Re: [PATCH 0/4] memcg: simplify LRU handling.

Johannes Weiner
2011-12-19T15:56:20Z

On Wed, Dec 14, 2011 at 04:47:34PM +0900, KAMEZAWA Hiroyuki wrote:
>
> This series is onto linux-next +
> memcg-add-mem_cgroup_replace_page_cache-to-fix-lru-issue.patch
>
> The 1st purpose of this patch is reduce overheads of mem_cgroup_add/del_lru.
> They uses some atomic ops.

Which is noticable.

With a simple sparse file cat, mem_cgroup_lru_add_list() went from

1.12% cat [kernel.kallsyms] [k] mem_cgroup_lru_add_list

to

0.31% cat [kernel.kallsyms] [k] mem_cgroup_lru_add_list

and real time went down, too:

5 runs min median max in seconds
vanilla: 7.762 7.782 7.816
patched: 7.622 7.631 7.660