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())".
> + 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.
> @@ -1286,7 +1442,8 @@ void mem_cgroup_update_file_mapped(struct page *page, int val)
> /*
> * Preemption is already disabled. We can use __this_cpu_xxx
> */
> - __this_cpu_add(mem->stat->count[MEM_CGROUP_STAT_FILE_MAPPED], val);
> + VM_BUG_ON(idx >= MEM_CGROUP_STAT_NSTATS);
> + __this_cpu_add(mem->stat->count[idx], val);
>
> done:
> unlock_page_cgroup(pc);
Thanks,
Daisuke Nishimura.
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