)]}'
{
  "commit": "bb21c7ce18eff8e6e7877ca1d06c6db719376e3c",
  "tree": "555edaded1e0a771df406ce2b6b63368df6de6cd",
  "parents": [
    "9e506f7adce8e6165a104d3d78fddd8ff0cdccf8"
  ],
  "author": {
    "name": "KOSAKI Motohiro",
    "email": "kosaki.motohiro@jp.fujitsu.com",
    "time": "Fri Jun 04 14:15:05 2010 -0700"
  },
  "committer": {
    "name": "Linus Torvalds",
    "email": "torvalds@linux-foundation.org",
    "time": "Fri Jun 04 15:21:45 2010 -0700"
  },
  "message": "vmscan: fix do_try_to_free_pages() return value when priority\u003d\u003d0 reclaim failure\n\nGreg Thelen reported recent Johannes\u0027s stack diet patch makes kernel hang.\n His test is following.\n\n  mount -t cgroup none /cgroups -o memory\n  mkdir /cgroups/cg1\n  echo $$ \u003e /cgroups/cg1/tasks\n  dd bs\u003d1024 count\u003d1024 if\u003d/dev/null of\u003d/data/foo\n  echo $$ \u003e /cgroups/tasks\n  echo 1 \u003e /cgroups/cg1/memory.force_empty\n\nActually, This OOM hard to try logic have been corrupted since following\ntwo years old patch.\n\n\tcommit a41f24ea9fd6169b147c53c2392e2887cc1d9247\n\tAuthor: Nishanth Aravamudan \u003cnacc@us.ibm.com\u003e\n\tDate:   Tue Apr 29 00:58:25 2008 -0700\n\n\t    page allocator: smarter retry of costly-order allocations\n\nOriginal intention was \"return success if the system have shrinkable zones\nthough priority\u003d\u003d0 reclaim was failure\".  But the above patch changed to\n\"return nr_reclaimed if .....\".  Oh, That forgot nr_reclaimed may be 0 if\npriority\u003d\u003d0 reclaim failure.\n\nAnd Johannes\u0027s patch 0aeb2339e54e (\"vmscan: remove all_unreclaimable scan\ncontrol\") made it more corrupt.  Originally, priority\u003d\u003d0 reclaim failure\non memcg return 0, but this patch changed to return 1.  It totally\nconfused memcg.\n\nThis patch fixes it completely.\n\nReported-by: Greg Thelen \u003cgthelen@google.com\u003e\nSigned-off-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nAcked-by: Johannes Weiner \u003channes@cmpxchg.org\u003e\nAcked-by: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nTested-by: Greg Thelen \u003cgthelen@google.com\u003e\nAcked-by: Balbir Singh \u003cbalbir@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": "915dceb487c11b1f1783df86908ba5e6e7317769",
      "old_mode": 33188,
      "old_path": "mm/vmscan.c",
      "new_id": "9c7e57cc63a34f7231b77a7d8b395d3157a34ba6",
      "new_mode": 33188,
      "new_path": "mm/vmscan.c"
    }
  ]
}