)]}'
{
  "commit": "2f66a68f3fac2e94da360c342ff78ab45553f86c",
  "tree": "ec8de9c7d18d866e63e2c9bcbecf902896b687bd",
  "parents": [
    "fe1ff49d0d1c30254dbfc84c3786eb538e0cc7d1"
  ],
  "author": {
    "name": "Mel Gorman",
    "email": "mel@csn.ul.ie",
    "time": "Mon Sep 21 17:02:31 2009 -0700"
  },
  "committer": {
    "name": "Linus Torvalds",
    "email": "torvalds@linux-foundation.org",
    "time": "Tue Sep 22 07:17:33 2009 -0700"
  },
  "message": "page-allocator: change migratetype for all pageblocks within a high-order page during __rmqueue_fallback\n\nWhen there are no pages of a target migratetype free, the page allocator\nselects a high-order block of another migratetype to allocate from.  When\nthe order of the page taken is greater than pageblock_order, all\npageblocks within that high-order page should change migratetype so that\npages are later freed to the correct free-lists.\n\nThe current behaviour is that pageblocks change migratetype if the order\nbeing split matches the pageblock_order.  When pageblock_order \u003c\nMAX_ORDER-1, ownership is not changing correct and pages are being later\nfreed to the incorrect list and this impacts fragmentation avoidance.\n\nThis patch changes all pageblocks within the high-order page being split\nto the correct migratetype.  Without the patch, allocation success rates\nfor hugepages under stress were about 59% of physical memory on x86-64.\nWith the patch applied, this goes up to 65%.\n\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nCc: Andy Whitcroft \u003capw@shadowen.org\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.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": "9242d13f4ff35045e473fe03095caf6a41676aa8",
      "old_mode": 33188,
      "old_path": "mm/page_alloc.c",
      "new_id": "20759803a64ad151ef7d49f85308ff99b2b5c073",
      "new_mode": 33188,
      "new_path": "mm/page_alloc.c"
    }
  ]
}