From: Pavel Machek <pavel@ucw.cz>
To: Anton Blanchard <anton@samba.org>
Cc: "Rafael J. Wysocki" <rjw@sisk.pl>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Oleg Nesterov <oleg@tv-sign.ru>, Andrew Morton <akpm@osdl.org>,
LKML <linux-kernel@vger.kernel.org>,
Aneesh Kumar <aneesh.kumar@gmail.com>,
Srivatsa Vaddagiri <vatsa@in.ibm.com>,
Gautham R Shenoy <ego@in.ibm.com>
Subject: Re: [PATCH] kthread_should_stop_check_freeze (was: Re: [PATCH -mm 3/7] Freezer: Remove PF_NOFREEZE from rcutorture thread)
Date: Tue, 20 Mar 2007 19:08:57 +0100 [thread overview]
Message-ID: <20070320180857.GC2593@elf.ucw.cz> (raw)
In-Reply-To: <20070312224524.GB807@kryten>
Hi!
> > Do not do it, then. Confusion it causes is not worth saving one line
> > of code.
> >
> > You do less typing, but the resulting code is _less_ readable, not
> > more.
>
> Then please document it _clearly_ with the kthread code somewhere. The
> reason I brought this up is I had no idea we had to put the freezer gunk
> in all kernel thread loops and Ive been writing kernel threads for years.
This is in Doc*/power/kernel_threads.txt:
KERNEL THREADS
Freezer
Upon entering a suspended state the system will freeze all
tasks. This is done by delivering pseudosignals. This affects
kernel threads, too. To successfully freeze a kernel thread
the thread has to check for the pseudosignal and enter the
refrigerator. Code to do this looks like this:
do {
hub_events();
wait_event_interruptible(khubd_wait,
!list_empty(&hub_event_list));
try_to_freeze();
} while (!signal_pending(current));
...do you know about better place?
Pavel
--
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
next prev parent reply other threads:[~2007-03-20 18:09 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 [this message]
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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