On Thu, 23 Jul 2015, Jesper Dangaard Brouer wrote:

quoted

quoted

I was hoping I could define this per slub runtime.  Any chance this
would be made possible?

It's not possible to set/reset slab merge in runtime. Once merging
happens, one slab could have objects from different kmem_caches so we
can't separate it cleanly. Current best approach is to prevent merging
when creating new kmem_cache by introducing new slab flag
like as SLAB_NO_MERGE.

Yes, the best option would be a new flag (e.g. SLAB_NO_MERGE) when
creating the kmem_cache.

If this is only in order to stability artificial test loads then the
current kernel parameter is fine afaict. Such a flag has been proposed
numerous times but we never did anything about these requests.

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