From: KAMEZAWA Hiroyuki Date: Wed, 29 Oct 2008 21:01:06 +0000 (-0700) Subject: memcg: update menuconfig help text X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=84ad6d70001df969d7e8569dd18d98d9550277fb;p=openwrt%2Fstaging%2Fblogic.git memcg: update menuconfig help text page_cgroup is now allocated at boot and memmap doesn't includes pointer for page_cgroup. Fix the menu help text. Reviewed-by: Balbir Singh Signed-off-by: KAMEZAWA hiroyuki Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/init/Kconfig b/init/Kconfig index 44e9208f9c78..86b00c53fade 100644 --- a/init/Kconfig +++ b/init/Kconfig @@ -401,16 +401,20 @@ config CGROUP_MEM_RES_CTLR depends on CGROUPS && RESOURCE_COUNTERS select MM_OWNER help - Provides a memory resource controller that manages both page cache and - RSS memory. + Provides a memory resource controller that manages both anonymous + memory and page cache. (See Documentation/controllers/memory.txt) Note that setting this option increases fixed memory overhead - associated with each page of memory in the system by 4/8 bytes - and also increases cache misses because struct page on many 64bit - systems will not fit into a single cache line anymore. + associated with each page of memory in the system. By this, + 20(40)bytes/PAGE_SIZE on 32(64)bit system will be occupied by memory + usage tracking struct at boot. Total amount of this is printed out + at boot. Only enable when you're ok with these trade offs and really - sure you need the memory resource controller. + sure you need the memory resource controller. Even when you enable + this, you can set "cgroup_disable=memory" at your boot option to + disable memory resource controller and you can avoid overheads. + (and lose benefits of memory resource contoller) This config option also selects MM_OWNER config option, which could in turn add some fork/exit overhead.