linux-kernel - Re: [PATCH V3] trace/events: add chip name and hwirq to irq entry tracepoint

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Date:	Wed, 8 Jul 2015 11:56:33 -0600
From:	"Ankit Gupta" <ankgupta@...eaurora.org>
To:	"Thomas Gleixner" <tglx@...utronix.de>
Cc:	"Steven Rostedt" <rostedt@...dmis.org>,
	"Ankit Gupta" <ankgupta@...eaurora.org>, mingo@...hat.com,
	agross@...eaurora.org, davem@...emloft.net, rdunlap@...radead.org,
	standby24x7@...il.com, sboyd@...eaurora.org,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
	gavidov@...eaurora.org, sdharia@...eaurora.org,
	linux-arm-msm@...r.kernel.org, mlocke@...eaurora.org
Subject: Re: [PATCH V3] trace/events: add chip name and hwirq to irq entry
 tracepoint

> On Wed, 24 Jun 2015, Steven Rostedt wrote:
>> > +
>> > +#define show_chip_name(irq)					\
>> > +	(irq_get_irq_data(irq)					\
>> > +			 ? irq_get_irq_data(irq)->chip->name	\
>> > +			 : "NULL")
>> > +
>> > +#define show_hwirq(irq)						\
>> > +	(irq_get_irq_data(irq)					\
>> > +			 ? irq_get_irq_data(irq)->hwirq		\
>> > +			 : -ENODEV)
>>
>> Note these magic functions will only be useful for the tracefs reads of
>> the trace files. Userspace tools that extract the data (like perf and
>> trace-cmd), will have no idea of how to parse it.
>>
>> I'm not against doing this, but I'm just letting you know what the
>> effect of this change will be.
>
> What's worse is, that they are racy against a concurrent teardown of
> the interrupt. Not a good idea ...
>

Agree, I'll save the chip-name and hwirq in the struct. This technique
using the same macros to save the chip-name and hwirq in the struct also
works well with trace-cmd.

Thanks,
Ankit and Gilad

> Thanks,
>
> 	tglx
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