Messages in this thread | | | Subject | Re: [ckrm-tech] [PATCH 0/5] Allow more than PAGESIZE data read in configfs | From | Chandra Seetharaman <> | Date | Wed, 11 Oct 2006 16:26:00 -0700 |
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On Wed, 2006-10-11 at 15:39 -0700, Greg KH wrote: > On Tue, Oct 10, 2006 at 06:28:51PM -0700, Joel Becker wrote: > > On Tue, Oct 10, 2006 at 05:49:59PM -0700, Matt Helsley wrote: > > > We want to be able to export a sequence of small (<< 1 page), > > > homogenous, unstructured (scalar), attributes through configfs using the > > > same file. While this is rather specific, I'd guess it would be a common > > > occurrence. > > > > Pray tell, why? "One attribute per file" is the mantra here. > > You really should think hard before you break it. Simple heuristic: > > would you have to parse the buffer? Then it's wrong. > > I agree. You are trying to use configfs for something that it is not > entended to be used for. If you want to write/read large numbers of > attrbutes like this, use your own filesystem.
I would say it is a "large attribute" not "large numbers of attributes".
> > configfs has the same "one value per file" rule that sysfs has. And > because your userspace model doesn't fit that, don't try to change > configfs here. > > What happened to your old ckrmfs? I thought you were handling all of > this in that.
We decided to use an existing infrastructure instead of having our own file system.
configfs is a perfect fit for us, except the size limitation.
BTW, it it not just CKRM/RG, Paul Menage as recently extracted the processes aggregation from cpuset to have an independent infrastructure (http://marc.theaimsgroup.com/?l=ckrm-tech&m=116006307018720&w=2), which has its own file system. I was advocating him to use configfs. But, he also has this issue/limitation.
> > thanks, > > greg k-h --
---------------------------------------------------------------------- Chandra Seetharaman | Be careful what you choose.... - sekharan@us.ibm.com | .......you may get it. ----------------------------------------------------------------------
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