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

[Johannes Weiner]

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
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/