linux-kernel - Re: [PATCH 12/17] freezer: clean up freeze

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Message-ID: <4EB2E6E6.60107@linux.vnet.ibm.com>
Date:	Fri, 04 Nov 2011 00:39:26 +0530
From:	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>
To:	Tejun Heo <tj@...nel.org>
CC:	rjw@...k.pl, paul@...lmenage.org, linux-kernel@...r.kernel.org,
	linux-pm@...r.kernel.org, arnd@...db.de, oleg@...hat.com,
	matthltc@...ibm.com
Subject: Re: [PATCH 12/17] freezer: clean up freeze_processes() failure path

Hi,

On 11/01/2011 12:35 AM, Tejun Heo wrote:
> freeze_processes() failure path is rather messy.  Freezing is canceled
> for workqueues and tasks which aren't frozen yet but frozen tasks are
> left alone and should be thawed by the caller and of course some
> callers (xen and kexec) didn't do it.
> 
> This patch updates __thaw_task() to handle cancelation correctly and
> makes thaw_processes() call thaw_processes() on failure instead so
        ^^^^^^^^^^^^^^
You meant freeze_processes() and freeze_kernel_threads() here, right?

> that the system is fully thawed on failure.  

I really like this approach of handling freezing failures.

> Unnecessary
> thaw_processes() calls are removed from kernel/power/hibernate.c and
> user.c.
> 
Did you miss kernel/power/suspend.c?
Shouldn't we be also doing something like this:

Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@...ux.vnet.ibm.com>
---

diff --git a/kernel/power/suspend.c b/kernel/power/suspend.c
index fdd4263..57aaca5 100644
--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -110,7 +110,6 @@ static int suspend_prepare(void)
        } else
                return 0;
 
-       suspend_thaw_processes();
        usermodehelper_enable();
  Finish:
        pm_notifier_call_chain(PM_POST_SUSPEND);



--- 
Regards,
Srivatsa S. Bhat  <srivatsa.bhat@...ux.vnet.ibm.com>
Linux Technology Center,
IBM India Systems and Technology Lab

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