linux-kernel - Re: [patch 05/41] x86/tracing: Introduce a static key for exception tracing

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Date:   Fri, 25 Aug 2017 11:24:01 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>, Peter Anvin <hpa@...or.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Andy Lutomirski <luto@...nel.org>,
        Borislav Petkov <bp@...en8.de>
Subject: Re: [patch 05/41] x86/tracing: Introduce a static key for exception
 tracing

On Fri, 25 Aug 2017 12:31:08 +0200
Thomas Gleixner <tglx@...utronix.de> wrote:

> Switching the IDT just for avoiding tracepoints creates a complete
> impenetrable macro/inline/ifdef mess.
> 
> There is no point in avoiding tracepoints for most of the traps/exceptions.
> For the more expensive tracepoints, like pagefaults, this can be handled with
> an explicit static key.
> 
> Preparatory patch to remove the tracing idt.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
> ---
>  arch/x86/include/asm/trace/common.h      |   15 +++++++++++++++
>  arch/x86/include/asm/trace/exceptions.h  |    4 +---
>  arch/x86/include/asm/trace/irq_vectors.h |    4 +---
>  arch/x86/kernel/tracepoint.c             |    9 ++++++++-
>  4 files changed, 25 insertions(+), 7 deletions(-)
> 
> --- /dev/null
> +++ b/arch/x86/include/asm/trace/common.h

Reviewed-by: Steven Rostedt (VMware) <rostedt@...dmis.org>

-- Steve