Re: [-mm][PATCH 3/4] cgroup mm owner callback changes to add task info (v5)

Andrew Morton
2008-05-22T04:21:39Z

On Wed, 21 May 2008 20:59:59 +0530 Balbir Singh <balbir@linux.vnet.ibm.com> wrote:

>
> This patch adds an additional field to the mm_owner callbacks. This field
> is required to get to the mm that changed. Hold mmap_sem in write mode
> before calling the mm_owner_changed callback
>
> ...
>
> + * The callbacks are invoked with mmap_sem held in read mode.

Is that true?

> + down_write(&mm->mmap_sem);
> ...
> cgroup_mm_owner_callbacks(mm->owner, c);

Looks like write-mode to me?