Re: [RFC PATCH v8 0/5] IPC: checkpoint/restore in userspaceenhancements

From: Andrew Morton
Date: Tue Dec 18 2012 - 15:35:56 EST

On Wed, 24 Oct 2012 19:34:51 +0400
Stanislav Kinsbursky <skinsbursky@xxxxxxxxxxxxx> 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

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

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