Re: [RFC][PATCH v7 13/14] writeback: make background writebackcgroup aware

[KAMEZAWA Hiroyuki]

On Fri, 13 May 2011 01:47:52 -0700
Greg Thelen <gthelen@xxxxxxxxxx> wrote:

> When the system is under background dirty memory threshold but a cgroup
> is over its background dirty memory threshold, then only writeback
> inodes associated with the over-limit cgroup(s).
> 
> In addition to checking if the system dirty memory usage is over the
> system background threshold, over_bground_thresh() also checks if any
> cgroups are over their respective background dirty memory thresholds.
> The writeback_control.for_cgroup field is set to distinguish between a
> system and memcg overage.
> 
> If performing cgroup writeback, move_expired_inodes() skips inodes that
> do not contribute dirty pages to the cgroup being written back.
> 
> After writing some pages, wb_writeback() will call
> mem_cgroup_writeback_done() to update the set of over-bg-limits memcg.
> 
> Signed-off-by: Greg Thelen <gthelen@xxxxxxxxxx>

Seems ok to me, at least..
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>


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