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Re: [RFC][PATCH] VPIDs: Virtualization of PIDs (OpenVZ approach) [message #1211 is a reply to message #1197]

Fri, 03 February 2006 12:45

Alexey Kuznetsov
Messages: 18
Registered: February 2006

Junior Member

Hello!

> - hierarchical structure (it's flat, only one level)

Er... if I understand the question correctly, it is not flat,
it is rather universal.

The main idea of the VPID approach is that it _preserves_ existing
logic completely, all the references, interprocess linkage and process
grouping are made using usual unique pids.

Virtual pids are just the numbers, which user level applications see.
Of course, they depend on the point where you view from.

> - a proper administration scheme

There is nothing to administrate. pids are generated and assigned
automatically.

Virtual pids come to the game only when you move a process from
one host to another, new process is created with do_fork_pid(),
which assignes the same virtual pid and generates brand new global pid,
unique for destination host.

> - a 'view' into the child pid spaces

In order to access a virtual pid space the process must enter
the corresponding container. You are not going to add the whole set
of syscalls, which use not only pid but also a container identifier, right?

For purpose of debugging, vpids are shown /proc/*/status, it is enough.

> - handling of inter context signalling

Not an issue. All the inter-container communication is made using
global pids.

It is necessary to emphasize again, VPID patch _preserves_ currently
existing capabilities: all the processes in all the containers
can be accessed by global pids. F.e. plain "ps axf" executed in "initial
container" shows the whole process tree.

It is one of main points: "virtual" pids are not used to _limit_ access,
is not a "no go" thing, it allows to go on when we have to reinstate
VPS at another host. Access checks are not based on some pids, they
are defined by policy rules, which are checked after corresponding
objects (tasks in our case) are found.

> and, more important, it does not deal with the existing
> issues and error cases, where references to pids, tasks,
> task groups and sessions aren't handled properly ...

I am sorry, I am not aware about such bugs (expect for a few well-known
cases, when someone holds a pid, which can remain stray and be recycled.
But it is apparently orthogonal to the problem under duscussion).
If they do exist they apparently must be fixed asap not depending
on anything else.

Alexey

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[Message index]

		[RFC][PATCH] VPIDs: Virtualization of PIDs (OpenVZ approach) By: Kirill Korotaev on Thu, 02 February 2006 15:54
		[RFC][PATCH 1/7] VPIDs: add VPID config option By: dev on Thu, 02 February 2006 16:16
		[RFC][PATCH 2/7] VPIDs: pid/vpid conversions By: dev on Thu, 02 February 2006 16:21
		Re: [RFC][PATCH 2/7] VPIDs: pid/vpid conversions By: ebiederm on Wed, 08 February 2006 20:29
		Re: [RFC][PATCH 2/7] VPIDs: pid/vpid conversions By: Alexey Kuznetsov on Wed, 08 February 2006 23:53
		Re: [RFC][PATCH 2/7] VPIDs: pid/vpid conversions By: ebiederm on Thu, 09 February 2006 00:37
		Re: [RFC][PATCH 2/7] VPIDs: pid/vpid conversions By: Alexey Kuznetsov on Thu, 09 February 2006 01:11
		Re: [RFC][PATCH 2/7] VPIDs: pid/vpid conversions By: ebiederm on Thu, 09 February 2006 01:36
		Re: [RFC][PATCH 2/7] VPIDs: pid/vpid conversions By: serue on Thu, 09 February 2006 02:51
		Re: [RFC][PATCH 2/7] VPIDs: pid/vpid conversions By: Alexey Kuznetsov on Thu, 09 February 2006 09:55
		Re: [RFC][PATCH 2/7] VPIDs: pid/vpid conversions By: ebiederm on Thu, 09 February 2006 19:22
		Re: [RFC][PATCH 2/7] VPIDs: pid/vpid conversions By: dev on Mon, 20 February 2006 14:55
		Re: [RFC][PATCH 2/7] VPIDs: pid/vpid conversions By: Herbert Poetzl on Mon, 20 February 2006 16:56
		Re: [RFC][PATCH 2/7] VPIDs: pid/vpid conversions By: dev on Tue, 21 February 2006 16:17
		Re: [RFC][PATCH 2/7] VPIDs: pid/vpid conversions By: Herbert Poetzl on Tue, 21 February 2006 23:17
		[RFC][PATCH 3/7] VPIDs: fork modifications By: dev on Thu, 02 February 2006 16:24
		Re: [RFC][PATCH 3/7] VPIDs: fork modifications By: Cedric Le Goater on Thu, 02 February 2006 20:08
		[RFC][PATCH 4/7] VPIDs: vpid macros in non-VPID case By: Kirill Korotaev on Thu, 02 February 2006 16:26
		[RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Kirill Korotaev on Thu, 02 February 2006 16:30
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Dave Hansen on Thu, 02 February 2006 17:05
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: serue on Thu, 02 February 2006 19:29
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Alexey Kuznetsov on Fri, 03 February 2006 10:52
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Cedric Le Goater on Fri, 03 February 2006 12:48
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Alexey Kuznetsov on Fri, 03 February 2006 14:02
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Dave Hansen on Fri, 03 February 2006 16:25
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Alexey Kuznetsov on Mon, 06 February 2006 11:24
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Cedric Le Goater on Fri, 03 February 2006 17:05
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Alexey Kuznetsov on Mon, 06 February 2006 09:48
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: serue on Mon, 06 February 2006 14:51
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Alexey Kuznetsov on Mon, 06 February 2006 15:51
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: serue on Mon, 06 February 2006 16:24
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Cedric Le Goater on Tue, 07 February 2006 09:46
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: dev on Tue, 07 February 2006 11:42
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Cedric Le Goater on Tue, 07 February 2006 12:59
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Cedric Le Goater on Tue, 07 February 2006 09:15
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: dev on Fri, 03 February 2006 14:03
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Cedric Le Goater on Fri, 03 February 2006 15:40
		Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case By: Kirill Korotaev on Fri, 03 February 2006 16:26
		[RFC][PATCH 6/7] VPIDs: small proc VPID export By: Kirill Korotaev on Thu, 02 February 2006 16:31
		[RFC][PATCH 7/7] VPIDs: required VPS interface for VPIDs By: Kirill Korotaev on Thu, 02 February 2006 16:32
		Re: [RFC][PATCH] VPIDs: Virtualization of PIDs (OpenVZ approach) By: Herbert Poetzl on Fri, 03 February 2006 03:01
		Re: [RFC][PATCH] VPIDs: Virtualization of PIDs (OpenVZ approach) By: Kirill Korotaev on Fri, 03 February 2006 10:30
		Re: [RFC][PATCH] VPIDs: Virtualization of PIDs (OpenVZ approach) By: Alexey Kuznetsov on Fri, 03 February 2006 12:45

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