Date: Mon, 19 Dec 2016 16:38:05 -0800 From: Adrian Chadd <adrian.chadd@gmail.com> To: Jordan Hubbard <jkh@mail.turbofuzz.com> Cc: "freebsd-arch@freebsd.org" <freebsd-arch@freebsd.org>, freebsd-current <freebsd-current@freebsd.org> Subject: Re: RFC: DTrace probes for debugging or testing in userland programs Message-ID: <CAJ-Vmoncp%2BqT97ipfn02S%2BAx%2BNkze8kX3E2=9Hf7dykZzz2X0w@mail.gmail.com> In-Reply-To: <C2625566-4A75-42B3-B60F-3FF079AAAD8B@mail.turbofuzz.com> References: <20161220.043646.1181938468712455328.hrs@allbsd.org> <CAJ-Vmon3%2BjMyfgBcVORyMoXX3JEAFCWtK2VPo9wWLN2hsS%2BrNA@mail.gmail.com> <C2625566-4A75-42B3-B60F-3FF079AAAD8B@mail.turbofuzz.com>
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On 19 December 2016 at 16:04, Jordan Hubbard <jkh@mail.turbofuzz.com> wrote: > > On Dec 19, 2016, at 12:27 PM, Adrian Chadd <adrian.chadd@gmail.com> wrote: > > So although I like the sentiment, I don't think using dtrace for > program logging is the right answer. I like what apple did to wrap > the program logging stuff so people didn't just write their own > libraries (hi!) and so there's a unified-ish way to interact with > apple programs. I think we could do with that. > > > Thanks! > > We did a number of other things with ASL (Apple System Logger) which I miss > very much today and would hope to see in any FreeBSD equivalent: > > 1. We structured all log data into dictionaries, so every application and/or > subsystem within that application can add its own “tags” without squashing > other key information. This also unified the character encoding format, so > some applications were no longer logging in ISO-Latin1, others in UTF-8 and > yet others in SHIFT-JIS. > > 2. There’s also a logging database, as one of the many possible “output > sinks”, so searches / queries are fast (and there’s an API for querying and > managing its contents). > > 3. We added client-side and server side logging filters, so you can “crank > an application up” or shut its mouth without having to make any code > changes. > > 4. It’s all thread-safe. Hm. Where's the ASL source hiding? I'm kinda hoping it's light weight enough to port over without porting a lot of other stuff, but I am also afraid it's Apple.. :) -adrianhelp
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