* c/r, time, and virtualization
@ 2009-07-25 5:11 Oren Laadan
[not found] ` <4A6A93FC.7090209-RdfvBDnrOixBDgjK7y7TUQ@public.gmane.org>
0 siblings, 1 reply; 2+ messages in thread
From: Oren Laadan @ 2009-07-25 5:11 UTC (permalink / raw)
To: Linux Containers, Eric W. Biederman; +Cc: Jeff Dike
Hi,
I wonder what's that status of time namespaces and virtual time(rs) ?
http://lwn.net/Articles/180375/ - "virtual time" coverage in LWN (2006)
http://lkml.org/lkml/2006/4/13/172 - patchset and thread on LKML
http://lwn.net/Articles/249080/ - kernel summit 2007 - containers
It will be handy for c/r of timers (posix-timers) that I'm working on.
A couple of obstacles off the top of my head:
- Lack of clone flags -- we can use clone_with_pids() for that.
- Fast gettimeofday() via vdso -- perhaps a vdso page per time-ns
(containing the necessary deltas).
Is anyone working on it ?
Oren.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: c/r, time, and virtualization
[not found] ` <4A6A93FC.7090209-RdfvBDnrOixBDgjK7y7TUQ@public.gmane.org>
@ 2009-07-25 7:26 ` Eric W. Biederman
0 siblings, 0 replies; 2+ messages in thread
From: Eric W. Biederman @ 2009-07-25 7:26 UTC (permalink / raw)
To: Oren Laadan; +Cc: Linux Containers, Jeff Dike
Oren Laadan <orenl-RdfvBDnrOixBDgjK7y7TUQ@public.gmane.org> writes:
> Hi,
>
> I wonder what's that status of time namespaces and virtual time(rs) ?
>
> http://lwn.net/Articles/180375/ - "virtual time" coverage in LWN (2006)
> http://lkml.org/lkml/2006/4/13/172 - patchset and thread on LKML
> http://lwn.net/Articles/249080/ - kernel summit 2007 - containers
>
> It will be handy for c/r of timers (posix-timers) that I'm working on.
>
> A couple of obstacles off the top of my head:
>
> - Lack of clone flags -- we can use clone_with_pids() for that.
>
> - Fast gettimeofday() via vdso -- perhaps a vdso page per time-ns
> (containing the necessary deltas).
>
> Is anyone working on it ?
I proposed it, for the reason you care.
I have thought about the semantics.
But I haven't gotten as far as implementing something.
I will be happy to bounce ideas off, and review code
when I have a few seconds free.
Eric
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2009-07-25 5:11 c/r, time, and virtualization Oren Laadan
[not found] ` <4A6A93FC.7090209-RdfvBDnrOixBDgjK7y7TUQ@public.gmane.org>
2009-07-25 7:26 ` Eric W. Biederman
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