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Mon, 8 Feb 2021 23:12:15 +0000 Subject: Re: [PATCH v5 bpf-next 1/4] bpf: introduce task_vma bpf_iter To: Song Liu , , , CC: , , , References: <20210208225255.3089073-1-songliubraving@fb.com> <20210208225255.3089073-2-songliubraving@fb.com> From: Yonghong Song Message-ID: <5286e70d-404d-f968-9694-f090eb8fd064@fb.com> Date: Mon, 8 Feb 2021 15:12:12 -0800 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:78.0) Gecko/20100101 Thunderbird/78.7.0 In-Reply-To: <20210208225255.3089073-2-songliubraving@fb.com> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [2620:10d:c090:400::5:cb47] X-ClientProxiedBy: CO2PR06CA0064.namprd06.prod.outlook.com (2603:10b6:104:3::22) To BYAPR15MB4088.namprd15.prod.outlook.com (2603:10b6:a02:c3::18) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from [IPv6:2620:10d:c085:21e1::1698] (2620:10d:c090:400::5:cb47) by CO2PR06CA0064.namprd06.prod.outlook.com (2603:10b6:104:3::22) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3825.17 via Frontend Transport; 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It > can be used to print customized information similar to /proc//maps. > > Current /proc//maps and /proc//smaps provide information of > vma's of a process. However, these information are not flexible enough to > cover all use cases. For example, if a vma cover mixed 2MB pages and 4kB > pages (x86_64), there is no easy way to tell which address ranges are > backed by 2MB pages. task_vma solves the problem by enabling the user to > generate customize information based on the vma (and vma->vm_mm, > vma->vm_file, etc.). > > To access the vma safely in the BPF program, task_vma iterator holds > target mmap_lock while calling the BPF program. If the mmap_lock is > contended, task_vma unlocks mmap_lock between iterations to unblock the > writer(s). This lock contention avoidance mechanism is similar to the one > used in show_smaps_rollup(). > > Signed-off-by: Song Liu Acked-by: Yonghong Song