linux-kernel - Re: [BUG]: Crash with CONFIG_FAIR_CGROUP

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Message-ID: <b647ffbd0711090259u7f2f2f64qe8b6330e55d4b99f@mail.gmail.com>
Date:	Fri, 9 Nov 2007 11:59:15 +0100
From:	"Dmitry Adamushko" <dmitry.adamushko@...il.com>
To:	vatsa@...ux.vnet.ibm.com
Cc:	sukadev@...ibm.com, balbir@...ibm.com,
	Containers <containers@...ts.osdl.org>,
	ckrm-tech@...ts.sourceforge.net, linux-kernel@...r.kernel.org,
	dhaval@...ux.vnet.ibm.com, "Ingo Molnar" <mingo@...e.hu>,
	efault@....de
Subject: Re: [BUG]: Crash with CONFIG_FAIR_CGROUP_SCHED=y

On 09/11/2007, Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com> wrote:
> [ ... ]
>
>   As a solution to this problem, I moved sched_fork() call, which
>   initializes scheduler related fields on a new task, before
>   copy_namespaces(). I am not sure though whether moving up will
>   cause other side-effects. Do you see any issue?

Should be ok (IMHO and at first glance :-)

> - The second problem exposed by this test is that task_new_fair()
>   assumes that parent and child will be part of the same group (which
>   needn't be as this test shows). As a result, cfs_rq->curr can be NULL
>   for the child.

Would it be better, logically-wise, to use is_same_group() instead?
Although, we can't have 2 groups with cfs_rq->curr != NULL on the same
CPU... so if the child belongs to another group, it's cfs_rq->curr is
automatically NULL indeed.



-- 
Best regards,
Dmitry Adamushko
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