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Message-ID: <20200622190406.GA3787@pc636>
Date: Mon, 22 Jun 2020 21:04:06 +0200
From: Uladzislau Rezki <urezki@...il.com>
To: "Paul E. McKenney" <paulmck@...nel.org>, linux-mm@...ck.org
Cc: Uladzislau Rezki <urezki@...il.com>,
Matthew Wilcox <willy@...radead.org>,
LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org,
Andrew Morton <akpm@...ux-foundation.org>,
"Theodore Y . Ts'o" <tytso@....edu>,
Joel Fernandes <joel@...lfernandes.org>,
RCU <rcu@...r.kernel.org>,
Oleksiy Avramchenko <oleksiy.avramchenko@...ymobile.com>
Subject: Re: [PATCH v2 09/16] rcu/tree: Maintain separate array for vmalloc
ptrs
> > >
> > > Very good. When does kfree_rcu() and friends move out of kernel/rcu?
> > >
> > Do you mean to move the whole logic of kfree_rcu() from top to down to mm/?
>
> I do mean exactly that.
>
> That was my goal some years back when Rao Shoaib was making the first
> attempt along these lines, and it remains my goal. After all, if this
> effort is at all successful, the coupling between kfree_rcu() with
> slab/slob/slub will become much tighter than that between kfree_rcu()
> and RCU.
>
> There will need to be some additional RCU APIs used by kfree_rcu(),
> for example, something to tell RCU how many blocks are awaiting a
> grace period. But these are narrow and easily defined APIs.
>
I also think that k[v]free_rcu() should reside somewhere under "mm/".
Currently they are defined as macros under "linux/rcupdate.h". So i
am not sure if definitions should stay there or moved also.
Implementation of the k[v]free_rcu() is under rcu/tree.c and for tiny
variant is under rcutiny.h. It can be moved to the mm/slab_common.c
or independent files can be created. I think, mm people should consult
what is the best way to go :)
Any thoughts on it?
Thank you!
--
Vlad Rezki
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