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[209.85.220.41]) by mx.google.com with SMTPS id l1sor5171733vsn.11.2019.05.28.01.31.24 for (Google Transport Security); Tue, 28 May 2019 01:31:25 -0700 (PDT) Received-SPF: pass (google.com: domain of dancol@google.com designates 209.85.220.41 as permitted sender) client-ip=209.85.220.41; Authentication-Results: mx.google.com; dkim=pass header.i=@google.com header.s=20161025 header.b=oZXsDC13; spf=pass (google.com: domain of dancol@google.com designates 209.85.220.41 as permitted sender) smtp.mailfrom=dancol@google.com; dmarc=pass (p=REJECT sp=REJECT dis=NONE) header.from=google.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20161025; h=mime-version:references:in-reply-to:from:date:message-id:subject:to :cc; bh=nDpCbodGGyTl/G0ilhTF0HY0iZvF6dtHic3QCj90ipM=; b=oZXsDC139BFCteWhHBnBHACBOyQMeYRAOrZf/VJ9wS/tQrz+S5esMvP0w8pm449GB0 cmPfZW9ULRdT8n87/iMLMqbXXoNT2419ayfmemKqxIJh/KqXliDTTIoDy/JJkTCzYryx iIlEjh1oNEoJ4CStLL3ikYedgGLSj31O/YU1e5WlFayKAu5dl4Cfe9sAOMTSo6ok56dv SscPem+FZ6pZKojuqiPTl9gCzY8bvmH3jPqX75TAYNEMn8ednqktRfMImHunEbKtoRUv Lf1i1JxgNOSbcFvnNzWMo0/z3X2u7Op2IXl1Rdo2AYwyzRhLvuUtMZjXo6ABqCq7Hxjt u1EA== X-Google-Smtp-Source: APXvYqzE8QewMLUeXU4DZglD7H5qffJkLV6mdCsxLIk1a1dGSRHlmjrRoO/5otC9dc45/lQq+x8myk+C/2zbJELkiOo= X-Received: by 2002:a67:e1d3:: with SMTP id p19mr60303726vsl.183.1559032284339; Tue, 28 May 2019 01:31:24 -0700 (PDT) MIME-Version: 1.0 References: <20190520035254.57579-1-minchan@kernel.org> <20190520035254.57579-8-minchan@kernel.org> <20190520092801.GA6836@dhcp22.suse.cz> <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> In-Reply-To: <20190528081351.GA159710@google.com> From: Daniel Colascione Date: Tue, 28 May 2019 01:31:13 -0700 Message-ID: Subject: Re: [RFC 7/7] mm: madvise support MADV_ANONYMOUS_FILTER and MADV_FILE_FILTER To: Minchan Kim Cc: Michal Hocko , Andrew Morton , LKML , linux-mm , Johannes Weiner , Tim Murray , Joel Fernandes , Suren Baghdasaryan , Shakeel Butt , Sonny Rao , Brian Geffon , Linux API Content-Type: text/plain; charset="UTF-8" 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: 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.