linux-kernel - Re: [RFC PATCH v8 0/5] IPC: checkpoint/restore in userspace enhancements

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Message-Id: <20121218123601.113a29c0.akpm@linux-foundation.org>
Date:	Tue, 18 Dec 2012 12:36:01 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Stanislav Kinsbursky <skinsbursky@...allels.com>
Cc:	serge.hallyn@...onical.com, ebiederm@...ssion.com,
	linux-kernel@...r.kernel.org, xemul@...allels.com,
	catalin.marinas@....com, will.deacon@....com, jmorris@...ei.org,
	cmetcalf@...era.com, joe.korty@...r.com, dhowells@...hat.com,
	dledford@...hat.com, viro@...iv.linux.org.uk,
	kosaki.motohiro@...fujitsu.com, linux-api@...r.kernel.org,
	serue@...ibm.com, tglx@...utronix.de, paulmck@...ux.vnet.ibm.com,
	devel@...nvz.org, mtk.manpages@...il.com,
	Sasha Levin <sasha.levin@...cle.com>,
	Wu Fengguang <fengguang.wu@...el.com>
Subject: Re: [RFC PATCH v8 0/5] IPC: checkpoint/restore in userspace
 enhancements

On Wed, 24 Oct 2012 19:34:51 +0400
Stanislav Kinsbursky <skinsbursky@...allels.com> wrote:

> This respin of the patch set was significantly reworked. Most part of new API
> was replaced by sysctls (by one per messages, semaphores and shared memory),
> allowing to preset desired id for next new IPC object.
> 
> This patch set is aimed to provide additional functionality for all IPC
> objects, which is required for migration of these objects by user-space
> checkpoint/restore utils (CRIU).
> 
> The main problem here was impossibility to set up object id. This patch set
> solves the problem by adding new sysctls for preset of desired id for new IPC
> object.
> 
> Another problem was to peek messages from queues without deleting them.
> This was achived by introducing of new MSG_COPY flag for sys_msgrcv(). If
> MSG_COPY flag is set, then msgtyp is interpreted as message number.

According to my extensive records, Sasha hit a bug in
ipc-message-queue-copy-feature-introduced.patch and Fengguang found a
bug in
ipc-message-queue-copy-feature-introduced-cleanup-do_msgrcv-aroung-msg_copy-feature.patch

It's not obvious (to me) that these things have been identified and
fixed.  What's the status, please?

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