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From: Steven Rostedt <rostedt@goodmis.org>
To: Thomas Gleixner <tglx@linutronix.de>
Cc: LKML <linux-kernel@vger.kernel.org>,
	Jiang Liu <jiang.liu@linux.intel.com>,
	x86@kernel.org, Linus Torvalds <torvalds@linux-foundation.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Tony Luck <tony.luck@intel.com>, Borislav Petkov <bp@alien8.de>,
	Joerg Roedel <joro@8bytes.org>,
	Marc Zyngier <marc.zyngier@arm.com>,
	Yinghai Lu <yinghai@kernel.org>,
	Alex Williamson <alex.williamson@redhat.com>
Subject: Re: Status of tip/x86/apic
Date: Fri, 12 Dec 2014 18:14:20 -0500
Message-ID: <20141212181420.47100d5c@gandalf.local.home> (raw)
In-Reply-To: <alpine.DEB.2.11.1412121539300.16494@nanos>

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

  parent reply index

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2014-12-12 20:35 Thomas Gleixner
2014-12-12 21:45 ` Borislav Petkov
2014-12-12 23:02 ` Linus Torvalds
2014-12-12 23:14 ` Steven Rostedt [this message]
2014-12-13  5:48   ` [RFC PATCH 0/2] tracing: The Grinch who stole the stealing of Christmas Steven Rostedt
2014-12-13  5:49     ` [RFC PATCH 1/2] tracing: Move enabling tracepoints to just after mm_init() Steven Rostedt
2014-12-13  5:50     ` [RFC PATCH 2/2] tracing: Add tracepoint_printk cmdline Steven Rostedt
2014-12-13 10:59       ` Borislav Petkov
2014-12-13 13:18         ` Steven Rostedt
2014-12-13 13:33           ` Borislav Petkov
2014-12-14 10:57 ` Status of tip/x86/apic Jiang Liu
2014-12-15 15:52 ` Steven Rostedt
2015-01-02 17:29   ` Mathieu Desnoyers

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