Messages in this thread | | | Subject | Re: [ckrm-tech] [PATCH] BC: resource beancounters (v4) (added user memory) | From | Chandra Seetharaman <> | Date | Thu, 14 Sep 2006 16:13:23 -0700 |
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On Wed, 2006-09-13 at 18:22 -0700, Rohit Seth wrote: <snip> > > > > Here are results of some of the benchmarks we have run in the past > > (April 2005) with CKRM which showed no/negligible performance impact in > > that scenario. > > http://marc.theaimsgroup.com/?l=ckrm-tech&m=111325064322305&w=2 > > http://marc.theaimsgroup.com/?l=ckrm-tech&m=111385973226267&w=2 > > http://marc.theaimsgroup.com/?l=ckrm-tech&m=111291409731929&w=2 > > > > > > These are good results. But I still think the cost will increase over a > period of time as more logic gets added. Any data on microbenchmarks
IMO, overhead may not increase for a _non-user_ of the feature.
> like lmbench.
I think we have run those, but I could not find the results in the mailing list. > > > <snip> > > > > > > Not at all. If the container they are interested in is guaranteed, I do > > > > not see how apps running outside a container would affect them. > > > > > > > > > > Because the kernel (outside the container subsystem) doesn't know of > > > > The core resource subsystem (VM subsystem for memory) would know about > > the guarantees and don't cares, and it would handle it appropriately. > > > > ...meaning hooks in the generic kernel reclaim algorithm. Getting > something like that in mainline will be at best tricky.
Yes, it does mean doing something in the reclamation path.
> > > -rohit > --
---------------------------------------------------------------------- Chandra Seetharaman | Be careful what you choose.... - sekharan@us.ibm.com | .......you may get it. ----------------------------------------------------------------------
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