On Mon, Mar 01, 2010 at 05:05:35PM +0900, Daisuke Nishimura wrote:
> On Fri, 26 Feb 2010 23:52:30 +0100, Andrea Righi <arighi@xxxxxxxxxxx> wrote:
> > Infrastructure to account dirty pages per cgroup and add dirty limit
> > interfaces in the cgroupfs:
> >
> > - Active write-out: memory.dirty_ratio, memory.dirty_bytes
> > - Background write-out: memory.dirty_background_ratio, memory.dirty_background_bytes
> >
> It looks good for me in general.
>
> > Signed-off-by: Andrea Righi <arighi@xxxxxxxxxxx>
> > ---
> > include/linux/memcontrol.h | 74 +++++++++-
> > mm/memcontrol.c | 354 ++++++++++++++++++++++++++++++++++++++++----
> > 2 files changed, 399 insertions(+), 29 deletions(-)
> >
>
> (snip)
>
> > +s64 mem_cgroup_page_stat(enum mem_cgroup_page_stat_item item)
> > +{
> > + struct mem_cgroup_page_stat stat = {};
> > + struct mem_cgroup *memcg;
> > +
> I think it would be better to add "if (mem_cgroup_disabled())".
Agreed.
>
> > + rcu_read_lock();
> > + memcg = mem_cgroup_from_task(current);
> > + if (memcg) {
> > + /*
> > + * Recursively evaulate page statistics against all cgroup
> > + * under hierarchy tree
> > + */
> > + stat.item = item;
> > + mem_cgroup_walk_tree(memcg, &stat, mem_cgroup_page_stat_cb);
> > + } else
> > + stat.value = -ENOMEM;
> > + rcu_read_unlock();
> > +
> > + return stat.value;
> > +}
> > +
> > static int mem_cgroup_count_children_cb(struct mem_cgroup *mem, void *data)
> > {
> > int *val = data;
> > @@ -1263,10 +1419,10 @@ static void record_last_oom(struct mem_cgroup *mem)
> > }
> >
> > /*
> > - * Currently used to update mapped file statistics, but the routine can be
> > - * generalized to update other statistics as well.
> > + * Generalized routine to update memory cgroup statistics.
> > */
> > -void mem_cgroup_update_file_mapped(struct page *page, int val)
> > +void mem_cgroup_update_stat(struct page *page,
> > + enum mem_cgroup_stat_index idx, int val)
> > {
> > struct mem_cgroup *mem;
> > struct page_cgroup *pc;
> ditto.
Agreed.
Thanks,
-Andrea
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