)]}'
{
  "commit": "35282a2de4e5e4e173ab61aa9d7015886021a821",
  "tree": "06d20ad1a132e15e4fb7447cd9b139a4921ecfc9",
  "parents": [
    "7f33d49a2ed546e01f7b1d0607661810f2421859"
  ],
  "author": {
    "name": "Brice Goglin",
    "email": "Brice.Goglin@ens-lyon.org",
    "time": "Tue Jun 16 15:32:43 2009 -0700"
  },
  "committer": {
    "name": "Linus Torvalds",
    "email": "torvalds@linux-foundation.org",
    "time": "Tue Jun 16 19:47:41 2009 -0700"
  },
  "message": "migration: only migrate_prep() once per move_pages()\n\nmigrate_prep() is fairly expensive (72us on 16-core barcelona 1.9GHz).\nCommit 3140a2273009c01c27d316f35ab76a37e105fdd8 improved move_pages()\nthroughput by breaking it into chunks, but it also made migrate_prep() be\ncalled once per chunk (every 128pages or so) instead of once per\nmove_pages().\n\nThis patch reverts to calling migrate_prep() only once per chunk as we did\nbefore 2.6.29.  It is also a followup to commit\n0aedadf91a70a11c4a3e7c7d99b21e5528af8d5d (\"mm: move migrate_prep out from\nunder mmap_sem\").\n\nThis improves migration throughput on the above machine from 600MB/s to\n750MB/s.\n\nSigned-off-by: Brice Goglin \u003cBrice.Goglin@inria.fr\u003e\nAcked-by: Christoph Lameter \u003ccl@linux-foundation.org\u003e\nCc: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Heiko Carstens \u003cheiko.carstens@de.ibm.com\u003e\nCc: Nick Piggin \u003cnickpiggin@yahoo.com.au\u003e\nCc: Hugh Dickins \u003chugh.dickins@tiscali.co.uk\u003e\nCc: Rik van Riel \u003criel@redhat.com\u003e\nCc: Lee Schermerhorn \u003clee.schermerhorn@hp.com\u003e\nReviewed-by: 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": "5a24923e7fd7a398fc3f0b323270eafe0b4e29b3",
      "old_mode": 33188,
      "old_path": "mm/migrate.c",
      "new_id": "939888f9ddab21ecabdc2f732a8ee604cb56da13",
      "new_mode": 33188,
      "new_path": "mm/migrate.c"
    }
  ]
}