linux-kernel - Re: [patch 128/197] freezer: add try_to

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Message-ID: <4641B92D.1030909@s5r6.in-berlin.de>
Date:	Wed, 09 May 2007 14:06:05 +0200
From:	Stefan Richter <stefanr@...6.in-berlin.de>
To:	Pavel Machek <pavel@....cz>
CC:	akpm@...ux-foundation.org, torvalds@...ux-foundation.org,
	rjw@...k.pl, James.Bottomley@...elEye.com, aneesh.kumar@...il.com,
	drzeus@...eus.cx, dwmw2@...radead.org, ego@...ibm.com,
	greg@...ah.com, mingo@...e.hu, neilb@...e.de, oleg@...sign.ru,
	paulmck@...ux.vnet.ibm.com, vatsa@...ibm.com,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 128/197] freezer: add try_to_freeze calls to all kernel
 threads

Pavel Machek wrote:
>> > Add try_to_freeze() calls to the remaining kernel threads that do not call
>> > try_to_freeze() already, although they set PF_NOFREEZE.
>> > 
>> > In the future we are going to replace PF_NOFREEZE with a set of flags that
>> > will be set to indicate in which situations the task should not be frozen (for
>> > example, there can be a task that should be frozen for the CPU hotplugging and
>> > should not be frozen for the system suspend).
[...]
>> Why add no-op-try_to_freeze() everywhere now, instead of adding it later
>> when it will actually be needed?  (I.e. "in the future".)
> 
> It is needed later in the patch series... for kprobes, etc.

So does freezer_exempt() still do what its name says, or does it
freezer_exempt_but_not_always() now?
-- 
Stefan Richter
-=====-=-=== -=-= -=--=
http://arcgraph.de/sr/
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