On Tue, 8 Dec 2015, Jesper Dangaard Brouer wrote:
> > > > Does this support freeing objects from a set of different caches?
> > >
> > > This is for supporting memcg (CONFIG_MEMCG_KMEM).
> > >
> > > Quoting from commit 033745189b1b ("slub: add missing kmem cgroup
> > > support to kmem_cache_free_bulk"):
> > >
> > > Incoming bulk free objects can belong to different kmem cgroups, and
> > > object free call can happen at a later point outside memcg context. Thus,
> > > we need to keep the orig kmem_cache, to correctly verify if a memcg object
> > > match against its "root_cache" (s->memcg_params.root_cache).
> >
> > Where is that verification? This looks like SLAB would support freeing
> > objects from different caches.
>
> This is for supporting CONFIG_MEMCG_KMEM, thus I would like Vladimir
> input on this, as I don't know enough about memcg....
Oww... So far objects passed to bulk free must be confined to the *same*
slab cache. Not the same "root_cache". Are we changing that?
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