Re: [PATCH v9 03/13] memcg: add dirty page accountinginfrastructure

[KAMEZAWA Hiroyuki]

On Wed, 17 Aug 2011 09:14:55 -0700
Greg Thelen <gthelen@xxxxxxxxxx> wrote:

> Add memcg routines to count dirty, writeback, and unstable_NFS pages.
> These routines are not yet used by the kernel to count such pages.  A
> later change adds kernel calls to these new routines.
> 
> As inode pages are marked dirty, if the dirtied page's cgroup differs
> from the inode's cgroup, then mark the inode shared across several
> cgroup.
> 
> Signed-off-by: Greg Thelen <gthelen@xxxxxxxxxx>
> Signed-off-by: Andrea Righi <andrea@xxxxxxxxxxxxxxx>

Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>

A nitpick..



> +static inline
> +void mem_cgroup_move_account_page_stat(struct mem_cgroup *from,
> +				       struct mem_cgroup *to,
> +				       enum mem_cgroup_stat_index idx)
> +{
> +	preempt_disable();
> +	__this_cpu_dec(from->stat->count[idx]);
> +	__this_cpu_inc(to->stat->count[idx]);
> +	preempt_enable();
> +}
> +

this_cpu_dec()
this_cpu_inc()

without preempt_disable/enable will work. CPU change between dec/inc will
not be problem.

Thanks,
-Kame



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