)]}'
{
  "commit": "b4fe51823d797d6959b2eee7868023e61606daa9",
  "tree": "e078feaa1cdfbbdc98b5f5f668fecc37c1907b2e",
  "parents": [
    "0b7570e77f7c3abd43107dabc47ea89daf9a1cba"
  ],
  "author": {
    "name": "Oleg Nesterov",
    "email": "oleg@redhat.com",
    "time": "Wed Sep 23 15:56:47 2009 -0700"
  },
  "committer": {
    "name": "Linus Torvalds",
    "email": "torvalds@linux-foundation.org",
    "time": "Thu Sep 24 07:21:00 2009 -0700"
  },
  "message": "do_wait() wakeup optimization: child_wait_callback: check __WNOTHREAD case\n\nSuggested by Roland.\n\ndo_wait(__WNOTHREAD) can only succeed if the caller is either ptracer, or\nit is -\u003ereal_parent and the child is not traced. IOW, caller \u003d\u003d p-\u003eparent\notherwise we should not wake up.\n\nChange child_wait_callback() to check this. Ratan reports the workload with\nCPU load \u003e99% caused by unnecessary wakeups, should be fixed by this patch.\n\nSigned-off-by: Oleg Nesterov \u003coleg@redhat.com\u003e\nAcked-by: Roland McGrath \u003croland@redhat.com\u003e\nCc: Ingo Molnar \u003cmingo@elte.hu\u003e\nCc: Ratan Nalumasu \u003crnalumasu@gmail.com\u003e\nCc: Vitaly Mayatskikh \u003cvmayatsk@redhat.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": "7838b4d687743cb2e927e13d9cefe482e1b662d0",
      "old_mode": 33188,
      "old_path": "kernel/exit.c",
      "new_id": "270a68b7f22fd8259512f97be2696d451fc8a744",
      "new_mode": 33188,
      "new_path": "kernel/exit.c"
    }
  ]
}