linux-kernel - Re: [RFC] trace_irqsoff: remove redundant reset per-CPU buff

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Message-ID: <20160205094040.2eb15c51@gandalf.local.home>
Date:	Fri, 5 Feb 2016 09:40:40 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Dmitry Safonov <0x7f454c46@...il.com>
Cc:	mingo@...hat.com, linux-kernel@...r.kernel.org
Subject: Re: [RFC] trace_irqsoff: remove redundant reset per-CPU buff

On Fri, 5 Feb 2016 14:52:53 +0300
Dmitry Safonov <0x7f454c46@...il.com> wrote:

> 2016-02-05 5:40 GMT+03:00 Steven Rostedt <rostedt@...dmis.org>:
> > On Mon, 19 Oct 2015 21:10:26 +0300
> > Dmitry Safonov <0x7f454c46@...il.com> wrote:
> >  
> >>   There is no reason to do it twice: from commit b6f11df26fdc28
> >> ("trace: Call tracing_reset_online_cpus before tracer->init()")
> >> resetting of per-CPU buffers done before tracer->init() call.
> >>
> >> tracer->init() calls {irqs,preempt,preemptirqs}off_tracer_init() and it
> >> calls __irqsoff_tracer_init(), which resets per-CPU ringbuffer second
> >> time.
> >> It's slowpath, but anyway.  
> >
> > Bah, I said I'd look at this and I did. But never added it to my queue.
> > It's not a big deal as this is the slow path but it makes sense. I knew
> > there was a patch from you to get but saw the TP_ARGS redefining patch
> > and thought that was it.  
> 
> Thanks, Steve!
> Yeah, I know it may take time to get to unimportant patches
> that are also mostly cleanups.
> Don't worry, please, take a glance when you'll have time on these
> small also not important cleanings (I'm fine if you'll drop them all):
> https://lkml.org/lkml/2015/11/20/290
> https://lkml.org/lkml/2015/11/20/291
> https://lkml.org/lkml/2015/10/30/580

I'm slowing going through my INBOX (doing clean up to see what I
missed). I'm currently at 11/10. I marked your 10/30 one already as a
"go back and look at later".

-- Steve