linux-kernel - Re: [RFC PATCH(Experimental) 1/4] freezer-cpu-hotplug core

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Message-ID: <20070216081209.GB2829@in.ibm.com>
Date:	Fri, 16 Feb 2007 13:42:09 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Oleg Nesterov <oleg@...sign.ru>
Cc:	Gautham R Shenoy <ego@...ibm.com>, akpm@...l.org,
	paulmck@...ibm.com, mingo@...e.hu, dipankar@...ibm.com,
	venkatesh.pallipadi@...el.com, linux-kernel@...r.kernel.org,
	rjw@...k.pl
Subject: Re: [RFC PATCH(Experimental) 1/4] freezer-cpu-hotplug core

On Fri, Feb 16, 2007 at 12:46:17PM +0530, Srivatsa Vaddagiri wrote:
> frozen. The only exception is cleaning up of per-cpu threads (which is
> not possible with processes frozen - if we can find a way to make that
> possible, then everything can be done in CPU_DEAD).

How abt a patch like below?


--- process.c.org	2007-02-16 13:38:39.000000000 +0530
+++ process.c	2007-02-16 13:38:59.000000000 +0530
@@ -47,7 +47,7 @@ void refrigerator(void)
 	recalc_sigpending(); /* We sent fake signal, clean it up */
 	spin_unlock_irq(&current->sighand->siglock);
 
-	while (frozen(current)) {
+	while (frozen(current) && !kthread_should_stop()) {
 		current->state = TASK_UNINTERRUPTIBLE;
 		schedule();
 	}

This should let us do kthread_stop() in CPU_DEAD itself (while processes
are frozen)? That would allow us to do everything from CPU_DEAD itself
(and not have CPU_DEAD_KILL_THREADS).


-- 
Regards,
vatsa
-
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