linux-kernel - Re: [PATCH 3/4] x86: Add trace point for MSR accesses

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Message-ID: <20151020153909.04942f11@gandalf.local.home>
Date:	Tue, 20 Oct 2015 15:39:09 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	x86@...nel.org, peterz@...radead.org, linux-kernel@...r.kernel.org,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 3/4] x86: Add trace point for MSR accesses

On Tue, 20 Oct 2015 11:40:45 -0700
Andi Kleen <andi@...stfloor.org> wrote:


> diff --git a/include/trace/events/msr.h b/include/trace/events/msr.h

Architecture specific tracepoints should not exist in include/trace.
Please move this to arch/x86/lib (or some other x86 directory).

See samples/trace_events/ for how to have a header outside of
include/trace.

-- Steve


> new file mode 100644
> index 0000000..b2232b5
> --- /dev/null
> +++ b/include/trace/events/msr.h
> @@ -0,0 +1,51 @@
> +#undef TRACE_SYSTEM
> +#define TRACE_SYSTEM msr
> +
> +#if !defined(_TRACE_MSR_H) || defined(TRACE_HEADER_MULTI_READ)
> +#define _TRACE_MSR_H
> +
> +#include <linux/tracepoint.h>
> +
> +/*
> + * Tracing for x86 model specific registers. Directly maps to the
> + * RDMSR/WRMSR instructions.
> + */
> +
> +DECLARE_EVENT_CLASS(msr_trace_class,
> +	    TP_PROTO(unsigned msr, u64 val, int failed),
> +	    TP_ARGS(msr, val, failed),
> +	    TP_STRUCT__entry(
> +		    __field(	unsigned,	msr )
> +		    __field(    u64,		val )
> +		    __field(    int,		failed )
> +	    ),
> +	    TP_fast_assign(
> +		    __entry->msr = msr;
> +		    __entry->val = val;
> +		    __entry->failed = failed;
> +	    ),
> +	    TP_printk("%x, value %llx%s",
> +		      __entry->msr,
> +		      __entry->val,
> +		      __entry->failed ? " #GP" : "")
> +);
> +
> +DEFINE_EVENT(msr_trace_class, read_msr,
> +	     TP_PROTO(unsigned msr, u64 val, int failed),
> +	     TP_ARGS(msr, val, failed)
> +);
> +
> +DEFINE_EVENT(msr_trace_class, write_msr,
> +	     TP_PROTO(unsigned msr, u64 val, int failed),
> +	     TP_ARGS(msr, val, failed)
> +);
> +
> +DEFINE_EVENT(msr_trace_class, rdpmc,
> +	     TP_PROTO(unsigned msr, u64 val, int failed),
> +	     TP_ARGS(msr, val, failed)
> +);
> +
> +#endif /* _TRACE_MSR_H */
> +
> +/* This part must be outside protection */
> +#include <trace/define_trace.h>

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