linux-kernel - Re: Getting rid of dynamic TASK

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Date:	Tue, 10 May 2016 20:20:55 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Andy Lutomirski <luto@...capital.net>
Cc:	Dmitry Safonov <0x7f454c46@...il.com>,
	Ruslan Kabatsayev <b7.10110111@...il.com>,
	X86 ML <x86@...nel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Borislav Petkov <bp@...en8.de>,
	Pavel Emelyanov <xemul@...allels.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>
Subject: Re: Getting rid of dynamic TASK_SIZE (on x86, at least)

On 05/10, Andy Lutomirski wrote:
>
>  - xol_add_vma: This one is weird: uprobes really is doing something
> behind the task's back, and the addresses need to be consistent with
> the address width.  I'm not quite sure what to do here.

It can use mm->task_size instead, plus this is just a hint. And perhaps
mm->task_size should have more users, say get_unmapped_area...

Not sure we should really get rid of dynamic TASK_SIZE completely, but
personally I agree it looks a bit ugly.

Oleg.