linux-kernel - Re: [PATCH 2/2] IPC: message queue stealing feature introduced

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Message-ID: <4F7D79C3.1010306@parallels.com>
Date:	Thu, 05 Apr 2012 14:53:55 +0400
From:	Stanislav Kinsbursky <skinsbursky@...allels.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	"serge.hallyn@...onical.com" <serge.hallyn@...onical.com>,
	"criu@...nvz.org" <criu@...nvz.org>,
	"lucas.demarchi@...fusion.mobi" <lucas.demarchi@...fusion.mobi>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"cmetcalf@...era.com" <cmetcalf@...era.com>,
	"dhowells@...hat.com" <dhowells@...hat.com>,
	Michael Kerrisk <mtk.manpages@...il.com>,
	Arnd Bergmann <arnd@...db.de>
Subject: Re: [PATCH 2/2] IPC: message queue stealing feature introduced

05.04.2012 03:12, Andrew Morton пишет:
>
> I'd be a bit more comfortable if there was some sign that other c/r
> developers have reviewed and tested this and have successfully used it
> in c/r operation testing?
>

We have a user-space test (part of our regression testing test suite) for this 
functionality. Thus we run this test very ofter.

> We've been trying to isolate the c/r-specific functions inside #ifdef
> CONFIG_CHECKPOINT_RESTORE, but this patch doesn't do that.  I have been
> encouraging this isolation so that people who aren't using c/r don't
> have to carry the overhead it adds and so that we can more easily hunt
> down and remove everything if the entire c/r project doesn't work out
> successfully.
>

Sorry. I'll add this ifdef's and send rebased patch set once more.

> This patch modifies the sys_msgrcv() API and so we should update the
> manpage for that syscall.  Please work with Michael on this.
>

Sure.

> What does all the compat fiddling actually do?  I guess it's needed for
> checkpoint and restore of 32-bit userspace on 64-bit kernels?  Does c/r
> as a whole support that?  It should.  How well tested is this?
>

CRIU doesn't support 32-bit processes migration yet. But we are going to add 
this support in future.

-- 
Best regards,
Stanislav Kinsbursky
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