linux-kernel - Re: [PATCH v2] trace/events: add chip name and hwirq to irq entry tracepoint

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Date:	Tue, 23 Jun 2015 09:16:39 -0600
From:	"Ankit Gupta" <ankgupta@...eaurora.org>
To:	"Thomas Gleixner" <tglx@...utronix.de>
Cc:	"Ankit Gupta" <ankgupta@...eaurora.org>, rostedt@...dmis.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 v2] trace/events: add chip name and hwirq to irq entry
 tracepoint

> On Mon, 22 Jun 2015, Ankit Gupta wrote:
>
>> Add chip name and hw-irq number to the trace_irq_handler_entry()
>> tracepoint. When tracing interrupt events the chip-name and hw-irq
>> numbers are stable and known in advance. This makes them a better
>> choice as a filtering criteria for the trace buffer dump. On the
>> flipside, the os-irq numbers are dynamically allocated which makes
>> them difficult to use for the same purpose.
>>
>> Dump messages will look like:
>> ...irq_handler_entry: irq=22 name=msm_serial0 domain=GIC hwirq=140

>
> I can't see the domain name being captured/printed in the code below.
>
>> -	TP_printk("irq=%d name=%s", __entry->irq, __get_str(name))
>> +	TP_printk("irq=%d name=%s chip_name=%s hwirq=%ld", __entry->irq,
>> +	  __get_str(name), show_chip_name(__entry->irq),
>> +	  show_hwirq(__entry->irq))
>>  );

Thanks Thomas for your comment. Its actually printing a chipname and not
the domain. Will correct the dump message in the next patch. It will print
as follow.
...irq_handler_entry: irq=22 name=msm_serial0 Chip=GIC hwirq=140

>
> Thanks,
>
> 	tglx
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