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[209.85.220.65]) by mx.google.com with SMTPS id o12sor16134466pfh.39.2019.05.28.03.33.04 for (Google Transport Security); Tue, 28 May 2019 03:33:04 -0700 (PDT) Received-SPF: pass (google.com: domain of minchan.kim@gmail.com designates 209.85.220.65 as permitted sender) client-ip=209.85.220.65; Authentication-Results: mx.google.com; dkim=pass header.i=@gmail.com header.s=20161025 header.b=fvqIxpSu; spf=pass (google.com: domain of minchan.kim@gmail.com designates 209.85.220.65 as permitted sender) smtp.mailfrom=minchan.kim@gmail.com; dmarc=fail (p=NONE sp=NONE dis=NONE) header.from=kernel.org DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to:user-agent; bh=krgMSnEVy69yoxUL6+FT3pw/Wcuo2yl9vll0sSUGOww=; b=fvqIxpSuquyR4BpSeT5rFWP7ErwjkwJUnGWEyfvDGxz5/uVzNBZyAiZUKtfnK9WSVm H92bdTd0JQq+meoxC/A7cAvM+LRpEpouDQA/Ac2uSJKJPNOzcy4CzGpjewrZGPEG8LHo QASLekxEG4UQqoj3JFCRy87xxphDAuDtN6Oti3uuco3K8+nygGPwAroVtyo+eM4hURtU 7CKlX+ZoGV4ttxIBpBpa2Bh1pNKOMsk2eIWVef+vUVuyz6yF4SY+KQkJXIyCcdZc0eFm hCLhXnKVp4N6ZqzWkdxWMrxBHfFRe0MCOaSf3xL6YVgnU31InTxQImkkGN5E4ypIlJXY YTGg== X-Google-Smtp-Source: APXvYqxc+D0LEa1va91F68TbeYEmhMPMKJQZ9LgkOR5KNw+jdrb9GAAsS0CDZJbmp0XQkrYEFbL5rA== X-Received: by 2002:a62:2c17:: with SMTP id s23mr112033131pfs.51.1559039583555; Tue, 28 May 2019 03:33:03 -0700 (PDT) Received: from google.com ([2401:fa00:d:0:98f1:8b3d:1f37:3e8]) by smtp.gmail.com with ESMTPSA id m7sm8226184pff.44.2019.05.28.03.32.59 (version=TLS1_3 cipher=AEAD-AES256-GCM-SHA384 bits=256/256); Tue, 28 May 2019 03:33:02 -0700 (PDT) Date: Tue, 28 May 2019 19:32:56 +0900 From: Minchan Kim To: Michal Hocko Cc: Daniel Colascione , Andrew Morton , LKML , linux-mm , Johannes Weiner , Tim Murray , Joel Fernandes , Suren Baghdasaryan , Shakeel Butt , Sonny Rao , Brian Geffon , Linux API Subject: Re: [RFC 7/7] mm: madvise support MADV_ANONYMOUS_FILTER and MADV_FILE_FILTER Message-ID: <20190528103256.GA9199@google.com> References: <20190521025533.GH10039@google.com> <20190521062628.GE32329@dhcp22.suse.cz> <20190527075811.GC6879@google.com> <20190527124411.GC1658@dhcp22.suse.cz> <20190528032632.GF6879@google.com> <20190528062947.GL1658@dhcp22.suse.cz> <20190528081351.GA159710@google.com> <20190528084927.GB159710@google.com> <20190528090821.GU1658@dhcp22.suse.cz> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190528090821.GU1658@dhcp22.suse.cz> User-Agent: Mutt/1.10.1 (2018-07-13) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Archived-At: List-Archive: List-Post: On Tue, May 28, 2019 at 11:08:21AM +0200, Michal Hocko wrote: > On Tue 28-05-19 17:49:27, Minchan Kim wrote: > > On Tue, May 28, 2019 at 01:31:13AM -0700, Daniel Colascione wrote: > > > On Tue, May 28, 2019 at 1:14 AM Minchan Kim wrote: > > > > if we went with the per vma fd approach then you would get this > > > > > feature automatically because map_files would refer to file backed > > > > > mappings while map_anon could refer only to anonymous mappings. > > > > > > > > The reason to add such filter option is to avoid the parsing overhead > > > > so map_anon wouldn't be helpful. > > > > > > Without chiming on whether the filter option is a good idea, I'd like > > > to suggest that providing an efficient binary interfaces for pulling > > > memory map information out of processes. Some single-system-call > > > method for retrieving a binary snapshot of a process's address space > > > complete with attributes (selectable, like statx?) for each VMA would > > > reduce complexity and increase performance in a variety of areas, > > > e.g., Android memory map debugging commands. > > > > I agree it's the best we can get *generally*. > > Michal, any opinion? > > I am not really sure this is directly related. I think the primary > question that we have to sort out first is whether we want to have > the remote madvise call process or vma fd based. This is an important > distinction wrt. usability. I have only seen pid vs. pidfd discussions > so far unfortunately. With current usecase, it's per-process API with distinguishable anon/file but thought it could be easily extended later for each address range operation as userspace getting smarter with more information.