Better API for topology information

khale commented 4 years ago

This pull request has two components:

81caa93 fixes topology enumeration on both Intel and AMD (tested on QEMU), so that we can now actually get hwthread, physical core, and socket IDs for a Nautilus CPU. AMD is still not fully functional, but it should work on <= latest Opteron systems.
32eb02e adds a convenience API on top of this information. One can now easily get hwthread/core/socket ID of a given CPU or thread, and map functions to siblings within those units. Two tests within the shell now demonstrate this, cputopotest and threadtopotest.

The newer EPYC systems are going to require some rethought of this due to their divergence from Intel on package organization.

khale commented 4 years ago

@PeterDinda good points. Fixed in b730ff6 (see above)

PeterDinda commented 4 years ago

Would also suggest stuff like NK_ALL_FILT => NK_TOPO_ALL_FILT

Otherwise looks good to me.

khale commented 4 years ago

fixed by 63d94c7

HExSA-Lab / nautilus