1. 20 10月, 2008 1 次提交
    • K
      memcg: allocate all page_cgroup at boot · 52d4b9ac
      KAMEZAWA Hiroyuki 提交于
      Allocate all page_cgroup at boot and remove page_cgroup poitner from
      struct page.  This patch adds an interface as
      
       struct page_cgroup *lookup_page_cgroup(struct page*)
      
      All FLATMEM/DISCONTIGMEM/SPARSEMEM  and MEMORY_HOTPLUG is supported.
      
      Remove page_cgroup pointer reduces the amount of memory by
       - 4 bytes per PAGE_SIZE.
       - 8 bytes per PAGE_SIZE
      if memory controller is disabled. (even if configured.)
      
      On usual 8GB x86-32 server, this saves 8MB of NORMAL_ZONE memory.
      On my x86-64 server with 48GB of memory, this saves 96MB of memory.
      I think this reduction makes sense.
      
      By pre-allocation, kmalloc/kfree in charge/uncharge are removed.
      This means
        - we're not necessary to be afraid of kmalloc faiulre.
          (this can happen because of gfp_mask type.)
        - we can avoid calling kmalloc/kfree.
        - we can avoid allocating tons of small objects which can be fragmented.
        - we can know what amount of memory will be used for this extra-lru handling.
      
      I added printk message as
      
      	"allocated %ld bytes of page_cgroup"
              "please try cgroup_disable=memory option if you don't want"
      
      maybe enough informative for users.
      Signed-off-by: NKAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
      Reviewed-by: NBalbir Singh <balbir@linux.vnet.ibm.com>
      Cc: Daisuke Nishimura <nishimura@mxp.nes.nec.co.jp>
      Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
      Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
      52d4b9ac
新手
引导
客服 返回
顶部