linux-kernel - Re: [PATCH 1/4] PM/Freezer: Make thaw_processes() thaw only userspace tasks

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Message-ID: <20120130220919.GC27616@google.com>
Date:	Mon, 30 Jan 2012 14:09:19 -0800
From:	Tejun Heo <tj@...nel.org>
To:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
Cc:	rjw@...k.pl, pavel@....cz, len.brown@...el.com,
	linux-pm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] PM/Freezer: Make thaw_processes() thaw only
 userspace tasks

On Tue, Jan 31, 2012 at 03:34:57AM +0530, Srivatsa S. Bhat wrote:
> Currently the situation is:
> 
> freeze_processes() - freezes only userspace tasks
> freeze_kernel_threads() - freezes only kernel threads
> thaw_kernel_threads() - thaws only kernel threads
> thaw_processes() - thaws *everything* (both userspace tasks and kernel threads)
> 
> The point that thaw_processes() thaws everything is rather unintuitive
> and can lead to bugs. So, modify thaw_processes() so that it thaws only
> userspace processes. This way we can also have more control over what
> exactly gets thawed in different situations.
> 
> Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>

Maybe I'm misreading it but doesn't this introduce window where kernel
tasks aren't thawed between this patch and the following ones?  It
looks like this one should come later.

Thanks.

-- 
tejun
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