Re: [PATCH v8 09/12] memcg: create support routines for writeback

[Minchan Kim]

On Fri, Jun 03, 2011 at 09:12:15AM -0700, Greg Thelen wrote:
> Introduce memcg routines to assist in per-memcg writeback:
> 
> - mem_cgroups_over_bground_dirty_thresh() determines if any cgroups need
>   writeback because they are over their dirty memory threshold.
> 
> - should_writeback_mem_cgroup_inode() determines if an inode is
>   contributing pages to an over-limit memcg.  A new writeback_control
>   field determines if shared inodes should be written back.
> 
> - mem_cgroup_writeback_done() is used periodically during writeback to
>   update memcg writeback data.
> 
> These routines make use of a new over_bground_dirty_thresh bitmap that
> indicates which mem_cgroup are over their respective dirty background
> threshold.  As this bitmap is indexed by css_id, the largest possible
> css_id value is needed to create the bitmap.  So move the definition of
> CSS_ID_MAX from cgroup.c to cgroup.h.  This allows users of css_id() to
> know the largest possible css_id value.  This knowledge can be used to
> build such per-cgroup bitmaps.
> 
> Signed-off-by: Greg Thelen <gthelen@xxxxxxxxxx>
Reviewed-by: Minchan Kim <minchan.kim@xxxxxxxxx>

-- 
Kind regards
Minchan Kim
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