linux-kernel - Re: [RFC] [Patch 0/21] Non disruptive application core dump infrastructure

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Date:	Tue, 14 Dec 2010 17:28:09 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	"Suzuki K. Poulose" <suzuki@...ibm.com>,
	linux-kernel@...r.kernel.org,
	Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>,
	Christoph Hellwig <hch@....de>,
	Masami Hiramatsu <mhiramat@...hat.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Daisuke HATAYAMA <d.hatayama@...fujitsu.com>,
	Andi Kleen <andi@...stfloor.org>,
	Roland McGrath <roland@...hat.com>,
	Amerigo Wang <amwang@...hat.com>,
	KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [RFC] [Patch 0/21] Non disruptive application core dump infrastructure

Hello, Linus.

On 12/14/2010 05:19 PM, Linus Torvalds wrote:
> On Tue, Dec 14, 2010 at 8:03 AM, Tejun Heo <tj@...nel.org> wrote:
>>
>> I think a better way would be adding a ptrace attach which is nestable
>> and doesn't have the nasty side effect caused by the interactions
>> between the implicit SIGSTOP and group stop.
> 
> Don't we already nest at least to some degree? At least you can strace
> a gdb session or another strace, no?

Yes, it depends on what the 'nesting' means.  I was thinking about
gcore'ing or attching gdb to an already strace'd process.  This might
not be strictly necessary but for ptrace attach to be transparent, we
need another PTRACE_* call anyway as PTRACE_ATTACH implies SIGSTOP and
having nestable attach would be beneficial in several use cases
including using debugging tools nested and allowing userland
checkpointing of debugging sessions.

Thanks.

-- 
tejun
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