linux-kernel - Re: [PATCH 04/15] xen/trace: add multicall tracing

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Message-ID: <4E00D0BD.10509@goop.org>
Date:	Tue, 21 Jun 2011 10:11:25 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
CC:	Xen Devel <Xen-devel@...ts.xensource.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
Subject: Re: [PATCH 04/15] xen/trace: add multicall tracing

On 06/21/2011 06:52 AM, Konrad Rzeszutek Wilk wrote:
>> +TRACE_EVENT(xen_mc_entry,
>> +	    TP_PROTO(struct multicall_entry *mc, unsigned nargs),
>> +	    TP_ARGS(mc, nargs),
>> +	    TP_STRUCT__entry(
>> +		    __field(unsigned short, op)
>> +		    __field(unsigned short, nargs)
>> +		    __array(unsigned long, args, 6)
> Not 'unsigned long' for op?

I wanted to save space in the trace buffer.  I think hypercall numbers
are all small?

    J

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