)]}'
{
  "log": [
    {
      "commit": "c18258c6f0848f97e85287f6271c511a092bb784",
      "tree": "16c057a171b7623895ee208459392c1104193b84",
      "parents": [
        "35fa2048ab13d1be846be612e395c15c200bd51c"
      ],
      "author": {
        "name": "Eric W. Biederman",
        "email": "ebiederm@xmission.com",
        "time": "Wed Sep 27 01:51:06 2006 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Wed Sep 27 08:26:19 2006 -0700"
      },
      "message": "[PATCH] pid: Implement transfer_pid and use it to simplify de_thread\n\nIn de_thread we move pids from one process to another, a rather ugly case.\nThe function transfer_pid makes it clear what we are doing, and makes the\naction atomic.  This is useful we ever want to atomically traverse the\nprocess group and session lists, in a rcu safe manner.\n\nEven if the atomic properties this change should be a win as transfer_pid\nshould be less code to execute than executing both attach_pid and\ndetach_pid, and this should make de_thread slightly smaller as only a\nsingle function call needs to be emitted.  The only downside is that the\ncode might be slower to execute as the odds are against transfer_pid being\nin cache.\n\nSigned-off-by: Eric W. Biederman \u003cebiederm@xmission.com\u003e\nCc: Oleg Nesterov \u003coleg@tv-sign.ru\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "92476d7fc0326a409ab1d3864a04093a6be9aca7",
      "tree": "ea50a5a31522492d9915e0763a7adc6ac87c4fbc",
      "parents": [
        "8c7904a00b06d2ee51149794b619e07369fcf9d4"
      ],
      "author": {
        "name": "Eric W. Biederman",
        "email": "ebiederm@xmission.com",
        "time": "Fri Mar 31 02:31:42 2006 -0800"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Fri Mar 31 12:19:00 2006 -0800"
      },
      "message": "[PATCH] pidhash: Refactor the pid hash table\n\nSimplifies the code, reduces the need for 4 pid hash tables, and makes the\ncode more capable.\n\nIn the discussions I had with Oleg it was felt that to a large extent the\ncleanup itself justified the work.  With struct pid being dynamically\nallocated meant we could create the hash table entry when the pid was\nallocated and free the hash table entry when the pid was freed.  Instead of\nplaying with the hash lists when ever a process would attach or detach to a\nprocess.\n\nFor myself the fact that it gave what my previous task_ref patch gave for free\nwith simpler code was a big win.  The problem is that if you hold a reference\nto struct task_struct you lock in 10K of low memory.  If you do that in a user\ncontrollable way like /proc does, with an unprivileged but hostile user space\napplication with typical resource limits of 1000 fds and 100 processes I can\ntrigger the OOM killer by consuming all of low memory with task structs, on a\nmachine wight 1GB of low memory.\n\nIf I instead hold a reference to struct pid which holds a pointer to my\ntask_struct, I don\u0027t suffer from that problem because struct pid is 2 orders\nof magnitude smaller.  In fact struct pid is small enough that most other\nkernel data structures dwarf it, so simply limiting the number of referring\ndata structures is enough to prevent exhaustion of low memory.\n\nThis splits the current struct pid into two structures, struct pid and struct\npid_link, and reduces our number of hash tables from PIDTYPE_MAX to just one.\nstruct pid_link is the per process linkage into the hash tables and lives in\nstruct task_struct.  struct pid is given an indepedent lifetime, and holds\npointers to each of the pid types.\n\nThe independent life of struct pid simplifies attach_pid, and detach_pid,\nbecause we are always manipulating the list of pids and not the hash table.\nIn addition in giving struct pid an indpendent life it makes the concept much\nmore powerful.\n\nKernel data structures can now embed a struct pid * instead of a pid_t and\nnot suffer from pid wrap around problems or from keeping unnecessarily\nlarge amounts of memory allocated.\n\nSigned-off-by: Eric W. Biederman \u003cebiederm@xmission.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "47e65328a7b1cdfc4e3102e50d60faf94ebba7d3",
      "tree": "78e00a5321cca87767806a91e623e71b5c6637c7",
      "parents": [
        "88531f725bd52e37a7be726860e4ff3f09031d89"
      ],
      "author": {
        "name": "Oleg Nesterov",
        "email": "oleg@tv-sign.ru",
        "time": "Tue Mar 28 16:11:25 2006 -0800"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Tue Mar 28 18:36:44 2006 -0800"
      },
      "message": "[PATCH] pids: kill PIDTYPE_TGID\n\nThis patch kills PIDTYPE_TGID pid_type thus saving one hash table in\nkernel/pid.c and speeding up subthreads create/destroy a bit.  It is also a\npreparation for the further tref/pids rework.\n\nThis patch adds \u0027struct list_head thread_group\u0027 to \u0027struct task_struct\u0027\ninstead.\n\nWe don\u0027t detach group leader from PIDTYPE_PID namespace until another\nthread inherits it\u0027s -\u003epid \u003d\u003d -\u003etgid, so we are safe wrt premature\nfree_pidmap(-\u003etgid) call.\n\nCurrently there are no users of find_task_by_pid_type(PIDTYPE_TGID).\nShould the need arise, we can use find_task_by_pid()-\u003egroup_leader.\n\nSigned-off-by: Oleg Nesterov \u003coleg@tv-sign.ru\u003e\nAcked-By: Eric Biederman \u003cebiederm@xmission.com\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "d73d65293e3e2de7e916a89c8da30be0948afab7",
      "tree": "62b0ca76e3099c927f2960856dd060b136a8ccef",
      "parents": [
        "652486fb84a07ed750f1c11639518f55808bf555"
      ],
      "author": {
        "name": "Eric W. Biederman",
        "email": "ebiederm@xmission.com",
        "time": "Tue Mar 28 16:11:03 2006 -0800"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@g5.osdl.org",
        "time": "Tue Mar 28 18:36:40 2006 -0800"
      },
      "message": "[PATCH] pidhash: kill switch_exec_pids\n\nswitch_exec_pids is only called from de_thread by way of exec, and it is\nonly called when we are exec\u0027ing from a non thread group leader.\n\nCurrently switch_exec_pids gives the leader the pid of the thread and\nunhashes and rehashes all of the process groups.  The leader is already in\nthe EXIT_DEAD state so no one cares about it\u0027s pids.  The only concern for\nthe leader is that __unhash_process called from release_task will function\ncorrectly.  If we don\u0027t touch the leader at all we know that\n__unhash_process will work fine so there is no need to touch the leader.\n\nFor the task becomming the thread group leader, we just need to give it the\npid of the old thread group leader, add it to the task list, and attach it\nto the session and the process group of the thread group.\n\nCurrently de_thread is also adding the task to the task list which is just\nsilly.\n\nCurrently the only leader of __detach_pid besides detach_pid is\nswitch_exec_pids because of the ugly extra work that was being\nperformed.\n\nSo this patch removes switch_exec_pids because it is doing too much, it is\ncreating an unnecessary special case in pid.c, duing work duplicated in\nde_thread, and generally obscuring what it is going on.\n\nThe necessary work is added to de_thread, and it seems to be a little\nclearer there what is going on.\n\nSigned-off-by: Eric W. Biederman \u003cebiederm@xmission.com\u003e\nCc: Oleg Nesterov \u003coleg@tv-sign.ru\u003e\nCc: Kirill Korotaev \u003cdev@sw.ru\u003e\nSigned-off-by: Andrew Morton \u003cakpm@osdl.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@osdl.org\u003e\n"
    },
    {
      "commit": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2",
      "tree": "0bba044c4ce775e45a88a51686b5d9f90697ea9d",
      "parents": [],
      "author": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Sat Apr 16 15:20:36 2005 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@ppc970.osdl.org",
        "time": "Sat Apr 16 15:20:36 2005 -0700"
      },
      "message": "Linux-2.6.12-rc2\n\nInitial git repository build. I\u0027m not bothering with the full history,\neven though we have it. We can create a separate \"historical\" git\narchive of that later if we want to, and in the meantime it\u0027s about\n3.2GB when imported into git - space that would just make the early\ngit days unnecessarily complicated, when we don\u0027t have a lot of good\ninfrastructure for it.\n\nLet it rip!\n"
    }
  ]
}