From: Tejun Heo <tj@kernel.org>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: Kernel development list <linux-kernel@vger.kernel.org>,
Eric Biederman <ebiederm@xmission.com>,
Greg Kroah-Hartman <gregkh@suse.de>,
Kay Sievers <kay.sievers@vrfy.org>
Subject: Re: Sysfs attributes racing with unregistration
Date: Wed, 4 Jan 2012 10:20:41 -0800 [thread overview]
Message-ID: <20120104182041.GO31746@google.com> (raw)
In-Reply-To: <Pine.LNX.4.44L0.1201041300130.1505-100000@iolanthe.rowland.org>
Hello,
On Wed, Jan 04, 2012 at 01:13:41PM -0500, Alan Stern wrote:
> Now, looking through the code, I wonder why sysfs_{get,put}_active()
> and sysfs_deactivate() don't use a real rwsem. Why go to all the
> effort of imitating one? Is it just to save space?
Hmmm... maybe there was something which prevented that or maybe I was
just being stupid. I don't really remember. Space is a fairly
important consideration too. Depending on configuration, there can be
a LOT of sysfs_dirents and memory consumption from sysfs has been a
real problem.
Thanks.
--
tejun
prev parent reply other threads:[~2012-01-04 18:20 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-01-04 16:52 Sysfs attributes racing with unregistration Alan Stern
2012-01-04 17:18 ` Tejun Heo
2012-01-04 18:13 ` Eric W. Biederman
2012-01-04 19:41 ` Alan Stern
2012-01-05 3:07 ` Eric W. Biederman
2012-01-05 15:13 ` Revoking filesystems [was Re: Sysfs attributes racing with unregistration] Alan Stern
2012-01-05 15:32 ` Tejun Heo
2012-01-05 16:03 ` Eric W. Biederman
2012-01-05 16:44 ` Tejun Heo
2012-01-05 16:47 ` Alan Stern
2012-01-05 17:11 ` Tejun Heo
2012-01-05 18:27 ` Ted Ts'o
2012-01-05 18:36 ` Tejun Heo
2012-01-05 19:28 ` Ted Ts'o
2012-01-05 20:52 ` Tejun Heo
2012-01-06 6:25 ` Alexander E. Patrakov
2012-01-07 21:01 ` Revoking filesystems [was Re: Sysfs attributes racing withunregistration] Milton Miller
2012-01-05 20:43 ` Revoking filesystems [was Re: Sysfs attributes racing with unregistration] Eric W. Biederman
2012-01-05 20:55 ` Tejun Heo
2012-01-05 18:38 ` Christoph Hellwig
2012-01-05 15:52 ` Eric W. Biederman
2013-01-14 15:11 ` watchdog code anish kumar
2012-01-05 18:18 ` Revoking filesystems [was Re: Sysfs attributes racing with unregistration] Greg KH
2012-01-04 18:13 ` Sysfs attributes racing with unregistration Alan Stern
2012-01-04 18:20 ` Tejun Heo [this message]
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