linux-kernel - Re: [PATCH -mm 3/7] Freezer: Remove PF

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Date:	Fri, 2 Mar 2007 12:27:30 +0530
From:	Gautham R Shenoy <ego@...ibm.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Andrew Morton <akpm@...l.org>, Pavel Machek <pavel@....cz>,
	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...sign.ru>,
	Aneesh Kumar <aneesh.kumar@...il.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Srivatsa Vaddagiri <vatsa@...ibm.com>
Subject: Re: [PATCH -mm 3/7] Freezer: Remove PF_NOFREEZE from rcutorture thread

> From: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> 
> Remove PF_NOFREEZE from the rcutorture thread, adding a try_to_freeze() call as
> required.
> 
> Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
> Acked-by: Pavel Machek <pavel@....cz>
> ---
>  kernel/rcutorture.c |    3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)
> 
> Index: linux-2.6.20-mm2/kernel/rcutorture.c
> ===================================================================
> --- linux-2.6.20-mm2.orig/kernel/rcutorture.c	2007-02-25 12:07:15.000000000 +0100
> +++ linux-2.6.20-mm2/kernel/rcutorture.c	2007-02-25 12:49:23.000000000 +0100
> @@ -46,6 +46,7 @@
>  #include <linux/byteorder/swabb.h>
>  #include <linux/stat.h>
>  #include <linux/srcu.h>
> +#include <linux/freezer.h>
> 
>  MODULE_LICENSE("GPL");
>  MODULE_AUTHOR("Paul E. McKenney <paulmck@...ibm.com> and "
> @@ -585,7 +586,6 @@ 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);
> @@ -607,6 +607,7 @@ rcu_torture_writer(void *arg)
>  		}
>  		rcu_torture_current_version++;
>  		oldbatch = cur_ops->completed();
> +		try_to_freeze();
>  	} while (!kthread_should_stop() && !fullstop);
>  	VERBOSE_PRINTK_STRING("rcu_torture_writer task stopping");
>  	while (!kthread_should_stop())

Paul, 
Any reasons for not try_to_freeze()'ing the fakewriter and the reader
threads?? (Ok, I admit, I haven't looked into the code for the reason
which might be obvious.)


thanks
gautham.
-- 
Gautham R Shenoy
Linux Technology Center
IBM India.
"Freedom comes with a price tag of responsibility, which is still a bargain,
because Freedom is priceless!"
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