On Tuesday 02 May 2006 19:20, Serge E. Hallyn wrote:
> Quoting Andi Kleen ([email protected]):
> > On Tuesday 02 May 2006 10:03, Eric W. Biederman wrote:
> > 7 additional bits will probably not be enough. I still don't
> > quite understand why you want individual bits for everything.
> > Why not group them into logical pieces?
>
> I wouldn't be surprised if it makes sense to combine some of them. For
> instance, perhaps utsname and networking?
I frankly would just combine everything new.
>
> > Have a proxy structure which has pointers to the many name spaces and a bit
> > mask for "namespace X is different".
>
> different from what?
>From the parent.
>
> Oh, you mean in case we want to allow cloning a namespace outside of
> fork *without* cloning the nsproxy struct?
Basically every time any name space changes you need a new nsproxy.
>
> > This structure would be reference
> > counted. task_struct has a single pointer to it.
>
> If it is reference counted, that implies it is shared between some
> processes. But namespace pointers themselves are shared between some of
> these nsproxy's. The lifetime mgmt here is one reason I haven't tried a
> patch to do this.
The livetime management is no different from having individual pointers.
> > With many name spaces you would have smaller task_struct, less cache
> > foot print, better cache use of task_struct because slab cache colouring
> > will still work etc.
>
> I suppose we could run some performance tests with some dummy namespace
> pointers? 9 void *'s directly in the task struct, and the same inside a
> refcounted container struct. The results might add some urgency to
> implementing the struct nsproxy.
Not sure you'll notice too much difference on the beginning. I am just
the opinion memory/cache bloat needs to be attacked at the root, not
when it's too late.
-Andi
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