNT 200 +#endif static int __cpuidle poll_idle(struct cpuidle_device *dev, struct cpuidle_driver *drv, int index)