From owner-freebsd-hackers@freebsd.org Tue Dec 13 05:49:25 2016 Return-Path: Delivered-To: freebsd-hackers@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 7F1FBC75E25 for ; Tue, 13 Dec 2016 05:49:25 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: from mail-io0-x22d.google.com (mail-io0-x22d.google.com [IPv6:2607:f8b0:4001:c06::22d]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 45F381FA0 for ; Tue, 13 Dec 2016 05:49:25 +0000 (UTC) (envelope-from adrian.chadd@gmail.com) Received: by mail-io0-x22d.google.com with SMTP id d9so207590667ioe.0 for ; Mon, 12 Dec 2016 21:49:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:in-reply-to:references:from:date:message-id:subject:to :cc; bh=lB8WL7iF65M9oDdt9lkxcNUOhaNeSMh7qH+T/479bOc=; b=Co9SKTmfZ2ZnP65/C3Gx6SSoo2pcgtKWVC5AY9ZrbZYLOhRHwVy1B+XkR0HAraaE10 gpBkOLbIVsOuuPC/ce6AYIpoA40Or2KBGbD3pSzwPA05slAKM+jGXYbS4d5E45lmRplt 3H3vhRGDFxbUVeQDHQ5keZ6yl3x3hQks2pnnixLYFYjJxGN6v4aLgOc6ttXulY/n06b5 zG+yaRbltABOmwZpeYXhU9EzpAqJlBa4uLYtELSUeNGPFFGthVCtcA6MLbUxBFYt1cs/ kEGuRZsFGFpH2EGzm5sgHW2l2FvQUOL/dFPLEFTvjQu2XegL33sHOWzA2DrJF0Beo90l +Gmw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:in-reply-to:references:from:date :message-id:subject:to:cc; bh=lB8WL7iF65M9oDdt9lkxcNUOhaNeSMh7qH+T/479bOc=; b=L3NDttuKSsBbjqI+u9DBXCcJXx48hLm9M6QrcQMS+kbYnJhzq72ZhqF4fotQ0fFWgy odh/TWLcww1hQTFgl09flzWnvuoi/NcdUbHDWxd4CT94kB/aFxbxOM236wcO9JpnM3iI 32MRscg3I0HtYDrviI31SXbTUab6UHbPjZ1J9qDmVpl8UrAoDRA1C1EulA6QfKXbn0ol mylENcneF/o85oRAbKFosT7iWgqS5RJafWQKCJkFy9JNcaHUxglcBc7cu03LzlZ+/5gH y1nP5X3hEDnyYGEHNE4NenKIZLIGOnnC6HksBwUDwVp+Dknk9547twrLU9LRya2/BGW7 1MRA== X-Gm-Message-State: AKaTC03SHcJ6qoXNhbe4Hz3VqrfQESzyCDrlB58ZLKOaDxN0gGhZDdnU6W9aeiDEQgxwjuf2SsuBZREM6DuVYQ== X-Received: by 10.36.58.85 with SMTP id m82mr1079817itm.29.1481608164605; Mon, 12 Dec 2016 21:49:24 -0800 (PST) MIME-Version: 1.0 Received: by 10.36.150.129 with HTTP; Mon, 12 Dec 2016 21:49:23 -0800 (PST) In-Reply-To: References: <200A5D70-24CE-4843-B99D-E10A2AF4F68F@FreeBSD.org> <20161213052759.GP61036@server.rulingia.com> From: Adrian Chadd Date: Mon, 12 Dec 2016 21:49:23 -0800 Message-ID: Subject: Re: Sysctl as a Service, or: making sysctl(3) more friendly for monitoring systems To: Warner Losh Cc: Peter Jeremy , FreeBSD Hackers , Ed Schouten Content-Type: text/plain; charset=UTF-8 X-Mailman-Approved-At: Tue, 13 Dec 2016 12:12:50 +0000 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 13 Dec 2016 05:49:25 -0000 If only we had a mechanism for these kinds of sensors to register, so the API they'd be using would be one that lead itself to edge/level triggered comparisons, versus polling. Wait, didn't we /have/ one of those up for review a few years ago, and it wasn't merged in? -adrian