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Re: [RFC][PATCH 5/7] VPIDs: vpid/pid conversion in VPID enabled case [message #1175 is a reply to message #1174]

Thu, 02 February 2006 19:29

serue
Messages: 750
Registered: February 2006

Senior Member

Quoting Dave Hansen (haveblue@us.ibm.com):
> 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

And in particular, is there any functionality which you could not
implement by using this approach, which you can implement with the
pid_to_vpid approach?

thanks,
-serge

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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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