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Message-ID: <cc723f590702250633i27a79a9tedd5fe670cd9e4ed@mail.gmail.com>
Date: Sun, 25 Feb 2007 20:03:07 +0530
From: "Aneesh Kumar" <aneesh.kumar@...il.com>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: "Pavel Machek" <pavel@....cz>, LKML <linux-kernel@...r.kernel.org>,
paulmck@...ux.vnet.ibm.com, ego@...ibm.com, akpm@...l.org,
mingo@...e.hu, vatsa@...ibm.com, dipankar@...ibm.com,
venkatesh.pallipadi@...el.com
Subject: Re: [RFC][PATCH 4/7] Freezer: Fix vfork problem
On 2/25/07, Rafael J. Wysocki <rjw@...k.pl> wrote:
> On Sunday, 25 February 2007 11:45, Rafael J. Wysocki wrote:
> > Hi,
> >
> > =========
> --- linux-2.6.20-mm2.orig/kernel/power/process.c 2007-02-22 23:44:04.000000000 +0100
> +++ linux-2.6.20-mm2/kernel/power/process.c 2007-02-23 22:33:11.000000000 +0100
> @@ -127,22 +127,12 @@ static unsigned int try_to_freeze_tasks(
> cancel_freezing(p);
> continue;
> }
> - if (is_user_space(p)) {
> - if (!freeze_user_space)
> - continue;
> -
> - /* Freeze the task unless there is a vfork
> - * completion pending
> - */
> - if (!p->vfork_done)
> - freeze_process(p);
> - } else {
> - if (freeze_user_space)
> - continue;
> + if (is_user_space(p) == !freeze_user_space)
> + continue;
>
How about ?
if ( ! (is_user_space(p) == freeze_user_space) )
continue;
BTW one of the concern that vatsa had was; is it ok to allow some of
the tasks to be left running ( the parent from vfork ) while
freezing. I guess we can solve this in a nice way.
in fork.c
if (clone_flags & CLONE_VFORK) {
p->vfork_done = &vfork;
p->flags |= PF_PARENT_WAKEUP_ON_FREEZE;
init_completion(&vfork);
}
and in freeze_process(struct task_struct *p)
if ( p->flags & PF_PARENT_WAKEUP_ON_FREEZE ) {
wake_up_parent();
}
now parent should be wating for these completion via
wait_for_completion_freezable(); // pavel's implementation.
-aneesh
-
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