On Fri, 22 Mar 2019, Matthew Wilcox wrote: > On Fri, Mar 22, 2019 at 07:39:31PM +0000, Christopher Lameter wrote: > > On Fri, 22 Mar 2019, Waiman Long wrote: > > > > > > > > > >> I am looking forward to it. > > > > There is also alrady rcu being used in these paths. kfree_rcu() would not > > > > be enough? It is an estalished mechanism that is mature and well > > > > understood. > > > > > > > In this case, the memory objects are from kmem caches, so they can't > > > freed using kfree_rcu(). > > > > Oh they can. kfree() can free memory from any slab cache. > > Only for SLAB and SLUB. SLOB requires that you pass a pointer to the > slab cache; it has no way to look up the slab cache from the object. Well then we could either fix SLOB to conform to the others or add a kmem_cache_free_rcu() variant.
