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Re: [PATCH, RFC] xfs: event tracing support

To: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Subject: Re: [PATCH, RFC] xfs: event tracing support
From: Eric Sandeen <sandeen@xxxxxxxxxxx>
Date: Thu, 16 Jul 2009 17:22:39 -0500
Cc: Felix Blyakher <felixb@xxxxxxx>, linux-ia64@xxxxxxxxxxxxxxx, Steven Rostedt <rostedt@xxxxxxxxxxx>, xfs@xxxxxxxxxxx
In-reply-to: <20090622205904.GA1855@xxxxxxxxxxxxx>
References: <20090616214844.GA12310@xxxxxxxxxxxxx> <4E752C93-A674-4725-AF23-C227C0A1E659@xxxxxxx> <20090622205904.GA1855@xxxxxxxxxxxxx>
User-agent: Thunderbird 2.0.0.21 (X11/20090320)
Christoph Hellwig wrote:
> On Mon, Jun 22, 2009 at 01:01:35PM -0500, Felix Blyakher wrote:
>>> To use it make sure CONFIG_EVENT_TRACING is enabled and then enable  
>>> all
>>> xfs trace channels by:
>>>
>>>   echo 1 > /sys/kernel/debug/tracing/events/xfs/enable
>> Does event tracing work on ia64 platform?
>> I spent some time on it over weekend, but was not able even
>> to force "CONFIG_EVENT_TRACING=y" setting in the .config.
>> Seems to build ok on x86_64, which does have CONFIG_TRACING
>> in defconfig, and allows to set CONFIG_EVENT_TRACING.
> 
> IA64 ftrace support was added earlier this year, but it seems it can't
> be enabled anymore since the big config option reshuffle.  Now tracing
> support requires the architecture to define the TRACE_IRQFLAGS_SUPPORT
> and STACKTRACE_SUPPORT symbols, which seems to be missing on ia64.

Where are we at with this one, I'd like to get this in for XFS but I
agree w/ Felix that throwing out a "working" trace infrastructure w/
nothing to replace it on ia64 would not be great.

Is this just config confusion, or is the functionality actually missing
on ia64?

Thanks,
-Eric

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