linux-kernel - Re: [PATCH 0/5 v2] Binary ftrace

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Date:	Fri, 6 Mar 2009 12:58:22 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Peter Zijlstra <peterz@...radead.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/5 v2] Binary ftrace_printk


* Frederic Weisbecker <fweisbec@...il.com> wrote:

> On Thu, Mar 05, 2009 at 05:53:58AM +0100, Frederic Weisbecker wrote:
> > 
> > This new iteration addresses Steven's reviews.
> > Notably:
> > 
> > - only build the ftrace_printk format section if CONFIG_TRACING is set
> > - be scheduler tracing safe (don't use preempt_enable directly from
> >   ftrace_printk to avoid tracing recursion)
> > - fix a loss of format string when a module is unloaded. Since we can loose
> >   it on the ring-buffer if it is in overwrite mode, we don't keep track
> >   of the format given by the modules to free them. We just copy their
> >   ftrace_printk string format forever. Note that it is safe against duplicate
> >   strings since we verify if the string is already present in our list before
> >   allocating a new one.
> > 
> > ---
> 
> 
> tip:master has seen some changes concerning the tracing bits 
> since this patchset submission, notably the movement of 
> ftrace_printk to include/kernel.h
> 
> These patches probably won't anymore apply properly. Do you 
> want me to rebase them against latest tip/master?

Yeah, please do. (Would there be a way for you to submit via 
tools that preserve the email-threading of the patches? Right 
now your mails come in separate threads each.)

> Or perhaps you prefer to wait for a Acked-by from Linus or 
> Andrew?

The current lineup looks pretty good to me.

Patch #1 is what modifies lib/vsprintf.c and unless Linus or 
Andrew objects i plan to put that into tip:core/printk so that 
it's not embedded in the tracing tree and sent upstream 
separately.

Then i'll merge that branch into the tracing tree and apply 
patches #2...#5. So as long as you send against tip:master (i.e. 
against the latest tracing bits) i'll be able to sort it out 
neatly.

	Ingo
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