Re: [PATCH] slub: fix slub segmentation

Christoph Lameter (Ampere)
2024-04-04T19:18:47Z

On Tue, 2 Apr 2024, Ming Yang wrote:

> The key point of above allocation flow is: the slab should be alloced
> from the partial of other node first, instead of the buddy system of
> other node directly.

If you use GFP_THISNODE then you will trigger a reclaim pass on the remote
node. That could generate a performance regression.

We already support this kind of behavior via the node_reclaim /
zone_reclaiom setting in procfs. Please use that.

The remote buildup of the partial pages can be addressed by changing the
remote_node_defrag_ratio in the slabs. This will make slub scan remote
nodes for partial slabs before going into the page allocator.