[Devel] [RFC PATCH v8 0/5] IPC: checkpoint/restore in userspace enhancements

[Stanislav Kinsbursky]

19.12.2012 00:36, Andrew Morton пишет:
> On Wed, 24 Oct 2012 19:34:51 +0400
> Stanislav Kinsbursky <skinsbursky at parallels.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?

Hello, Andrew.
Fengguang's issue was solved by "ipc: simplify message copying" I sent you.
But I can't find Sasha's issue. As I remember, there was some problem in 
early
version of the patch set. But I believe its fixed now.