)]}'
{
  "commit": "0437e109e1841607f2988891eaa36c531c6aa6ac",
  "tree": "e9d8f170786f7e33d4c5829cb008cf38d42a2014",
  "parents": [
    "0e6aca43e08a62a48d6770e9a159dbec167bf4c6"
  ],
  "author": {
    "name": "Ingo Molnar",
    "email": "mingo@elte.hu",
    "time": "Mon Jul 09 18:51:57 2007 +0200"
  },
  "committer": {
    "name": "Ingo Molnar",
    "email": "mingo@elte.hu",
    "time": "Mon Jul 09 18:51:57 2007 +0200"
  },
  "message": "sched: zap the migration init / cache-hot balancing code\n\nthe SMP load-balancer uses the boot-time migration-cost estimation\ncode to attempt to improve the quality of balancing. The reason for\nthis code is that the discrete priority queues do not preserve\nthe order of scheduling accurately, so the load-balancer skips\ntasks that were running on a CPU \u0027recently\u0027.\n\nthis code is fundamental fragile: the boot-time migration cost detector\ndoesnt really work on systems that had large L3 caches, it caused boot\ndelays on large systems and the whole cache-hot concept made the\nbalancing code pretty undeterministic as well.\n\n(and hey, i wrote most of it, so i can say it out loud that it sucks ;-)\n\nunder CFS the same purpose of cache affinity can be achieved without\nany special cache-hot special-case: tasks are sorted in the \u0027timeline\u0027\ntree and the SMP balancer picks tasks from the left side of the\ntree, thus the most cache-cold task is balanced automatically.\n\nSigned-off-by: Ingo Molnar \u003cmingo@elte.hu\u003e\n",
  "tree_diff": [
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