linux-kernel - Re: deferring _

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Message-ID: <20120623213317.GM14083@ZenIV.linux.org.uk>
Date:	Sat, 23 Jun 2012 22:33:17 +0100
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	". James Morris" <jmorris@...ei.org>,
	linux-security-module@...r.kernel.org,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	David Miller <davem@...emloft.net>
Subject: Re: deferring __fput()

On Sat, Jun 23, 2012 at 09:57:55PM +0100, Al Viro wrote:

> 3) at that point task_work is equal in size (and layout, BTW) to rcu_head.  So we can add it
> into the same union in struct file where we already have list_head and rcu_head.  No space
> eaten up.  fput() would, once the counter reaches 0, remove the file from list (the only
> place walking that list skips the ones with zero refcount anyway) and, if we are in a normal
> process, use task_work_add() to have __fput() done to it.  If we are in kernel thread or
> atomic context, just move the sucker to global list and use schedule_work() to have said

Only that's probably s/atomic/interrupt/

> list emptied and everything in it fed to __fput().
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