Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop race

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To: <ego@...>

Cc: Rafael J. Wysocki <rjw@...>, Oleg Nesterov <oleg@...>, <linux-kernel@...>, <mingo@...>, <vatsa@...>, <paulmck@...>, <pavel@...>

Subject: Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop race

Date: Friday, April 20, 2007 - 1:30 pm

On Fri, 20 Apr 2007 17:56:09 +0530
Gautham R Shenoy <ego@in.ibm.com> wrote:

quoted text> > I mean, we already have four of them (PF_NOFREEZE, PF_FROZEN,
> > PF_FREEZER_SKIP, TIF_FREEZE), and you will need to introduce two more for
> > the freezer-based CPU hotplug, so if yet another one is needed, that will make
> > up almost a separate u8 field ...
> 
> I am perfectly ok with it. But I am not sure if everybody would agree to have
> another field in the task struct, though in this case it does make sense :-)

OK by me.  You might want to consider making that fields's locking protocol
be set_bit(), clear_bit(), etc rather than task_lock().
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Messages in current thread:

[RFC 0/2] Fix Freezer related races., Gautham R Shenoy, (Thu Apr 19, 8:01 am)

[RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop race, Gautham R Shenoy, (Thu Apr 19, 8:04 am)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Oleg Nesterov, (Fri Apr 20, 5:12 pm)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Gautham R Shenoy, (Mon Apr 23, 6:38 am)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Oleg Nesterov, (Mon Apr 23, 2:39 pm)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Gautham R Shenoy, (Mon Apr 23, 4:34 pm)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Andrew Morton, (Thu Apr 19, 5:31 pm)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Gautham R Shenoy, (Fri Apr 20, 6:46 am)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Pavel Machek, (Sat Apr 21, 5:37 am)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Rafael J. Wysocki, (Fri Apr 20, 4:54 am)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Gautham R Shenoy, (Fri Apr 20, 7:05 am)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Oleg Nesterov, (Fri Apr 20, 5:20 pm)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Rafael J. Wysocki, (Fri Apr 20, 5:45 pm)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Rafael J. Wysocki, (Fri Apr 20, 7:59 am)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Gautham R Shenoy, (Fri Apr 20, 8:26 am)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Andrew Morton, (Fri Apr 20, 1:30 pm)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Ingo Molnar, (Fri Apr 20, 2:31 pm)

[RFC][PATCH -mm 0/3] Separate freezer flags, Rafael J. Wysocki, (Sun Apr 22, 3:28 pm)

[RFC][PATCH -mm 1/3] Separate freezer from PM code, Rafael J. Wysocki, (Sun Apr 22, 3:33 pm)

Re: [RFC][PATCH -mm 1/3] Separate freezer from PM code, Pavel Machek, (Mon Apr 23, 6:41 am)

[RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Rafael J. Wysocki, (Sun Apr 22, 3:39 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Oleg Nesterov, (Mon Apr 23, 6:23 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Rafael J. Wysocki, (Mon Apr 23, 6:40 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Oleg Nesterov, (Mon Apr 23, 6:55 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Rafael J. Wysocki, (Mon Apr 23, 7:10 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Oleg Nesterov, (Mon Apr 23, 7:19 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Rafael J. Wysocki, (Tue Apr 24, 7:32 am)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Gautham R Shenoy, (Mon Apr 23, 6:41 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Rafael J. Wysocki, (Mon Apr 23, 6:55 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Gautham R Shenoy, (Mon Apr 23, 9:17 am)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Rafael J. Wysocki, (Mon Apr 23, 3:57 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Pavel Machek, (Mon Apr 23, 6:50 am)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Satyam Sharma, (Mon Apr 23, 12:09 am)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Rafael J. Wysocki, (Mon Apr 23, 3:06 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Gautham R Shenoy, (Mon Apr 23, 10:19 am)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Rafael J. Wysocki, (Mon Apr 23, 2:49 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Paul Jackson, (Sun Apr 22, 5:14 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Rafael J. Wysocki, (Sun Apr 22, 6:14 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Paul Jackson, (Sun Apr 22, 6:31 pm)

Re: [RFC][PATCH -mm 2/3] freezer: Introduce freezer_flags, Satyam Sharma, (Sun Apr 22, 11:18 pm)

[RFC][PATCH -mm 3/3] freezer: Fix problem with kthread_stop, Rafael J. Wysocki, (Sun Apr 22, 3:40 pm)

Re: [RFC][PATCH -mm 3/3] freezer: Fix problem with kthread_s..., Gautham R Shenoy, (Mon Apr 23, 8:35 am)

Re: [RFC][PATCH -mm 3/3] freezer: Fix problem with kthread_s..., Rafael J. Wysocki, (Mon Apr 23, 3:55 pm)

Re: [RFC][PATCH -mm 3/3] freezer: Fix problem with kthread_s..., Oleg Nesterov, (Mon Apr 23, 4:46 pm)

Re: [RFC][PATCH -mm 3/3] freezer: Fix problem with kthread_s..., Gautham R Shenoy, (Mon Apr 23, 5:16 pm)

Re: [RFC][PATCH -mm 3/3] freezer: Fix problem with kthread_s..., Rafael J. Wysocki, (Mon Apr 23, 5:30 pm)

Re: [RFC][PATCH -mm 3/3] freezer: Fix problem with kthread_s..., Oleg Nesterov, (Mon Apr 23, 3:03 pm)

Re: [RFC][PATCH -mm 3/3] freezer: Fix problem with kthread_s..., Rafael J. Wysocki, (Mon Apr 23, 4:05 pm)

Re: [RFC][PATCH -mm 3/3] freezer: Fix problem with kthread_s..., Pavel Machek, (Mon Apr 23, 6:40 am)

Re: [RFC][PATCH -mm 3/3] freezer: Fix problem with kthread_s..., Rafael J. Wysocki, (Mon Apr 23, 3:50 pm)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Rafael J. Wysocki, (Fri Apr 20, 5:13 pm)

Re: [RFC PATCH(experimental) 2/2] Fix freezer-kthread_stop r..., Rafael J. Wysocki, (Fri Apr 20, 8:50 am)

[RFC PATCH 1/2] Fix PF_NOFREEZE and freezeable race, Gautham R Shenoy, (Thu Apr 19, 8:02 am)

Re: [RFC PATCH 1/2] Fix PF_NOFREEZE and freezeable race, Rafael J. Wysocki, (Thu Apr 19, 5:39 pm)

Re: [RFC PATCH 1/2] Fix PF_NOFREEZE and freezeable race, Oleg Nesterov, (Fri Apr 20, 2:02 pm)

Re: [RFC PATCH 1/2] Fix PF_NOFREEZE and freezeable race, Gautham R Shenoy, (Mon Apr 23, 6:26 am)

Re: [RFC PATCH 1/2] Fix PF_NOFREEZE and freezeable race, Oleg Nesterov, (Mon Apr 23, 1:49 pm)

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