[PATCH v3 09/11] memcg: add cgroupfs interface to memcg dirty limits

Daisuke Nishimura nishimura at mxp.nes.nec.co.jp
Tue Oct 19 20:31:10 PDT 2010

On Mon, 18 Oct 2010 17:39:42 -0700
Greg Thelen <gthelen at google.com> wrote:

> Add cgroupfs interface to memcg dirty page limits:
>   Direct write-out is controlled with:
>   - memory.dirty_ratio
>   - memory.dirty_limit_in_bytes
>   Background write-out is controlled with:
>   - memory.dirty_background_ratio
>   - memory.dirty_background_limit_bytes
> Other memcg cgroupfs files support 'M', 'm', 'k', 'K', 'g'
> and 'G' suffixes for byte counts.  This patch provides the
> same functionality for memory.dirty_limit_in_bytes and
> memory.dirty_background_limit_bytes.
> Signed-off-by: Andrea Righi <arighi at develer.com>
> Signed-off-by: Balbir Singh <balbir at linux.vnet.ibm.com>
> Signed-off-by: Greg Thelen <gthelen at google.com>

Acked-by: Daisuke Nishimura <nishimura at mxp.nes.nec.co.jp>

One question: shouldn't we return -EINVAL when writing to dirty(_background)_limit_bytes
a bigger value than that of global one(if any) ? Or do you intentionally
set the input value without comparing it with the global value ?
But, hmm..., IMHO we should check it in __mem_cgroup_dirty_param() or something
not to allow dirty pages more than global limit.

Daisuke Nishimura.

More information about the Containers mailing list