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Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case [message #1174 is a reply to message #1158]

Thu, 02 February 2006 17:05

Dave Hansen
Messages: 240
Registered: October 2005

Senior Member

On Thu, 2006-02-02 at 19:30 +0300, Kirill Korotaev wrote:
> This is the main patch which contains all vpid-to-pid conversions
> and auxilliary stuff. Virtual pids are distinguished from real ones
> by the VPID_BIT bit set. Conversion from vpid to pid and vice versa
> is performed in two ways: fast way, when vpid and it's according pid
> differ only in VPID_BIT bit set ("linear" case), and more complex way,
> when pid may correspond to any vpid ("sparse" case) - in this case we
> use a hash-table based mapping.

This is an interesting approach. Could you elaborate a bit on on why
you need the two different approaches? What conditions cause the switch
to the sparse approach?

Also, if you could separate those two approaches out into two different
patches, it would be much easier to get a grasp about what's going on.
One of them is just an optimization, right?

Did you happen to catch Linus's mail about his preferred approach?

http://marc.theaimsgroup.com/?l=linux-kernel&m=113874154 731279&w=2

-- Dave

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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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