linux-kernel - Re: [PATCH] rcu/kvfree: Add kvfree_rcu

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Message-ID: <Zqu-ZTpksvqxFt0l@pc636>
Date: Thu, 1 Aug 2024 18:57:09 +0200
From: Uladzislau Rezki <urezki@...il.com>
To: Vlastimil Babka <vbabka@...e.cz>
Cc: "Uladzislau Rezki (Sony)" <urezki@...il.com>,
	"Paul E . McKenney" <paulmck@...nel.org>, RCU <rcu@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Neeraj upadhyay <Neeraj.Upadhyay@....com>,
	Boqun Feng <boqun.feng@...il.com>,
	Joel Fernandes <joel@...lfernandes.org>,
	Frederic Weisbecker <frederic@...nel.org>,
	Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>
Subject: Re: [PATCH] rcu/kvfree: Add kvfree_rcu_barrier() API

On Thu, Aug 01, 2024 at 04:28:18PM +0200, Vlastimil Babka wrote:
> On 8/1/24 13:10, Uladzislau Rezki (Sony) wrote:
> > Add a kvfree_rcu_barrier() function. It waits until all
> > in-flight pointers are freed over RCU machinery. It does
> > not wait any GP completion and it is within its right to
> > return immediately if there are no outstanding pointers.
> > 
> > This function is useful when there is a need to guarantee
> > that a memory is fully freed before destroying memory caches.
> > For example, during unloading a kernel module.
> > 
> > Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> 
> Thanks a lot, Ulad! Locally it makde the kunit test stop failing and for now
> I've pushed it as part of my series for bots to test:
> 
> https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/linux.git/log/?h=slab-kfree_rcu-destroy-v2r0
> 
> I hope after RCU folks review I can carry this in my series and later the
> slab git tree so we don't have inter-tree dependencies. Thanks!
> 
You are welcome :)

Yep, if we need to update it i will send out a new version!

--
Uladzislau Rezki