linux-kernel - Re: [patch] rcu: rcutorture suspend fix

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Message-ID: <20061222022544.GD4451@linux.vnet.ibm.com>
Date:	Thu, 21 Dec 2006 18:25:44 -0800
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Linus Torvalds <torvalds@...l.org>,
	"Paul E. McKenney" <paulmck@...ibm.com>,
	Andrew Morton <akpm@...l.org>, linux-kernel@...r.kernel.org
Subject: Re: [patch] rcu: rcutorture suspend fix

On Fri, Dec 22, 2006 at 01:08:13AM +0100, Ingo Molnar wrote:
> Subject: [patch] rcu: rcutorture suspend fix
> From: Ingo Molnar <mingo@...e.hu>
> 
> fix suspend hang: rcutorture threads need to be nofreeze.

Looks straightforward enough -- I take it that rcutorture continues
upon resume?  So I have to ask...  Would it make sense to simply unload
the rcutorture module upon suspend?

But either way this is an improvement, so...

Acked-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> Signed-off-by: Ingo Molnar <mingo@...e.hu>
> ---
>  kernel/rcutorture.c |    3 +++
>  1 file changed, 3 insertions(+)
> 
> Index: linux/kernel/rcutorture.c
> ===================================================================
> --- linux.orig/kernel/rcutorture.c
> +++ linux/kernel/rcutorture.c
> @@ -522,6 +522,7 @@ rcu_torture_writer(void *arg)
> 
>  	VERBOSE_PRINTK_STRING("rcu_torture_writer task started");
>  	set_user_nice(current, 19);
> +	current->flags |= PF_NOFREEZE;
> 
>  	do {
>  		schedule_timeout_uninterruptible(1);
> @@ -561,6 +562,7 @@ rcu_torture_fakewriter(void *arg)
> 
>  	VERBOSE_PRINTK_STRING("rcu_torture_fakewriter task started");
>  	set_user_nice(current, 19);
> +	current->flags |= PF_NOFREEZE;
> 
>  	do {
>  		schedule_timeout_uninterruptible(1 + rcu_random(&rand)%10);
> @@ -591,6 +593,7 @@ rcu_torture_reader(void *arg)
> 
>  	VERBOSE_PRINTK_STRING("rcu_torture_reader task started");
>  	set_user_nice(current, 19);
> +	current->flags |= PF_NOFREEZE;
> 
>  	do {
>  		idx = cur_ops->readlock();
-
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