From: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
Cc: Anton Blanchard <anton@samba.org>, Andrew Morton <akpm@osdl.org>,
Pavel Machek <pavel@ucw.cz>, LKML <linux-kernel@vger.kernel.org>,
Oleg Nesterov <oleg@tv-sign.ru>,
Aneesh Kumar <aneesh.kumar@gmail.com>,
Srivatsa Vaddagiri <vatsa@in.ibm.com>,
Gautham R Shenoy <ego@in.ibm.com>
Subject: Re: [PATCH -mm 3/7] Freezer: Remove PF_NOFREEZE from rcutorture thread
Date: Fri, 2 Mar 2007 13:35:49 -0800 [thread overview]
Message-ID: <20070302213549.GC2373@linux.vnet.ibm.com> (raw)
In-Reply-To: <200703012054.26940.rjw@sisk.pl>
On Thu, Mar 01, 2007 at 08:54:25PM +0100, Rafael J. Wysocki wrote:
> On Thursday, 1 March 2007 20:38, Anton Blanchard wrote:
> >
> > Hi,
> >
> > > Remove PF_NOFREEZE from the rcutorture thread, adding a
> > > try_to_freeze() call as required.
> >
> > ...
> >
> > > @@ -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())
> >
> > I wonder if it makes sense to embed try_to_freeze() into the kthread
> > API somewhere. Short of that we should document the try_to_freeze()
> > requirement in the kthread documentation... Unfortunately I cant find
> > any kthread docs in Documentation/ :)
>
> Well, the patch is from Paul, so I think he'll be able to comment. :-)
We certainly either need to embed try_to_freeze() into kthread_should_stop()
or add back the rcu_torture_fakewriter(), and rcu_torture_reader()
components of this patch. ;-)
One way to embed try_to_freeze() into kthread_should_stop() might be
as follows:
int kthread_should_stop(void)
{
if (kthread_stop_info.k == current)
return 1;
try_to_freeze();
return 0;
}
Does this seem reasonable? It certainly would cut down some of the
code required for freezing -- and reduce the potential for bugs.
Thanx, Paul
next prev parent reply other threads:[~2007-03-02 21:35 UTC|newest]
Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-26 7:00 [PATCH -mm 0/6] Freezer changes Rafael J. Wysocki
2007-02-26 7:02 ` [PATCH -mm 1/6] Freezer: Read PF_BORROWED_MM in a nonracy way Rafael J. Wysocki
2007-02-26 7:05 ` [PATCH -mm 2/6] Freezer: Fix memory ordering in refrigerator Rafael J. Wysocki
2007-02-26 11:32 ` Oleg Nesterov
2007-02-26 7:06 ` [PATCH -mm 3/6] Freezer: Close theoretical race between refrigerator and thaw_tasks Rafael J. Wysocki
2007-02-26 7:08 ` [PATCH -mm 4/6] Freezer: Remove PF_NOFREEZE from rcutorture thread Rafael J. Wysocki
2007-02-26 7:11 ` [PATCH -mm 5/6] Freezer: Remove PF_NOFREEZE from bluetooth threads Rafael J. Wysocki
2007-02-26 7:13 ` [PATCH -mm 6/6] Freezer: Add try_to_freeze calls to all kernel threads Rafael J. Wysocki
2007-03-01 15:05 ` [PATCH -mm 0/7] Freezer changes (take 2) Rafael J. Wysocki
2007-03-01 15:06 ` [PATCH -mm 1/7] Freezer: Read PF_BORROWED_MM in a nonracy way Rafael J. Wysocki
2007-03-01 15:08 ` [PATCH -mm 2/7] Freezer: Close theoretical race between refrigerator and thaw_tasks Rafael J. Wysocki
2007-03-01 16:39 ` Pavel Machek
2007-03-01 15:09 ` [PATCH -mm 3/7] Freezer: Remove PF_NOFREEZE from rcutorture thread Rafael J. Wysocki
2007-03-01 19:38 ` Anton Blanchard
2007-03-01 19:54 ` Rafael J. Wysocki
2007-03-02 21:35 ` Paul E. McKenney [this message]
2007-03-02 22:16 ` Anton Blanchard
2007-03-02 23:33 ` Oleg Nesterov
2007-03-03 0:58 ` Paul E. McKenney
2007-03-03 17:32 ` Oleg Nesterov
2007-03-04 4:34 ` Srivatsa Vaddagiri
2007-03-11 17:49 ` [PATCH] kthread_should_stop_check_freeze (was: Re: [PATCH -mm 3/7] Freezer: Remove PF_NOFREEZE from rcutorture thread) Rafael J. Wysocki
2007-03-12 4:38 ` Paul E. McKenney
2007-03-12 8:14 ` Pavel Machek
2007-03-12 11:19 ` Rafael J. Wysocki
2007-03-12 12:23 ` Oleg Nesterov
2007-03-12 13:24 ` [PATCH] kthread_should_stop_check_freeze Cedric Le Goater
2007-03-12 18:25 ` Rafael J. Wysocki
2007-03-12 22:39 ` [PATCH] kthread_should_stop_check_freeze (was: Re: [PATCH -mm 3/7] Freezer: Remove PF_NOFREEZE from rcutorture thread) Pavel Machek
2007-03-12 22:45 ` Anton Blanchard
2007-03-13 3:14 ` Srivatsa Vaddagiri
2007-03-13 9:16 ` Christoph Hellwig
2007-03-13 9:58 ` Srivatsa Vaddagiri
2007-03-13 10:20 ` Christoph Hellwig
2007-03-20 18:08 ` Pavel Machek
2007-03-13 0:58 ` Paul E. McKenney
2007-03-20 18:10 ` Pavel Machek
2007-03-13 5:27 ` Gautham R Shenoy
2007-03-13 5:42 ` Srivatsa Vaddagiri
2007-03-03 1:03 ` [PATCH -mm 3/7] Freezer: Remove PF_NOFREEZE from rcutorture thread Rafael J. Wysocki
2007-03-02 6:57 ` Gautham R Shenoy
2007-03-02 21:46 ` Paul E. McKenney
2007-03-01 15:10 ` [PATCH -mm 4/7] Freezer: Remove PF_NOFREEZE from bluetooth threads Rafael J. Wysocki
2007-03-01 15:12 ` [PATCH -mm 5/7] Freezer: Add try_to_freeze calls to all kernel threads Rafael J. Wysocki
2007-03-01 15:15 ` [PATCH -mm 6/7] Freezer: Fix vfork problem Rafael J. Wysocki
2007-03-01 15:17 ` [PATCH -mm 7/7] Freezer: Take kernel_execve into consideration Rafael J. Wysocki
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