From: Srivatsa Vaddagiri <vatsa@in.ibm.com>
To: Gautham R Shenoy <ego@in.ibm.com>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
Oleg Nesterov <oleg@tv-sign.ru>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Anton Blanchard <anton@samba.org>, Andrew Morton <akpm@osdl.org>,
Pavel Machek <pavel@ucw.cz>, LKML <linux-kernel@vger.kernel.org>,
Aneesh Kumar <aneesh.kumar@gmail.com>
Subject: Re: [PATCH] kthread_should_stop_check_freeze (was: Re: [PATCH -mm 3/7] Freezer: Remove PF_NOFREEZE from rcutorture thread)
Date: Tue, 13 Mar 2007 11:12:41 +0530 [thread overview]
Message-ID: <20070313054241.GB19071@in.ibm.com> (raw)
In-Reply-To: <20070313052716.GA11982@in.ibm.com>
On Tue, Mar 13, 2007 at 10:57:16AM +0530, Gautham R Shenoy wrote:
> CPU_DEAD:
> thaw_process(p);
> kthread_stop(p);
> p = NULL;
This neednt guarantee that the thread will see the stop request before
it exits the kthread_should_stop_freeze() function. There will always
be races .. So the only safe way for a thread to know whether it is time
to exit is:
while (!kthread_should_stop_freeze()) {
if (!cpu_online(home_cpu))
goto wait_to_die;
...
}
wait_to_die:
while (!kthread_should_stop()) {
/* sleep */
}
--
Regards,
vatsa
next prev parent reply other threads:[~2007-03-13 5:35 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
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 [this message]
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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