From owner-freebsd-dtrace@FreeBSD.ORG Tue Oct 8 19:56:52 2013 Return-Path: <owner-freebsd-dtrace@FreeBSD.ORG> Delivered-To: dtrace@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) (using TLSv1 with cipher ADH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTP id 5B06887E for <dtrace@freebsd.org>; Tue, 8 Oct 2013 19:56:52 +0000 (UTC) (envelope-from pfg@FreeBSD.org) Received: from nm26.bullet.mail.ne1.yahoo.com (nm26.bullet.mail.ne1.yahoo.com [98.138.90.89]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.freebsd.org (Postfix) with ESMTPS id 09E272C80 for <dtrace@freebsd.org>; Tue, 8 Oct 2013 19:56:51 +0000 (UTC) Received: from [98.138.226.177] by nm26.bullet.mail.ne1.yahoo.com with NNFMP; 08 Oct 2013 19:56:50 -0000 Received: from [98.138.84.41] by tm12.bullet.mail.ne1.yahoo.com with NNFMP; 08 Oct 2013 19:56:50 -0000 Received: from [127.0.0.1] by smtp109.mail.ne1.yahoo.com with NNFMP; 08 Oct 2013 19:56:50 -0000 X-Yahoo-Newman-Id: 833973.87913.bm@smtp109.mail.ne1.yahoo.com X-Yahoo-Newman-Property: ymail-3 X-YMail-OSG: DFN1kAsVM1nOpV35j99CpGR5x9HLTi0VFe1IJn_spBzt1a6 4vLSTd4y1JrHLR2J_dw93xlQaAzMLhe7vx7yXXaZxdMUwRMoCT7ob_hFMhB6 GSd8lS9y7zE4IKRud1y.gWAh8Cf4_KgROhovz9s6ZO6zkJVMLeuPAM71K2WT VBC3LEzNkqNZyHeAYyQN_5f.siYZAEC7iVopWEZmh28Ti5c8_5KGGX8F1X4O Rj0Li7uUCQoYnEbXExb6wXRJWd7q5xlYFa4W80iblvWI9t1FnOsTenSphXfy lL2NP3m3Tnl7UTpC6ZEr_6WS_Nq9PilGmYa_AvK037S_Vdh.S433IT2DAB7v bqf0YGsxEVW_pCYzko2ajT6FsIeMK_XDTICGDh80U.maGe3dYKSfYMjpBjYh vOMB8wX1ZDCsiyjQVjT_YZ32OCtUvBJ213B3kBet2pz.jb3dcE_RtUz_MgVE 3BReBxCYVb7iytt7a4VHIsQSDwYrF0_7r2B.l4A5HILhfArPOqqjOQ1TWSdP ACvSdUn5cr1MPnq3YT2.GdlIdWR2I3SDFEJjzu3XrcxgjwqBY_UatpYs6Jzw KPWvNGf3InKKEYGr.skWXhqfP26tzBkHIsUNkNpbreTblFCRPX6tLS0nh1PB 3WewnnsfpO4QG9sSLNQyq.CuWltOLllCHeZUK43ppsaAbKTtA_BzxvaleurX C7arx7eJAdgJWEtehL7A4obmUR7gU_eNsCsLBt9aSHJeSXzZOP3PwTJGRIpW tA8Tq9TyQqs.C7Rjl66BcWw40mbBoyALZirRTOPLZUXVibq.Z10whR4KO1L. xPPDzo_m9uBqZA2Ot4f4guj.ilYhST6QQ41gRaSA528oYsy6kg8NXZSr1GsO hQohNPMK0ve7x.UUiI2Y7KlCspNUcBxtPYEL3gP7rFgpA6uYEhKYKrMW9xAz SAuFoy_AawPSaly_jZg54GiY4ORQ1EuNI1MZTMAbs7l32GhQNtqZrQydT8PT edUGKNqcls49RHrw4lUlCyZy57M.eqdx1 X-Yahoo-SMTP: xcjD0guswBAZaPPIbxpWwLcp9Unf X-Rocket-Received: from [192.168.0.102] (pfg@190.157.126.109 with ) by smtp109.mail.ne1.yahoo.com with SMTP; 08 Oct 2013 12:56:50 -0700 PDT Message-ID: <52546385.2050203@FreeBSD.org> Date: Tue, 08 Oct 2013 14:56:53 -0500 From: Pedro Giffuni <pfg@FreeBSD.org> Organization: FreeBSD User-Agent: Mozilla/5.0 (Windows NT 6.2; WOW64; rv:17.0) Gecko/20130801 Thunderbird/17.0.8 MIME-Version: 1.0 To: dtrace@FreeBSD.org Subject: Dtrace providers wanted list Content-Type: text/plain; charset=windows-1252; format=flowed Content-Transfer-Encoding: 8bit X-BeenThere: freebsd-dtrace@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: "A discussion list for developers working on DTrace in FreeBSD." <freebsd-dtrace.freebsd.org> List-Unsubscribe: <https://lists.freebsd.org/mailman/options/freebsd-dtrace>, <mailto:freebsd-dtrace-request@freebsd.org?subject=unsubscribe> List-Archive: <http://lists.freebsd.org/pipermail/freebsd-dtrace> List-Post: <mailto:freebsd-dtrace@freebsd.org> List-Help: <mailto:freebsd-dtrace-request@freebsd.org?subject=help> List-Subscribe: <https://lists.freebsd.org/mailman/listinfo/freebsd-dtrace>, <mailto:freebsd-dtrace-request@freebsd.org?subject=subscribe> X-List-Received-Date: Tue, 08 Oct 2013 19:56:52 -0000 Hello; Sometime ago I looked around the list of Oracle's DTrace providers. https://wikis.oracle.com/display/DTrace/Providers We absolutely want them and although extremely useful as it is, DTrace won't be complete until we have them all ;). For the time being we should probably focus on getting the really critical ones though. The first in the list that we don't have that I think is critical is mentioned in Brendan Gregg's FreeBSD specific blog post: http://dtrace.org/blogs/brendan/2013/09/25/the-use-method-freebsd-performance-checklist/ "Tracing paging is tricker until the vminfo provider is added; you could try tracing from swap_pager_putpages() and swap_pager_getpages(), but I didn’t see an easy way to walk back to a thread struct; another approach may be via vm_fault_hold(). Good luck. ..." Next in the list would be a scsi provider. I came out with this introductory post to the scsi list a while ago: http://docs.freebsd.org/cgi/mid.cgi?51870B8F.5040306 There is more documentation on the net for the specific iscsi provider. For example: http://dtrace.org/blogs/ahl/2007/07/04/iscsi-dtrace-provider-and-more-to-come/ http://www.solarisinternals.com/wiki/index.php/DTrace_Topics_iSCSI The third critical provider that IMHO we must have is the CPU Performance Counter (CPC) Provider: https://blogs.oracle.com/jonh/entry/finally_dtrace_meets_the_cpu This is closely related to pmc(3) but obviously our implementation is completely different from the Solaris one. Well, just though I should share the above links in the hope of motivating more DTrace provider porting. At this time our base Dtrace port is pretty good but we have the chicken and egg problem where developers don't know how useful DTrace really is because there is no provider for their code. Cheers, Pedro.