Dataspace juju

[Daniel Waddington]

Hi Christian,
But this is 2GB which even rounded up to 128M is 1920MB??  The RAM
dataspace should be plenty big enough.

Daniel

On Wed, 2013-07-10 at 20:26 +0200, Christian Prochaska wrote:
> Hi Daniel,
> 
> On 10.07.2013 16:48, Daniel Waddington wrote:
> > Hi Alex,
> > I see, so there is some 2^N round up.  Why is this, I thought it used an
> > AVL tree to manage memory?
> 
> >From my understanding it's a mapping optimization for some kernels. Something like: mapping 64M to another task can be done with one
> syscall if the address has 64M alignment. But I'm not familiar with the details, perhaps somebody else can help out here?
> 
> > Also, can you run the test with..
> >
> > #define NUM_REGIONS 15
> > #define TOTAL_MEMORY_TO_USE GB(2)
> > #define REGION_SIZE MB(96)
> >
> > I then get unhandled page faults.  Can you see why?
> >
> > Thanks
> > Daniel
> >
> 
> When only changing these values, the RAM dataspace is too small (phys_slab_size = GB(1)) for 15 regions of 96M. Usually, it would be
> an error if 'Ram_session::attach()' gets called with an 'offset' which exceeds the size of the dataspace (which happens in this
> case), but if I remember correctly there was a use case where this was valid. Something with ELF images and the dynamic linker.
> @ssumpf, do you remember? We should probably document this in 'Rm_session_component::attach()', why no exception gets thrown if
> 'size' is given and (offset >= dsc()->size()).
> 
> Christian
> 
> 
> ------------------------------------------------------------------------------
> See everything from the browser to the database with AppDynamics
> Get end-to-end visibility with application monitoring from AppDynamics
> Isolate bottlenecks and diagnose root cause in seconds.
> Start your free trial of AppDynamics Pro today!
> http://pubads.g.doubleclick.net/gampad/clk?id=48808831&iu=/4140/ostg.clktrk
> _______________________________________________
> Genode-main mailing list
> Genode-main at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/genode-main