linux-kernel - Re: [GIT PULL] ftrace: Updates for v6.14

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Message-ID: <20250218112602.5611754e@gandalf.local.home>
Date: Tue, 18 Feb 2025 11:26:02 -0500
From: Steven Rostedt <rostedt@...dmis.org>
To: Heiko Carstens <hca@...ux.ibm.com>
Cc: Masami Hiramatsu <mhiramat@...nel.org>, Linus Torvalds
 <torvalds@...ux-foundation.org>, LKML <linux-kernel@...r.kernel.org>, Mark
 Rutland <mark.rutland@....com>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Sven Schnelle <svens@...ux.ibm.com>,
 Vasily Gorbik <gor@...ux.ibm.com>, Alexander Gordeev
 <agordeev@...ux.ibm.com>
Subject: Re: [GIT PULL] ftrace: Updates for v6.14

On Mon, 17 Feb 2025 13:38:30 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Mon, 17 Feb 2025 12:49:18 +0100
> Heiko Carstens <hca@...ux.ibm.com> wrote:
> 
> > $ cat /sys/kernel/debug/tracing/current_tracer
> > nop
> > 
> > Bisected to commit 4346ba160409 ("fprobe: Rewrite fprobe on function-graph
> > tracer"). Before this commit there were no ftrace enabled functions after the
> > test suite finished:
> > 
> > $ wc -l /sys/kernel/debug/tracing/enabled_functions
> > 0 /sys/kernel/debug/tracing/enabled_functions
> > 
> > This is on s390 with defconfig.  
> 
> Thanks, I can reproduce it on x86 (I didn't check that commit though).
> 
> I'll take a look.

I think I found 3 different bugs in the accounting of what is registered
and what is not. I'll post a patch series shortly. Two in the function
graph tracer subops accounting, and one in the fprobe accounting.

-- Steve