linux-kernel - Re: [PATCH 06/10] signal: fix premature completion of group stop when interfered by ptrace

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Date:	Mon, 31 Jan 2011 12:00:07 +0100
From:	Tejun Heo <tj@...nel.org>
To:	Roland McGrath <roland@...hat.com>
Cc:	oleg@...hat.com, jan.kratochvil@...hat.com,
	linux-kernel@...r.kernel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org
Subject: Re: [PATCH 06/10] signal: fix premature completion of group stop
 when interfered by ptrace

Hello,

On Fri, Jan 28, 2011 at 01:22:57PM -0800, Roland McGrath wrote:
> It feels nasty to add a word to task_struct just for this.
> I don't see another place to store such bookkeeping bits.

I have plans on separate out ptrace related stuff from task_struct so
that they're allocate iff they're used which will save some tens of
bytes on the task struct, so there at least is a plan to compensate
for the added cruft.

> But I'm not entirely convinced that we'll really need them when we
> conclude on fully cleaning up the whole picture.

I really don't know at this point.  I tried to make it share one of
the related fields but there needs to be a per-task field which is
protected by siglock and there currently isn't any, so...

Thanks.

-- 
tejun
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