[PATCH v9 03/13] memcg: add dirty page accounting infrastructure
kamezawa.hiroyu at jp.fujitsu.com
Wed Aug 17 17:39:59 PDT 2011
On Wed, 17 Aug 2011 09:14:55 -0700
Greg Thelen <gthelen at google.com> 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
> Signed-off-by: Greg Thelen <gthelen at google.com>
> Signed-off-by: Andrea Righi <andrea at betterlinux.com>
Acked-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu at jp.fujitsu.com>
> +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();
without preempt_disable/enable will work. CPU change between dec/inc will
not be problem.
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