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Message-ID: <ZnBnb1WkJFXs5L6z@pc636>
Date: Mon, 17 Jun 2024 18:42:23 +0200
From: Uladzislau Rezki <urezki@...il.com>
To: "Jason A. Donenfeld" <Jason@...c4.com>
Cc: Uladzislau Rezki <urezki@...il.com>,
"Paul E. McKenney" <paulmck@...nel.org>,
Vlastimil Babka <vbabka@...e.cz>, Jakub Kicinski <kuba@...nel.org>,
Julia Lawall <Julia.Lawall@...ia.fr>, linux-block@...r.kernel.org,
kernel-janitors@...r.kernel.org, bridge@...ts.linux.dev,
linux-trace-kernel@...r.kernel.org,
Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
kvm@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
"Naveen N. Rao" <naveen.n.rao@...ux.ibm.com>,
Christophe Leroy <christophe.leroy@...roup.eu>,
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ecryptfs@...r.kernel.org, Neil Brown <neilb@...e.de>,
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netfilter-devel@...r.kernel.org, coreteam@...filter.org
Subject: Re: [PATCH 00/14] replace call_rcu by kfree_rcu for simple
kmem_cache_free callback
On Mon, Jun 17, 2024 at 06:33:23PM +0200, Jason A. Donenfeld wrote:
> On Mon, Jun 17, 2024 at 6:30 PM Uladzislau Rezki <urezki@...il.com> wrote:
> > Here if an "err" is less then "0" means there are still objects
> > whereas "is_destroyed" is set to "true" which is not correlated
> > with a comment:
> >
> > "Destruction happens when no objects"
>
> The comment is just poorly written. But the logic of the code is right.
>
OK.
> >
> > > out_unlock:
> > > mutex_unlock(&slab_mutex);
> > > cpus_read_unlock();
> > > diff --git a/mm/slub.c b/mm/slub.c
> > > index 1373ac365a46..7db8fe90a323 100644
> > > --- a/mm/slub.c
> > > +++ b/mm/slub.c
> > > @@ -4510,6 +4510,8 @@ void kmem_cache_free(struct kmem_cache *s, void *x)
> > > return;
> > > trace_kmem_cache_free(_RET_IP_, x, s);
> > > slab_free(s, virt_to_slab(x), x, _RET_IP_);
> > > + if (s->is_destroyed)
> > > + kmem_cache_destroy(s);
>
Here i am not follow you. How do you see that a cache has been fully
freed? Or is it just super draft code?
Thanks!
--
Uladzislau Rezki
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