linux-kernel - Re: [PATCH 3/3] utrace-based ftrace "process" engine, v2

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Date:	Sun, 22 Mar 2009 01:37:59 +0300
From:	Alexey Dobriyan <adobriyan@...il.com>
To:	"Frank Ch. Eigler" <fche@...hat.com>,
	Roland McGrath <roland@...hat.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>, utrace-devel@...hat.com,
	linux-kernel@...r.kernel.org,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 3/3] utrace-based ftrace "process" engine, v2

On Sat, Mar 21, 2009 at 06:20:30PM -0400, Frank Ch. Eigler wrote:
> On Sat, Mar 21, 2009 at 03:02:59PM -0700, Linus Torvalds wrote:
> > [...]
> > > The thing is, utrace crashes in Fedora have dominated kerneloops.org 
> > > for many months [...]
> > 
> > .. and dammit, I agree 100%. If utrace really shows up in _any_ way on 
> > kerneloops.org, then I think THE ENTIRE DISCUSSION in this thread is moot. 
> 
> There was a short span of time during last fall, when Roland was on
> vacation.  That bug (in 2.6.26.3) was fixed during the kernel summit.
> So this is a six-month obsolete grievance.

struct task_struct::utrace became embedded struct. This is good and
should remove quite a few of utrace bugs. Better late than never.

However, "rewrite-ptrace-via-utrace" patch was omitted, so almost noone
can easily see by how much situation improved.

I see this patch was dropped in Fedora.

Will ptrace(2) will be rewritten through utrace?
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