linux-kernel - Re: [PATCH 0/4] Was: deferring _

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Message-ID: <20120629083311.GX14083@ZenIV.linux.org.uk>
Date:	Fri, 29 Jun 2012 09:33:11 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	". James Morris" <jmorris@...ei.org>,
	linux-security-module@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	David Howells <dhowells@...hat.com>
Subject: Re: [PATCH 0/4] Was: deferring __fput()

On Fri, Jun 29, 2012 at 01:30:38AM -0400, Mimi Zohar wrote:
> On Thu, 2012-06-28 at 05:38 +0100, Al Viro wrote:
> > On Wed, Jun 27, 2012 at 08:37:21PM +0200, Oleg Nesterov wrote:
> > > On 06/25, Oleg Nesterov wrote:
> > > >
> > > > And if it always takes ->pi_lock we do not need the new PF_ or something
> > > > else, exit_task_work() can set task->task_works = NO_MORE under ->pi_lock
> > > > (task_work_run() can check PF_EXITING), and task_work_add() ensures that
> > > > task_works != NO_MORE.
> > > >
> > > > What do you think?
> > > 
> > > It is not clear to me if you agree or not. So I am simply sending the
> > > patches I have.
> > > 
> > > Feel free to ignore or re-do.
> > > 
> > > Seriously, why should we add 2 pointers into task_struct? Sure, this
> > > is minor, but still... But perhaps task_work.c should not play tricks
> > > with the circular list, task_work_run() can reverse the list as you
> > > initially suggested.
> > > 
> > > Also, I am not sure about "define rcu_head callback_head", this series
> > > doesn't do this. But again, up to you.
> > 
> > Umm...  FWIW, my variant circa yesterday is in vfs.git#untested; it seems to survive
> > on uml/amd64 at least.  I'll look through your patches and see what can be nicked.
> > The list removal logics in mine looks really ugly ;-/
> 
> Still failing to boot.  Fails to boot starting with commit "b24dfa6
> switch fput to task_work_add".

Details, please...  .config, root fs type, etc.  Failed execve() of init is, unfortunately,
not too informative...
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