linux-kernel - Re: [patch 07/41] x86/apic: Remove the duplicated tracing version of local_timer

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Message-ID: <20170825112921.408a5205@gandalf.local.home>
Date:   Fri, 25 Aug 2017 11:29:21 -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 07/41] x86/apic: Remove the duplicated tracing version
 of local_timer_interrupt

On Fri, 25 Aug 2017 12:31:10 +0200
Thomas Gleixner <tglx@...utronix.de> wrote:

> The two NOP5 are noise in the rest of the work which is done by the timer
> interrupt and modern CPUs are pretty good in optimizing nops.
> 
> Get rid of the interrupt handler duplication and move the tracepoints into
> the regular handler.
> 
> Signed-off-by: Thomas Gleixner <tglx@...utronix.de>

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

-- Steve