linux-kernel - Re: [REPOST PATCH] ftrace: Calculate the correct dyn

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Date:	Thu, 22 Oct 2015 13:14:07 +0800
From:	Minfei Huang <mnfhuang@...il.com>
To:	Steven Rostedt <rostedt@...dmis.org>
Cc:	mingo@...hat.com, tglx@...utronix.de, hpa@...or.com,
	x86@...nel.org, linux-kernel@...r.kernel.org, mhuang@...hat.com
Subject: Re: [REPOST PATCH] ftrace: Calculate the correct dyn_ftrace number
 to report to the userspace

On 10/15/15 at 10:25pm, Steven Rostedt wrote:
> On Thu, 17 Sep 2015 00:19:42 +0800
> Minfei Huang <mnfhuang@...il.com> wrote:
> 
> > Now, ftrace only calculate the dyn_ftrace number in the adding
> > breakpoint loop, not in adding update and finish update loop.
> > 
> > Calculate the correct dyn_ftrace, once ftrace reports the failure message
> > to the userspace.
> > 
> 
> Bah, your emails got lost in my Inbox. Sorry about that.
> 
> I'll make an effort to look at this first thing tomorrow.

Ping. Any comment is appreciate.

Thanks
Minfei

> 
> [ Cc'ing myself to remind me ]
> 
> -- Steve
> 
> > Signed-off-by: Minfei Huang <mnfhuang@...il.com>
> > ---
> >  arch/x86/kernel/ftrace.c | 4 ++++
> >  1 file changed, 4 insertions(+)
> > 
> > diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
> > index 8b7b0a5..311bcf3 100644
> > --- a/arch/x86/kernel/ftrace.c
> > +++ b/arch/x86/kernel/ftrace.c
> > @@ -556,6 +556,7 @@ void ftrace_replace_code(int enable)
> >  	run_sync();
> >  
> >  	report = "updating code";
> > +	count = 0;
> >  
> >  	for_ftrace_rec_iter(iter) {
> >  		rec = ftrace_rec_iter_record(iter);
> > @@ -563,11 +564,13 @@ void ftrace_replace_code(int enable)
> >  		ret = add_update(rec, enable);
> >  		if (ret)
> >  			goto remove_breakpoints;
> > +		count++;
> >  	}
> >  
> >  	run_sync();
> >  
> >  	report = "removing breakpoints";
> > +	count = 0;
> >  
> >  	for_ftrace_rec_iter(iter) {
> >  		rec = ftrace_rec_iter_record(iter);
> > @@ -575,6 +578,7 @@ void ftrace_replace_code(int enable)
> >  		ret = finish_update(rec, enable);
> >  		if (ret)
> >  			goto remove_breakpoints;
> > +		count++;
> >  	}
> >  
> >  	run_sync();
> 
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