)]}'
{
  "log": [
    {
      "commit": "cbb4f2646d77b536ed2b1500ef6641083228ed8f",
      "tree": "e238098c2239ca1a2ec978858f63566d0281d49a",
      "parents": [
        "56ad1740d9a8dc271e71fee234be662638c64458"
      ],
      "author": {
        "name": "Li Zefan",
        "email": "lizf@cn.fujitsu.com",
        "time": "Fri Jul 31 08:55:48 2009 +0200"
      },
      "committer": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Fri Jul 31 08:55:48 2009 +0200"
      },
      "message": "io context: fix ref counting\n\nCommit d9c7d394a8ebacb60097b192939ae9f15235225e\n(\"block: prevent possible io_context-\u003erefcount overflow\") mistakenly\nchanged atomic_inc(\u0026ioc-\u003enr_tasks) to atomic_long_inc(\u0026ioc-\u003erefcount).\n\nSigned-off-by: Li Zefan \u003clizf@cn.fujitsu.com\u003e\nAcked-by: Nikanth Karthikesan \u003cknikanth@suse.de\u003e\nSigned-off-by: Jens Axboe \u003cjens.axboe@oracle.com\u003e\n"
    },
    {
      "commit": "d9c7d394a8ebacb60097b192939ae9f15235225e",
      "tree": "4fbf9c7677acb03c23d05faba1a4b0bcfb6702b4",
      "parents": [
        "1d589bb16b825b3a7b4edd34d997f1f1f953033d"
      ],
      "author": {
        "name": "Nikanth Karthikesan",
        "email": "knikanth@novell.com",
        "time": "Wed Jun 10 12:57:06 2009 -0700"
      },
      "committer": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Wed Jun 10 23:07:15 2009 +0200"
      },
      "message": "block: prevent possible io_context-\u003erefcount overflow\n\nCurrently io_context has an atomic_t(32-bit) as refcount.  In the case of\ncfq, for each device against whcih a task does I/O, a reference to the\nio_context would be taken.  And when there are multiple process sharing\nio_contexts(CLONE_IO) would also have a reference to the same io_context.\n\nTheoretically the possible maximum number of processes sharing the same\nio_context + the number of disks/cfq_data referring to the same io_context\ncan overflow the 32-bit counter on a very high-end machine.\n\nEven though it is an improbable case, let us make it atomic_long_t.\n\nSigned-off-by: Nikanth Karthikesan \u003cknikanth@suse.de\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Jens Axboe \u003cjens.axboe@oracle.com\u003e\n"
    },
    {
      "commit": "da9cbc87395308a21465bd25441297bbba0477e1",
      "tree": "fabea3326cea434c0011fa00f3eb57854162117c",
      "parents": [
        "b984679efe1a616ec4ac919dba08286d71593900"
      ],
      "author": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Mon Jun 30 20:42:08 2008 +0200"
      },
      "committer": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Thu Jul 03 13:21:14 2008 +0200"
      },
      "message": "block: blkdev.h cleanup, move iocontext stuff to iocontext.h\n\nSigned-off-by: Jens Axboe \u003cjens.axboe@oracle.com\u003e\n"
    },
    {
      "commit": "d237e5c7ce82b6c7e1aa50348520a0c5a47274fa",
      "tree": "7ba37198dea89e4168cb660175057058ebbf11f1",
      "parents": [
        "a985aabe4d7a720b109c2b63549f8641676a9c88"
      ],
      "author": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Tue Apr 15 09:25:33 2008 +0200"
      },
      "committer": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Tue Apr 15 09:25:33 2008 +0200"
      },
      "message": "io context: increment task attachment count in ioc_task_link()\n\nThanks to Nikanth Karthikesan \u003cknikanth@suse.de\u003e for reporting this.\n\nSigned-off-by: Jens Axboe \u003cjens.axboe@oracle.com\u003e\n"
    },
    {
      "commit": "34e6bbf23c8f43e8713d9bd092680f1660494b4a",
      "tree": "908e97ac3d43882cb42bf57c41926852d3bc2f6e",
      "parents": [
        "00d61e3e8c12d5f395b167856d2b3c430816afb0"
      ],
      "author": {
        "name": "Fabio Checconi",
        "email": "fabio@gandalf.sssup.i",
        "time": "Wed Apr 02 14:31:02 2008 +0200"
      },
      "committer": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Wed Apr 02 15:42:20 2008 +0200"
      },
      "message": "cfq-iosched: fix rcu freeing of cfq io contexts\n\nSLAB_DESTROY_BY_RCU is not a direct substitute for normal call_rcu()\nfreeing, since it\u0027ll page freeing but NOT object freeing. So change\ncfq to do the freeing on its own.\n\nSigned-off-by: Fabio Checconi \u003cfabio@gandalf.sssup.it\u003e\nAcked-by: Paul E. McKenney \u003cpaulmck@linux.vnet.ibm.com\u003e\nSigned-off-by: Jens Axboe \u003cjens.axboe@oracle.com\u003e\n"
    },
    {
      "commit": "ffc4e7595734cf768fa60cea8a4d545dfef8231a",
      "tree": "9b95aca67ea7c9e87254da501f73cca64504051d",
      "parents": [
        "84e9e03c55c2456799ab19f1d577e72f721fdd39"
      ],
      "author": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Tue Feb 19 10:02:29 2008 +0100"
      },
      "committer": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Tue Feb 19 10:04:00 2008 +0100"
      },
      "message": "cfq-iosched: add hlist for browsing parallel to the radix tree\n\nIt\u0027s cumbersome to browse a radix tree from start to finish, especially\nsince we modify keys when a process exits. So add a hlist for the single\npurpose of browsing over all known cfq_io_contexts, used for exit,\nio prio change, etc.\n\nThis fixes http://bugzilla.kernel.org/show_bug.cgi?id\u003d9948\n\nSigned-off-by: Jens Axboe \u003cjens.axboe@oracle.com\u003e\n"
    },
    {
      "commit": "4ac845a2e9a816ed5a7b301f56dcc0a3d0b1ba4d",
      "tree": "602f15808d0f3dcdfcd7cc4491b2cc2ccd266fd2",
      "parents": [
        "66dac98ed0de7a1125fb0dd7907f238f6b9d2f60"
      ],
      "author": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Thu Jan 24 08:44:49 2008 +0100"
      },
      "committer": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Mon Jan 28 10:50:33 2008 +0100"
      },
      "message": "block: cfq: make the io contect sharing lockless\n\nThe io context sharing introduced a per-ioc spinlock, that would protect\nthe cfq io context lookup. That is a regression from the original, since\nwe never needed any locking there because the ioc/cic were process private.\n\nThe cic lookup is changed from an rbtree construct to a radix tree, which\nwe can then use RCU to make the reader side lockless. That is the performance\ncritical path, modifying the radix tree is only done on process creation\n(when that process first does IO, actually) and on process exit (if that\nprocess has done IO).\n\nAs it so happens, radix trees are also much faster for this type of\nlookup where the key is a pointer. It\u0027s a very sparse tree.\n\nSigned-off-by: Jens Axboe \u003cjens.axboe@oracle.com\u003e\n"
    },
    {
      "commit": "d38ecf935fcb10264a6bc190855d9595165e6eeb",
      "tree": "64e3146ef76678ad3ae8f75c32df9f25ea470953",
      "parents": [
        "fd0928df98b9578be8a786ac0cb78a47a5e17a20"
      ],
      "author": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Thu Jan 24 08:53:35 2008 +0100"
      },
      "committer": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Mon Jan 28 10:50:31 2008 +0100"
      },
      "message": "io context sharing: preliminary support\n\nDetach task state from ioc, instead keep track of how many processes\nare accessing the ioc.\n\nSigned-off-by: Jens Axboe \u003cjens.axboe@oracle.com\u003e\n"
    },
    {
      "commit": "fd0928df98b9578be8a786ac0cb78a47a5e17a20",
      "tree": "70a34cf207bea1bec28e59cf0dba7d20e7f8b0f1",
      "parents": [
        "91525300baf162e83e923b09ca286f9205e21522"
      ],
      "author": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Thu Jan 24 08:52:45 2008 +0100"
      },
      "committer": {
        "name": "Jens Axboe",
        "email": "jens.axboe@oracle.com",
        "time": "Mon Jan 28 10:50:29 2008 +0100"
      },
      "message": "ioprio: move io priority from task_struct to io_context\n\nThis is where it belongs and then it doesn\u0027t take up space for a\nprocess that doesn\u0027t do IO.\n\nSigned-off-by: Jens Axboe \u003cjens.axboe@oracle.com\u003e\n"
    }
  ]
}