On Mon, May 20, 2019 at 03:40:14PM +1000, Tobin C. Harding wrote: > We have just implemented Slab Movable Objects (SMO). On NUMA systems > slabs can become unbalanced i.e. many slabs on one node while other > nodes have few slabs. Using SMO we can balance the slabs across all > the nodes. > > The algorithm used is as follows: > > 1. Move all objects to node 0 (this has the effect of defragmenting the > cache). This already sounds dangerous (or costly). Can't it be done without cross-node data moves? > > 2. Calculate the desired number of slabs for each node (this is done > using the approximation nr_slabs / nr_nodes). So that on this step only (actual data size - desired data size) has to be moved? Thanks!
