)]}'
{
  "commit": "ae41be374293e70e1ed441d986afcc6e744ef9d9",
  "tree": "d8e2143820bbf3ed2f1f79ed99ee430284567b93",
  "parents": [
    "9175e0311ec9e6d1bf1f6dfecf9268baf08765e6"
  ],
  "author": {
    "name": "KAMEZAWA Hiroyuki",
    "email": "kamezawa.hiroyu@jp.fujitsu.com",
    "time": "Thu Feb 07 00:14:10 2008 -0800"
  },
  "committer": {
    "name": "Linus Torvalds",
    "email": "torvalds@woody.linux-foundation.org",
    "time": "Thu Feb 07 08:42:19 2008 -0800"
  },
  "message": "bugfix for memory cgroup controller: migration under memory controller fix\n\nWhile using memory control cgroup, page-migration under it works as following.\n\u003d\u003d\n 1. uncharge all refs at try to unmap.\n 2. charge regs again remove_migration_ptes()\n\u003d\u003d\nThis is simple but has following problems.\n\u003d\u003d\n The page is uncharged and charged back again if *mapped*.\n    - This means that cgroup before migration can be different from one after\n      migration\n    - If page is not mapped but charged as page cache, charge is just ignored\n      (because not mapped, it will not be uncharged before migration)\n      This is memory leak.\n\u003d\u003d\nThis patch tries to keep memory cgroup at page migration by increasing\none refcnt during it. 3 functions are added.\n\n mem_cgroup_prepare_migration() --- increase refcnt of page-\u003epage_cgroup\n mem_cgroup_end_migration()     --- decrease refcnt of page-\u003epage_cgroup\n mem_cgroup_page_migration() --- copy page-\u003epage_cgroup from old page to\n                                 new page.\n\nDuring migration\n  - old page is under PG_locked.\n  - new page is under PG_locked, too.\n  - both old page and new page is not on LRU.\n\nThese 3 facts guarantee that page_cgroup() migration has no race.\n\nTested and worked well in x86_64/fake-NUMA box.\n\nSigned-off-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Balbir Singh \u003cbalbir@linux.vnet.ibm.com\u003e\nCc: Pavel Emelianov \u003cxemul@openvz.org\u003e\nCc: Paul Menage \u003cmenage@google.com\u003e\nCc: Peter Zijlstra \u003ca.p.zijlstra@chello.nl\u003e\nCc: \"Eric W. Biederman\" \u003cebiederm@xmission.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Kirill Korotaev \u003cdev@sw.ru\u003e\nCc: Herbert Poetzl \u003cherbert@13thfloor.at\u003e\nCc: David Rientjes \u003crientjes@google.com\u003e\nCc: Vaidyanathan Srinivasan \u003csvaidy@linux.vnet.ibm.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "42536c737d9c412be88aac0d3959f17e0622ff05",
      "old_mode": 33188,
      "old_path": "include/linux/memcontrol.h",
      "new_id": "4ec712967f7cdd717b05074cdccfa20c7669cf0d",
      "new_mode": 33188,
      "new_path": "include/linux/memcontrol.h"
    },
    {
      "type": "modify",
      "old_id": "3270ce7375dbf03d5837c74f5aa74f3a32d9bf67",
      "old_mode": 33188,
      "old_path": "mm/memcontrol.c",
      "new_id": "128f45c16fa6626ac33813fdaefc239c18e9967f",
      "new_mode": 33188,
      "new_path": "mm/memcontrol.c"
    },
    {
      "type": "modify",
      "old_id": "7637941446971fc9c31de48066926f944cd6f8d6",
      "old_mode": 33188,
      "old_path": "mm/migrate.c",
      "new_id": "a73504ff5ab982007b2e0355e49f0dedcac65899",
      "new_mode": 33188,
      "new_path": "mm/migrate.c"
    }
  ]
}