linux-kernel - Re: [PATCHSET ptrace] ptrace: implement PTRACE_SEIZE/INTERRUPT and group stop notification, take#2

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Message-Id: <201105200045.44333.vda.linux@googlemail.com>
Date:	Fri, 20 May 2011 00:45:44 +0200
From:	Denys Vlasenko <vda.linux@...glemail.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Tejun Heo <tj@...nel.org>, oleg@...hat.com,
	jan.kratochvil@...hat.com, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, indan@....nu, bdonlan@...il.com
Subject: Re: [PATCHSET ptrace] ptrace: implement PTRACE_SEIZE/INTERRUPT and group stop notification, take#2

On Thursday 19 May 2011 17:04, Linus Torvalds wrote:
> On Mon, May 16, 2011 at 11:17 AM, Tejun Heo <tj@...nel.org> wrote:
> >
> > This is the second try at implementing PTRACE_SEIZE/INTERRUPT and
> > group stop notification.  Notable changes from the first take[1] are,
> >
> > * Prep patches moved to a separate patchset[2].
> 
> So having followed the discussion so far, quite frankly I'm not
> convinced this series is 2.6.40 material.
> 
> I think that conceptually the split-up of PTRACE_ATTACH into
> SEIZE/INTERRUPT might be fine, but I don't think the interface is
> necessarily cooked, and perhaps more importantly I'm not at all sure
> that the (few) current users of ptrace() would even switch over.

I will push strace to at least use what we already have (TRACESYSGOOD etc).

> So I think Oleg's branch with cleanups is probably ready, and maybe a
> few of the preparatory patches from this branch can be merged, but I
> would _strongly_ suggest that the plan for 2.6.40 should be to not
> actually mess with interfaces to the kernel, but just cleaning up the
> actual internal implementation. I would like to keep 2.6.40 small and
> simple.

strace wasn't handling ^Z correctly for many years. It definitely can wait
for another kernel release cycle.

-- 
vda
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