linux-kernel - Re: [PATCH 5/7] cgroup: use restart_syscall() for retries after offline waits in cgroup_subtree_control

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Message-ID: <5371A6DB.2050908@huawei.com>
Date:	Tue, 13 May 2014 13:00:11 +0800
From:	Li Zefan <lizefan@...wei.com>
To:	Tejun Heo <tj@...nel.org>
CC:	<cgroups@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 5/7] cgroup: use restart_syscall() for retries after offline
 waits in cgroup_subtree_control_write()

Hi Tejun,

On 2014/5/10 3:32, Tejun Heo wrote:
> After waiting for a child to finish offline,
> cgroup_subtree_control_write() jumps up to retry from after the input
> parsing and active protection breaking.  This retry makes the
> scheduled locking update more difficult.

Could you explain this sentence more specific? I don't understand what
"scheduled locking update" means.

>  Let's simplify it by
> returning with restart_syscall() for retries.
> 
> Signed-off-by: Tejun Heo <tj@...nel.org>
> ---
>  kernel/cgroup.c | 18 +++++++++---------
>  1 file changed, 9 insertions(+), 9 deletions(-)

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