Kirill Korotaev wrote:
Cedric Le Goater wrote:
Pierre Peiffer wrote:
This patch adds a new IPC_SETID command to the System V IPCs set of
commands, which allows to change the ID of an existing IPC.
This command can be used through the semctl/shmctl/msgctl API, with the new
ID passed as the third argument for msgctl and shmctl (instead of a
pointer) and through the fourth argument for semctl.
To be successful, the following rules must be respected:
- the IPC exists
- the user must be allowed to change the IPC attributes regarding the IPC
permissions.
- the new ID must satisfy the ID computation rule.
- the entry (in the kernel internal table of IPCs) corresponding to the new
ID must be free.
That's an interesting way to reset the ids of sysv ipcs during a restart (after
a checkpoint) and we're looking for ways to do that among other things.
How does it fit openvz ? Is it something openvz could use ?
my personal imho is that we should not export such interfaces to user space
and do the checkpointing from the kernel.
it simplifies a lot of things and makes checkpointing more elegant.
So until there is some user-space usage scenario of the patch I missed -
i wouldn't commit it.
Hi Kirill,
I have no particular preference about checkpointing from userspace or
kernelspace. Can you explain why doing the checkpoint from kernel
simplifies the problem ? Do you have some examples about resources
checkpointed from kernel which make the job easier ?
I thought we can divide system into subsystem and use the generic
netlink to define a family for each subsystem. The result will be a
checkpoint orchestrated from userspace but checkpointed from kernel.
-- Daniel
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