linux-kernel - Re: [RFC, PATCH, RESEND] fs: push rcu_barrier() from deactivate_locked

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Message-ID: <CA+55aFw1yLOYzVCWMRUERNPEKgnrOfGNGmU335H_4aqGPLwq0Q@mail.gmail.com>
Date:	Fri, 8 Jun 2012 15:27:28 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Al Viro <viro@...iv.linux.org.uk>
Cc:	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Boaz Harrosh <bharrosh@...asas.com>,
	Tao Ma <boyu.mt@...bao.com>, Nick Piggin <npiggin@...nel.dk>,
	"Dmitry V. Levin" <ldv@...linux.org>,
	v9fs-developer@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org, linux-afs@...ts.infradead.org,
	linux-btrfs@...r.kernel.org, ceph-devel@...r.kernel.org,
	linux-cifs@...r.kernel.org, samba-technical@...ts.samba.org,
	codalist@...emann.coda.cs.cmu.edu, ecryptfs@...r.kernel.org,
	osd-dev@...n-osd.org, linux-ext4@...r.kernel.org,
	fuse-devel@...ts.sourceforge.net, linux-mtd@...ts.infradead.org,
	jfs-discussion@...ts.sourceforge.net, logfs@...fs.org,
	linux-nfs@...r.kernel.org, linux-nilfs@...r.kernel.org,
	linux-ntfs-dev@...ts.sourceforge.net, ocfs2-devel@....oracle.com,
	reiserfs-devel@...r.kernel.org
Subject: Re: [RFC, PATCH, RESEND] fs: push rcu_barrier() from
 deactivate_locked_super() to filesystems

On Fri, Jun 8, 2012 at 3:23 PM, Al Viro <viro@...iv.linux.org.uk> wrote:
>
> Note that module unload is *not* a hot path - not on any even remotely sane
> use.

Actually, I think we've had distributions that basically did a "load
pretty much everything, and let God sort it out" approach to modules.
I know some people *have* actually worried about module load/unload
performance.

Whether it is "remotely sane" I'm not going to argue for, but ..

                Linus
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