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Tue, 25 May 2021 03:02:04 +0000 Received: from HQMAIL111.nvidia.com (172.20.187.18) by HQMAIL109.nvidia.com (172.20.187.15) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Mon, 24 May 2021 20:02:04 -0700 Received: from [172.17.173.69] (172.20.145.6) by mail.nvidia.com (172.20.187.18) with Microsoft SMTP Server (TLS) id 15.0.1497.2 via Frontend Transport; Tue, 25 May 2021 03:02:04 +0000 Subject: Re: Multi pthreaded RT application - mlock doubt From: Dipen Patel To: References: <896cf71c-f610-961a-9d30-8a82d433e0f6@nvidia.com> Message-ID: <54ddc471-9bef-8a91-b82d-3c11412098c5@nvidia.com> Date: Mon, 24 May 2021 20:08:46 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <896cf71c-f610-961a-9d30-8a82d433e0f6@nvidia.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 81a6be36-5bfe-48ab-9f1e-08d91f2979e5 X-MS-TrafficTypeDiagnostic: BL1PR12MB5364: X-Microsoft-Antispam-PRVS: X-MS-Oob-TLC-OOBClassifiers: OLM:8882; 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X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 25 May 2021 03:02:04.7688 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 81a6be36-5bfe-48ab-9f1e-08d91f2979e5 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[216.228.112.32];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: CO1NAM11FT043.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: BL1PR12MB5364 Precedence: bulk List-ID: X-Mailing-List: linux-rt-users@vger.kernel.org Gentle ping on my below doubt... Thanks, Best Regards, Dipen Patel On 3/31/21 7:06 PM, Dipen Patel wrote: > Hi, > > I was following https://rt.wiki.kernel.org/index.php/Threaded_RT-application_with_memory_locking_and_stack_handling_example with some below changes: > > 1. Added 8 threads > 2. Moved show_new_pagefault_count logic inside thread function once thread starts running as below: > > thread_fn { > > getrusage(RUSAGE_SELF, &usage); > > print and save usage.ruminflt; > > prove_thread_stack_use_is_safe > > getrusage(RUSAGE_SELF, &usage); > > print usage.ruminflt - last_saved_cnt; > } > > I observed there are still page faults (although not in big numbers as if there was no mlock), after touching stack in prove_thread_stack_use_is_safe call. I played around with MY_STACK_SIZE (from 1KB to 1MB) but still see minor page faults. > > I am running 4.9.201_rt134 kernel. Any idea what I will be missing? > > Best Regards, > Dipen Patel >