linux-kernel - Re: [PATCH] task_work: add a scheduling point in task_work

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Message-ID: <1345584725.5158.550.camel@edumazet-glaptop>
Date:	Tue, 21 Aug 2012 23:32:05 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Mimi Zohar <zohar@...ux.vnet.ibm.com>
Cc:	Al Viro <viro@...IV.linux.org.uk>, 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] task_work: add a scheduling point in task_work_run()

On Tue, 2012-08-21 at 16:37 -0400, Mimi Zohar wrote:

> We're here, because fput() called schedule_work() to delay the last
> fput().  The execution needs to take place before the syscall returns to
> userspace.  Need to read __schedule()...  Do you know if cond_resched()
> can guarantee that it will be executed before the return to userspace? 

Some clarifications : 

- fput() does not call schedule_work() in this case but task_work_add()

- cond_resched() wont return to userspace.


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