From: Oleg Nesterov <oleg@redhat.com>
To: Tejun Heo <tj@kernel.org>
Cc: rjw@sisk.pl, paul@paulmenage.org, linux-kernel@vger.kernel.org,
arnd@arndb.de
Subject: Re: [PATCH 12/16] freezer: clean up freeze_processes() failure path
Date: Sun, 28 Aug 2011 20:09:01 +0200 [thread overview]
Message-ID: <20110828180901.GD27032@redhat.com> (raw)
In-Reply-To: <1313763382-12341-13-git-send-email-tj@kernel.org>
On 08/19, Tejun Heo wrote:
>
> void __thaw_task(struct task_struct *p)
> {
> unsigned long flags;
> @@ -150,11 +135,19 @@ void __thaw_task(struct task_struct *p)
> * be visible to @p as waking up implies wmb. Waking up inside
> * freezer_lock also prevents wakeups from leaking outside
> * refrigerator.
> + *
> + * If !FROZEN, @p hasn't reached refrigerator, recalc sigpending to
> + * avoid leaving dangling TIF_SIGPENDING behind.
> */
> spin_lock_irqsave(&freezer_lock, flags);
> clear_freeze_flag(p);
> - if (frozen(p))
> + if (frozen(p)) {
> wake_up_process(p);
> + } else {
> + spin_lock(&p->sighand->siglock);
> + recalc_sigpending_and_wake(p);
This was copied from cancel_, yes. but what this
recalc_sigpending_and_wake() can or should do?
It looks simply pointless. It can't clear TIF_SIGPENDING,
it can only do the unneeded/spurious wake_up(INTERRUPTIBLE).
Oleg.
next prev parent reply other threads:[~2011-08-28 18:12 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-08-19 14:16 [PATCHSET] freezer: fix various bugs and simplify implementation Tejun Heo
2011-08-19 14:16 ` [PATCH 01/16] freezer: fix current->state restoration race in refrigerator() Tejun Heo
2011-08-19 15:52 ` Oleg Nesterov
2011-08-19 16:11 ` Tejun Heo
2011-08-19 21:08 ` Rafael J. Wysocki
2011-08-20 8:13 ` Tejun Heo
2011-08-19 14:16 ` [PATCH 02/16] freezer: don't unnecessarily set PF_NOFREEZE explicitly Tejun Heo
2011-08-19 16:43 ` Gustavo Padovan
2011-08-22 15:05 ` Samuel Ortiz
2011-08-19 14:16 ` [PATCH 03/16] freezer: unexport refrigerator() and update try_to_freeze() slightly Tejun Heo
2011-08-19 14:16 ` [PATCH 04/16] freezer: implement and use kthread_freezable_should_stop() Tejun Heo
2011-08-19 20:07 ` Henrique de Moraes Holschuh
2011-08-21 19:14 ` Oleg Nesterov
2011-08-22 9:53 ` Tejun Heo
2011-08-23 15:42 ` Oleg Nesterov
2011-08-19 14:16 ` [PATCH 05/16] freezer: rename thaw_process() to __thaw_task() and simplify the implementation Tejun Heo
2011-08-19 15:37 ` Paul Menage
2011-08-24 2:28 ` Matt Helsley
2011-08-19 14:16 ` [PATCH 06/16] freezer: make exiting tasks properly unfreezable Tejun Heo
2011-08-23 15:52 ` Oleg Nesterov
2011-08-23 19:44 ` Tejun Heo
2011-08-24 14:14 ` Oleg Nesterov
2011-08-25 15:59 ` Tejun Heo
2011-08-25 16:56 ` Oleg Nesterov
2011-08-25 21:01 ` Rafael J. Wysocki
2011-08-25 21:54 ` Tejun Heo
2011-08-26 21:09 ` Rafael J. Wysocki
2011-08-27 10:35 ` Tejun Heo
2011-08-27 10:51 ` Rafael J. Wysocki
2011-08-27 11:02 ` Tejun Heo
2011-08-27 12:22 ` Rafael J. Wysocki
2011-08-25 21:52 ` Tejun Heo
2011-08-24 22:34 ` Matt Helsley
2011-08-25 15:25 ` Oleg Nesterov
2011-08-25 16:11 ` Tejun Heo
2011-08-19 14:16 ` [PATCH 07/16] freezer: don't distinguish nosig tasks on thaw Tejun Heo
2011-08-19 21:14 ` Rafael J. Wysocki
2011-08-20 8:10 ` Tejun Heo
2011-08-20 8:39 ` Rafael J. Wysocki
2011-08-19 14:16 ` [PATCH 08/16] freezer: use dedicated lock instead of task_lock() + memory barrier Tejun Heo
2011-08-28 17:51 ` Oleg Nesterov
2011-08-28 18:21 ` Oleg Nesterov
2011-08-29 7:20 ` Tejun Heo
2011-08-19 14:16 ` [PATCH 09/16] freezer: make freezing indicate freeze condition in effect Tejun Heo
2011-08-28 17:56 ` Oleg Nesterov
2011-08-29 7:31 ` Tejun Heo
2011-08-29 17:44 ` Oleg Nesterov
2011-08-19 14:16 ` [PATCH 10/16] freezer: fix set_freezable[_with_signal]() race Tejun Heo
2011-08-28 18:01 ` Oleg Nesterov
2011-08-29 7:38 ` Tejun Heo
2011-08-19 14:16 ` [PATCH 11/16] freezer: kill PF_FREEZING Tejun Heo
2011-08-19 14:16 ` [PATCH 12/16] freezer: clean up freeze_processes() failure path Tejun Heo
2011-08-28 18:09 ` Oleg Nesterov [this message]
2011-08-29 7:28 ` Tejun Heo
2011-08-29 7:40 ` Rafael J. Wysocki
2011-08-19 14:16 ` [PATCH 13/16] cgroup_freezer: prepare for removal of TIF_FREEZE Tejun Heo
2011-08-19 15:40 ` Paul Menage
2011-08-28 17:39 ` Oleg Nesterov
2011-08-29 6:30 ` Tejun Heo
2011-08-19 14:16 ` [PATCH 14/16] freezer: make freezing() test freeze conditions in effect instead " Tejun Heo
2011-08-19 15:43 ` Paul Menage
2011-08-29 15:49 ` Oleg Nesterov
2011-08-29 15:56 ` Oleg Nesterov
2011-08-29 16:30 ` Oleg Nesterov
2011-08-29 16:17 ` Oleg Nesterov
2011-08-19 14:16 ` [PATCH 15/16] freezer: remove now unused TIF_FREEZE Tejun Heo
2011-08-19 14:16 ` [PATCH 16/16] freezer: remove should_send_signal() and update frozen() Tejun Heo
2011-08-19 14:23 ` [PATCHSET] freezer: fix various bugs and simplify implementation Tejun Heo
2011-08-19 15:34 ` Paul Menage
2011-08-19 16:25 ` Tejun Heo
2011-08-24 1:10 ` Matt Helsley
2011-08-19 21:00 ` Rafael J. Wysocki
2011-08-20 8:14 ` Tejun Heo
2011-09-05 8:52 ` [BUG] CPU hotplug, freezer: Freezing of tasks failed after 20.00 seconds Srivatsa S. Bhat
2011-09-05 14:15 ` Tejun Heo
2011-09-06 5:08 ` Tejun Heo
2011-09-06 6:01 ` Rafael J. Wysocki
2011-10-02 19:13 ` Srivatsa S. Bhat
2011-10-02 19:33 ` Rafael J. Wysocki
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