From mboxrd@z Thu Jan 1 00:00:00 1970 From: Frank Rowand Subject: Re: [PATCH] of: introduce event tracepoints for dynamic device_node lifecyle Date: Thu, 20 Apr 2017 03:44:32 -0700 Message-ID: <58F89110.1020904@gmail.com> References: <1492475525-10827-1-git-send-email-tyreld@linux.vnet.ibm.com> <58F6AA35.2040902@gmail.com> <58F6C088.8020304@gmail.com> <20170418224953.685943a3@grimm.local.home> <641aa8ee-9b54-716a-77a1-076cafb95e3a@linux.vnet.ibm.com> <58F81EF4.5070304@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <58F81EF4.5070304-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Tyrel Datwyler , Steven Rostedt Cc: robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org, linuxppc-dev-uLR06cmDAlY/bJ5BZ2RsiQ@public.gmane.org, linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, nfont-23VcF4HTsmIX0ybBhKVfKdBPR1lH4CV8@public.gmane.org, mpe-Gsx/Oe8HsFggBc27wqDAHg@public.gmane.org, mingo-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org List-Id: devicetree@vger.kernel.org On 04/19/17 19:37, Frank Rowand wrote: > On 04/19/17 11:45, Tyrel Datwyler wrote: >> On 04/18/2017 07:49 PM, Steven Rostedt wrote: >>> On Tue, 18 Apr 2017 18:42:32 -0700 >>> Frank Rowand wrote: >>> >>>> And of course the other issue with using tracepoints is the extra space >>>> required to hold the tracepoint info. With the pr_debug() approach, the >>>> space usage can be easily removed for a production kernel via a config >>>> option. >>> >>> Now if you are saying you want to be able to enable debugging without >>> the tracing infrastructure I would agree. As the tracing infrastructure >>> is large. But I'm working on shrinking it more. >> >> The primary consumers of OF_DYNAMIC seem to be pseries and powernv where >> we are generally going to see the trace infrastructure enabled by >> default in production. > > Another primary consumer will be overlays for ARM expansion boards. Still > a work in progress. And dynamic configuration for the FPGA folks. > -Frank > >> >> -Tyrel >> >>> >>>> >>>> Tracepoints are wonderful technology, but not always the proper tool to >>>> use for debug info. >>> >>> But if you are going to have tracing enabled regardless, adding a few >>> more tracepoints isn't going to make the difference. >>> >>> -- Steve >>> >>>> >>>>> If Rob wants to convert printk() style data to trace data (and I can't >>>>> convince him otherwise) then I will have further comments on this specific >>>>> patch. >>>>> >> >> . >> > > . > -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html