)]}'
{
  "commit": "d7868dae893c83c50c7824bc2bc75f93d114669f",
  "tree": "7c9e56513ecbbf086c81ebff77310f80e0232ecc",
  "parents": [
    "08951e545918c1594434d000d88a7793e2452a9b"
  ],
  "author": {
    "name": "Mel Gorman",
    "email": "mgorman@suse.de",
    "time": "Fri Jul 08 15:39:38 2011 -0700"
  },
  "committer": {
    "name": "Linus Torvalds",
    "email": "torvalds@linux-foundation.org",
    "time": "Fri Jul 08 21:14:43 2011 -0700"
  },
  "message": "mm: vmscan: do not apply pressure to slab if we are not applying pressure to zone\n\nDuring allocator-intensive workloads, kswapd will be woken frequently\ncausing free memory to oscillate between the high and min watermark.  This\nis expected behaviour.\n\nWhen kswapd applies pressure to zones during node balancing, it checks if\nthe zone is above a high+balance_gap threshold.  If it is, it does not\napply pressure but it unconditionally shrinks slab on a global basis which\nis excessive.  In the event kswapd is being kept awake due to a high small\nunreclaimable zone, it skips zone shrinking but still calls shrink_slab().\n\nOnce pressure has been applied, the check for zone being unreclaimable is\nbeing made before the check is made if all_unreclaimable should be set.\nThis miss of unreclaimable can cause has_under_min_watermark_zone to be\nset due to an unreclaimable zone preventing kswapd backing off on\ncongestion_wait().\n\nSigned-off-by: Mel Gorman \u003cmgorman@suse.de\u003e\nReported-by: Pádraig Brady \u003cP@draigBrady.com\u003e\nTested-by: Pádraig Brady \u003cP@draigBrady.com\u003e\nTested-by: Andrew Lutomirski \u003cluto@mit.edu\u003e\nAcked-by: Rik van Riel \u003criel@redhat.com\u003e\nReviewed-by: Minchan Kim \u003cminchan.kim@gmail.com\u003e\nReviewed-by: KOSAKI Motohiro \u003ckosaki.motohiro@jp.fujitsu.com\u003e\nCc: Johannes Weiner \u003channes@cmpxchg.org\u003e\nCc: \u003cstable@kernel.org\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": "04c49fe781fe7f7f9ba125e4078e18c763b99e1b",
      "old_mode": 33188,
      "old_path": "mm/vmscan.c",
      "new_id": "a0245861934a7ac4ac7de1a821e70a28a08b91a8",
      "new_mode": 33188,
      "new_path": "mm/vmscan.c"
    }
  ]
}