)]}'
{
  "commit": "a8bbf72ab9b3072ece630d97689145b1a2f01221",
  "tree": "4d55318fff1aecd3c5d2c1e877847bcb2347dd2e",
  "parents": [
    "252e48389ed30d7c77385fb92fca765a680de408"
  ],
  "author": {
    "name": "Mel Gorman",
    "email": "mel@csn.ul.ie",
    "time": "Tue Jul 31 00:37:30 2007 -0700"
  },
  "committer": {
    "name": "Linus Torvalds",
    "email": "torvalds@woody.linux-foundation.org",
    "time": "Tue Jul 31 15:39:36 2007 -0700"
  },
  "message": "Do not trigger OOM-killer for high-order allocation failures\n\nout_of_memory() may be called when an allocation is failing and the direct\nreclaim is not making any progress.  This does not take into account the\nrequested order of the allocation.  If the request if for an order larger\nthan PAGE_ALLOC_COSTLY_ORDER, it is reasonable to fail the allocation\nbecause the kernel makes no guarantees about those allocations succeeding.\n\nThis false OOM situation can occur if a user is trying to grow the hugepage\npool in a script like;\n\n#!/bin/bash\nREQUIRED\u003d$1\necho 1 \u003e /proc/sys/vm/hugepages_treat_as_movable\necho $REQUIRED \u003e /proc/sys/vm/nr_hugepages\nACTUAL\u003d`cat /proc/sys/vm/nr_hugepages`\nwhile [ $REQUIRED -ne $ACTUAL ]; do\n\techo Huge page pool at $ACTUAL growing to $REQUIRED\n\techo $REQUIRED \u003e /proc/sys/vm/nr_hugepages\n\tACTUAL\u003d`cat /proc/sys/vm/nr_hugepages`\n\tsleep 1\ndone\n\nThis is a reasonable scenario when ZONE_MOVABLE is in use but triggers OOM\neasily on 2.6.23-rc1. This patch will fail an allocation for an order above\nPAGE_ALLOC_COSTLY_ORDER instead of killing processes and retrying.\n\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nAcked-by: Andy Whitcroft \u003capw@shadowen.org\u003e\nCc: David Rientjes \u003crientjes@google.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": "0bd4d82ddfffb55494bb94d5ce6120f56416e07c",
      "old_mode": 33188,
      "old_path": "mm/page_alloc.c",
      "new_id": "3da85b81dabb32608fa065f8086de64f725f5af8",
      "new_mode": 33188,
      "new_path": "mm/page_alloc.c"
    }
  ]
}