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 mi= ss > 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 =E2=80=9Ctags=E2=80=9D = 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 a= nd > yet others in SHIFT-JIS. > > 2. There=E2=80=99s also a logging database, as one of the many possible = =E2=80=9Coutput > sinks=E2=80=9D, so searches / queries are fast (and there=E2=80=99s an AP= I for querying and > managing its contents). > > 3. We added client-side and server side logging filters, so you can =E2= =80=9Ccrank > an application up=E2=80=9D or shut its mouth without having to make any c= ode > changes. > > 4. It=E2=80=99s 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.. :) -adrian
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