linux-kernel - Re: prctl(PR_SET

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Message-ID: <51277F77.2090908@redhat.com>
Date:	Fri, 22 Feb 2013 15:23:51 +0100
From:	Denys Vlasenko <dvlasenk@...hat.com>
To:	u3557@...lix.com.au
CC:	Amnon Shiloh <u3557@...o.sublimeip.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Pedro Alves <palves@...hat.com>,
	Jan Kratochvil <jan.kratochvil@...hat.com>,
	Cyrill Gorcunov <gorcunov@...nvz.org>,
	Pavel Emelyanov <xemul@...allels.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org
Subject: Re: prctl(PR_SET_MM)

On 02/19/2013 07:25 AM, Amnon Shiloh wrote:
> Steven Rostedt wrote:
> 
>> If only you, or a few people are using it (ie. distros don't see a
>> need), then it will be up to you to make the changes.
> 
> I believe that this functionality is of a general nature and is needed
> by many, not only by myself and by the CRIU group, but by all user-level
> software packages, past present and future, that provide some form or
> another of reconstructing a Linux process.

That's what "RESTORE" part of CONFIG_CHECKPOINT_RESTORE refers to:
the ability to restore (reconstruct) a process.

If you want to be able to restore a process, you need RESTORE
feature. It's that simple.

Why do you want yet another config option for it?
What's the problem if you simply enable CONFIG_CHECKPOINT_RESTORE?

The only problem I can imagine is "CONFIG_CHECKPOINT_RESTORE
enables too many things I don't need".

Frankly, I find it not very likely, unless you are planning
on working on resource-constrained machines (like mobile phone).

-- 
vda


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