Date: Sat, 9 Jun 2012 02:32:41 +0300
From: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
To: Al Viro <viro@ZenIV.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: [RFC, PATCH, RESEND] fs: push rcu_barrier() from
 deactivate_locked_super() to filesystems
Message-ID: <20120608233240.GC18981@otc-wbsnb-06>
References: <1339191663-17693-1-git-send-email-kirill.shutemov@linux.intel.com>
 <20120608150253.e42464a6.akpm@linux-foundation.org>
 <20120608221446.GA18250@otc-wbsnb-06>
 <20120608152550.258d6a30.akpm@linux-foundation.org>
 <20120608222734.GT30000@ZenIV.linux.org.uk>
 <20120608153120.b722d7c3.akpm@linux-foundation.org>
 <20120608223624.GU30000@ZenIV.linux.org.uk>
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On Fri, Jun 08, 2012 at 11:36:24PM +0100, Al Viro wrote:
> On Fri, Jun 08, 2012 at 03:31:20PM -0700, Andrew Morton wrote:
> > On Fri, 8 Jun 2012 23:27:34 +0100
> > Al Viro <viro@ZenIV.linux.org.uk> wrote:
> >=20
> > > On Fri, Jun 08, 2012 at 03:25:50PM -0700, Andrew Morton wrote:
> > >=20
> > > > A neater implementation might be to add a kmem_cache* argument to
> > > > unregister_filesystem().  If that is non-NULL, unregister_filesyste=
m()
> > > > does the rcu_barrier() and destroys the cache.  That way we get to
> > > > delete (rather than add) a bunch of code from all filesystems and n=
ew
> > > > and out-of-tree filesystems cannot forget to perform the rcu_barrie=
r().
> > >=20
> > > There's often enough more than one cache, so that one is no-go.
> >=20
> > kmem_cache** ;)
> >=20
> > Which filesystems have multiple inode caches?
>=20
> inodes are not the only things that get caches of their own...
>=20
> BTW, Kirill, would you mind not cross-posting to that many lists ever aga=
in?

Sorry for that. I haven't deal with patches that potentially affect so
many people before.

--=20
 Kirill A. Shutemov

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