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Date: Fri, 22 Mar 2019 12:59:26 -0700 From: Matthew Wilcox <willy@...radead.org> To: Christopher Lameter <cl@...ux.com> Cc: Waiman Long <longman@...hat.com>, Oleg Nesterov <oleg@...hat.com>, Andrew Morton <akpm@...ux-foundation.org>, Pekka Enberg <penberg@...nel.org>, David Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, selinux@...r.kernel.org, Paul Moore <paul@...l-moore.com>, Stephen Smalley <sds@...ho.nsa.gov>, Eric Paris <eparis@...isplace.org>, "Peter Zijlstra (Intel)" <peterz@...radead.org> Subject: Re: [PATCH 2/4] signal: Make flush_sigqueue() use free_q to release memory 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.
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