Re: [PATCH v3 09/11] memcg: add cgroupfs interface to memcg dirtylimits

[Daisuke Nishimura]

On Mon, 18 Oct 2010 17:39:42 -0700
Greg Thelen <gthelen@xxxxxxxxxx> 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@xxxxxxxxxxx>
> Signed-off-by: Balbir Singh <balbir@xxxxxxxxxxxxxxxxxx>
> Signed-off-by: Greg Thelen <gthelen@xxxxxxxxxx>

Acked-by: Daisuke Nishimura <nishimura@xxxxxxxxxxxxxxxxx>

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.


Thanks,
Daisuke Nishimura.
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