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From: Oleg Nesterov <oleg@redhat.com>
To: Jan Kara <jack@suse.cz>
Cc: Al Viro <viro@zeniv.linux.org.uk>,
	Dave Chinner <david@fromorbit.com>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
	Peter Zijlstra <peterz@infradead.org>,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v2 7/8] shift percpu_counter_destroy() into destroy_super_work()
Date: Thu, 13 Aug 2015 15:36:16 +0200	[thread overview]
Message-ID: <20150813133616.GC15609@redhat.com> (raw)
In-Reply-To: <20150813103518.GG26599@quack.suse.cz>

On 08/13, Jan Kara wrote:
>
> On Tue 11-08-15 19:04:16, Oleg Nesterov wrote:
> >
> > So this is just the temporary kludge which helps us to avoid the
> > conflicts with the changes which will be (hopefully) routed via
> > rcu tree.
> >
> > Signed-off-by: Oleg Nesterov <oleg@redhat.com>
>
> Looking into this again, it would seem somewhat cleaner to me to move the
> destruction to deactivate_locked_super() instead.

Heh ;) You know, I was looking at deactivate_locked_super(). However, I
simply do not understand this code enough, I failed to verify it would
be safe to destroy s_writers there.

And. Please note destroy_super() in alloc_super() error path, so this
needs a bit more changes in any case.

Can't we live with this hack for now? To remind, it will be reverted
(at least partially) in any case. Yes, yes, it is very ugly and the
changelog documents this fact. But it looks simple and safe. To me
it would be better to make the conversion first, then cleanup this
horror after another discussion.

What do you think?

Oleg.


  reply	other threads:[~2015-08-13 13:38 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-08-11 17:03 [PATCH v2 0/8] change sb_writers to use percpu_rw_semaphore Oleg Nesterov
2015-08-11 17:03 ` [PATCH v2 1/8] introduce __sb_{acquire,release}_write() helpers Oleg Nesterov
2015-08-13  9:45   ` Jan Kara
2015-08-13  9:56     ` Jan Kara
2015-08-13 13:17       ` Oleg Nesterov
2015-08-13 13:32         ` Jan Kara
2015-08-13 13:37           ` Oleg Nesterov
2015-08-11 17:04 ` [PATCH v2 2/8] fix the broken lockdep logic in __sb_start_write() Oleg Nesterov
2015-08-13 10:02   ` Jan Kara
2015-08-13 13:22     ` Oleg Nesterov
2015-08-13 13:29       ` Jan Kara
2015-08-11 17:04 ` [PATCH v2 3/8] document rwsem_release() in sb_wait_write() Oleg Nesterov
2015-08-13 10:22   ` Jan Kara
2015-08-11 17:04 ` [PATCH v2 4/8] percpu-rwsem: introduce percpu_down_read_trylock() Oleg Nesterov
2015-08-11 17:04 ` [PATCH v2 5/8] percpu-rwsem: introduce percpu_rwsem_release() and percpu_rwsem_acquire() Oleg Nesterov
2015-08-11 17:04 ` [PATCH v2 6/8] percpu-rwsem: kill CONFIG_PERCPU_RWSEM Oleg Nesterov
2015-08-11 17:04 ` [PATCH v2 7/8] shift percpu_counter_destroy() into destroy_super_work() Oleg Nesterov
2015-08-13 10:35   ` Jan Kara
2015-08-13 13:36     ` Oleg Nesterov [this message]
2015-08-13 14:09       ` Jan Kara
2015-08-13 15:20         ` Oleg Nesterov
2015-08-11 17:04 ` [PATCH v2 8/8] change sb_writers to use percpu_rw_semaphore Oleg Nesterov
2015-08-13 10:48   ` Jan Kara
2015-08-12 13:11 ` [PATCH v2 9/8] don't fool lockdep in freeze_super() and thaw_super() paths Oleg Nesterov
2015-08-13 11:01   ` Jan Kara
2015-08-13 13:58     ` Oleg Nesterov

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