)]}'
{
  "commit": "c713216deebd95d2b0ab38fef8bb2361c0180c2d",
  "tree": "a5a8c61be427e3591811ff712b9ec7ef2f1a1f20",
  "parents": [
    "2bd0cfbde2c0a74e209acbf045f1298cc2f61e01"
  ],
  "author": {
    "name": "Mel Gorman",
    "email": "mel@csn.ul.ie",
    "time": "Wed Sep 27 01:49:43 2006 -0700"
  },
  "committer": {
    "name": "Linus Torvalds",
    "email": "torvalds@g5.osdl.org",
    "time": "Wed Sep 27 08:26:11 2006 -0700"
  },
  "message": "[PATCH] Introduce mechanism for registering active regions of memory\n\nAt a basic level, architectures define structures to record where active\nranges of page frames are located.  Once located, the code to calculate zone\nsizes and holes in each architecture is very similar.  Some of this zone and\nhole sizing code is difficult to read for no good reason.  This set of patches\neliminates the similar-looking architecture-specific code.\n\nThe patches introduce a mechanism where architectures register where the\nactive ranges of page frames are with add_active_range().  When all areas have\nbeen discovered, free_area_init_nodes() is called to initialise the pgdat and\nzones.  The zone sizes and holes are then calculated in an architecture\nindependent manner.\n\nPatch 1 introduces the mechanism for registering and initialising PFN ranges\nPatch 2 changes ppc to use the mechanism - 139 arch-specific LOC removed\nPatch 3 changes x86 to use the mechanism - 136 arch-specific LOC removed\nPatch 4 changes x86_64 to use the mechanism - 74 arch-specific LOC removed\nPatch 5 changes ia64 to use the mechanism - 52 arch-specific LOC removed\nPatch 6 accounts for mem_map as a memory hole as the pages are not reclaimable.\n\tIt adjusts the watermarks slightly\n\nTony Luck has successfully tested for ia64 on Itanium with tiger_defconfig,\ngensparse_defconfig and defconfig.  Bob Picco has also tested and debugged on\nIA64.  Jack Steiner successfully boot tested on a mammoth SGI IA64-based\nmachine.  These were on patches against 2.6.17-rc1 and release 3 of these\npatches but there have been no ia64-changes since release 3.\n\nThere are differences in the zone sizes for x86_64 as the arch-specific code\nfor x86_64 accounts the kernel image and the starting mem_maps as memory holes\nbut the architecture-independent code accounts the memory as present.\n\nThe big benefit of this set of patches is a sizable reduction of\narchitecture-specific code, some of which is very hairy.  There should be a\ngreater reduction when other architectures use the same mechanisms for zone\nand hole sizing but I lack the hardware to test on.\n\nAdditional credit;\n\tDave Hansen for the initial suggestion and comments on early patches\n\tAndy Whitcroft for reviewing early versions and catching numerous\n\t\terrors\n\tTony Luck for testing and debugging on IA64\n\tBob Picco for fixing bugs related to pfn registration, reviewing a\n\t\tnumber of patch revisions, providing a number of suggestions\n\t\ton future direction and testing heavily\n\tJack Steiner and Robin Holt for testing on IA64 and clarifying\n\t\tissues related to memory holes\n\tYasunori for testing on IA64\n\tAndi Kleen for reviewing and feeding back about x86_64\n\tChristian Kujau for providing valuable information related to ACPI\n\t\tproblems on x86_64 and testing potential fixes\n\nThis patch:\n\nDefine the structure to represent an active range of page frames within a node\nin an architecture independent manner.  Architectures are expected to register\nactive ranges of PFNs using add_active_range(nid, start_pfn, end_pfn) and call\nfree_area_init_nodes() passing the PFNs of the end of each zone.\n\nSigned-off-by: Mel Gorman \u003cmel@csn.ul.ie\u003e\nSigned-off-by: Bob Picco \u003cbob.picco@hp.com\u003e\nCc: Dave Hansen \u003chaveblue@us.ibm.com\u003e\nCc: Andy Whitcroft \u003capw@shadowen.org\u003e\nCc: Andi Kleen \u003cak@muc.de\u003e\nCc: Benjamin Herrenschmidt \u003cbenh@kernel.crashing.org\u003e\nCc: Paul Mackerras \u003cpaulus@samba.org\u003e\nCc: \"Keith Mannthey\" \u003ckmannth@gmail.com\u003e\nCc: \"Luck, Tony\" \u003ctony.luck@intel.com\u003e\nCc: KAMEZAWA Hiroyuki \u003ckamezawa.hiroyu@jp.fujitsu.com\u003e\nCc: Yasunori Goto \u003cy-goto@jp.fujitsu.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n",
  "tree_diff": [
    {
      "type": "modify",
      "old_id": "856f0ee7e84ab53370f6df38d791547bfbfdcaa8",
      "old_mode": 33188,
      "old_path": "include/linux/mm.h",
      "new_id": "c0402da7cce0b5e454cdb4315653362cf62fd998",
      "new_mode": 33188,
      "new_path": "include/linux/mm.h"
    },
    {
      "type": "modify",
      "old_id": "3693f1a5278839c23243691564a5085af0617313",
      "old_mode": 33188,
      "old_path": "include/linux/mmzone.h",
      "new_id": "7fa1cbe9fa7aac46d3f82929065479449dc42f66",
      "new_mode": 33188,
      "new_path": "include/linux/mmzone.h"
    },
    {
      "type": "modify",
      "old_id": "9810f0a60db7720da211386298422e138341e16e",
      "old_mode": 33188,
      "old_path": "mm/page_alloc.c",
      "new_id": "26c9939857faa271370adff3543181dc07b3284f",
      "new_mode": 33188,
      "new_path": "mm/page_alloc.c"
    }
  ]
}