Re: Status of tip/x86/apic

From: Steven Rostedt
Date: Fri Dec 12 2014 - 18:14:39 EST

On Fri, 12 Dec 2014 21:35:14 +0100 (CET)
Thomas Gleixner <tglx@xxxxxxxxxxxxx> wrote:

> We're almost there with x86 but my gut feeling tells me that pushing
> it now is too risky. I rather prefer quiet holidays for all of us than
> the nagging fear that the post holiday inbox will be full of obscure
> bug reports and we then start a chase and bandaid race which will kill
> the well earned recreation in an instant.

> Though one issue with that is, that for the early boot process
> there is no way to store that information as the tracer gets
> enabled way after init_IRQ(). But there is no reason why the
> tracer could not be enabled before that. All it needs is a
> working memory allocator. Steven?
> Now there is another class of problems which might be hard to
> debug. When the machine just boots into a hang, so we dont get a
> ftrace output neither from an oops nor from a console. It would
> be nice if we could have a command line option which prints
> enabled trace points via (early_)printk. That would avoid
> sending out ad hoc printk debug patches which will basically
> provide the same information as the trace_points. That would be
> useful for other hard to debug boot hangs as well. Steven?

Sure sure, everyone gets a nice calm xmas except for poor Steven who
has to hack on early tracepoints such that this will be ready for 3.20!

-- Steve (The Grinch who Hacked on Christmas)
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