)]}'
{
  "log": [
    {
      "commit": "9eefe520c814f6f62c5d36a2ddcd3fb99dfdb30e",
      "tree": "064ce99674f144b681f8d365d1e20d99c8078d0c",
      "parents": [
        "f1a43f93f0f3bab418800eaccb9e2e3b5427e173"
      ],
      "author": {
        "name": "Nadia Derbey",
        "email": "Nadia.Derbey@bull.net",
        "time": "Fri Jul 25 01:48:08 2008 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@linux-foundation.org",
        "time": "Fri Jul 25 10:53:42 2008 -0700"
      },
      "message": "ipc: do not use a negative value to re-enable msgmni automatic recomputing\n\nThis patch proposes an alternative to the \"magical\npositive-versus-negative number trick\" Andrew complained about last week\nin http://lkml.org/lkml/2008/6/24/418.\n\nThis had been introduced with the patches that scale msgmni to the amount\nof lowmem.  With these patches, msgmni has a registered notification\nroutine that recomputes msgmni value upon memory add/remove or ipc\nnamespace creation/ removal.\n\nWhen msgmni is changed from user space (i.e.  value written to the proc\nfile), that notification routine is unregistered, and the way to make it\nregistered back is to write a negative value into the proc file.  This is\nthe \"magical positive-versus-negative number trick\".\n\nTo fix this, a new proc file is introduced: /proc/sys/kernel/auto_msgmni.\nThis file acts as ON/OFF for msgmni automatic recomputing.\n\nWith this patch, the process is the following:\n1) kernel boots in \"automatic recomputing mode\"\n   /proc/sys/kernel/msgmni contains the value that has been computed (depends\n                           on lowmem)\n   /proc/sys/kernel/automatic_msgmni contains \"1\"\n\n2) echo \u003cval\u003e \u003e /proc/sys/kernel/msgmni\n   . sets msg_ctlmni to \u003cval\u003e\n   . de-activates automatic recomputing (i.e. if, say, some memory is added\n     msgmni won\u0027t be recomputed anymore)\n   . /proc/sys/kernel/automatic_msgmni now contains \"0\"\n\n3) echo \"0\" \u003e /proc/sys/kernel/automatic_msgmni\n   . de-activates msgmni automatic recomputing\n     this has the same effect as 2) except that msg_ctlmni\u0027s value stays\n     blocked at its current value)\n\n3) echo \"1\" \u003e /proc/sys/kernel/automatic_msgmni\n   . recomputes msgmni\u0027s value based on the current available memory size\n     and number of ipc namespaces\n   . re-activates automatic recomputing for msgmni.\n\nSigned-off-by: Nadia Derbey \u003cNadia.Derbey@bull.net\u003e\nCc: Solofo Ramangalahy \u003cSolofo.Ramangalahy@bull.net\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "6546bc4279241e8fa432de1bb63a4f6f791fd669",
      "tree": "308f5c1621b1019a44800622ffc468a372f09434",
      "parents": [
        "91cfb2b4b57816de0c96de417b3238249f0b125f"
      ],
      "author": {
        "name": "Nadia Derbey",
        "email": "Nadia.Derbey@bull.net",
        "time": "Tue Apr 29 01:00:45 2008 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@linux-foundation.org",
        "time": "Tue Apr 29 08:06:13 2008 -0700"
      },
      "message": "ipc: re-enable msgmni automatic recomputing msgmni if set to negative\n\nThe enhancement as asked for by Yasunori: if msgmni is set to a negative\nvalue, register it back into the ipcns notifier chain.\n\nA new interface has been added to the notification mechanism:\nnotifier_chain_cond_register() registers a notifier block only if not already\nregistered.  With that new interface we avoid taking care of the states\nchanges in procfs.\n\nSigned-off-by: Nadia Derbey \u003cNadia.Derbey@bull.net\u003e\nCc: Yasunori Goto \u003cy-goto@jp.fujitsu.com\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nCc: Mingming Cao \u003ccmm@us.ibm.com\u003e\nCc: Pierre Peiffer \u003cpierre.peiffer@bull.net\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "e2c284d8a87f95df9b47c6a13168a844ca7c03e9",
      "tree": "6eb27ea254d47c94dbfb33da23314dd69479e56e",
      "parents": [
        "424450c1dbe72b6e2637e91108417d7d9580c4c3"
      ],
      "author": {
        "name": "Nadia Derbey",
        "email": "Nadia.Derbey@bull.net",
        "time": "Tue Apr 29 01:00:44 2008 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@linux-foundation.org",
        "time": "Tue Apr 29 08:06:12 2008 -0700"
      },
      "message": "ipc: recompute msgmni on ipc namespace creation/removal\n\nIntroduce a notification mechanism that aims at recomputing msgmni each time\nan ipc namespace is created or removed.\n\nThe ipc namespace notifier chain already defined for memory hotplug management\nis used for that purpose too.\n\nEach time a new ipc namespace is allocated or an existing ipc namespace is\nremoved, the ipcns notifier chain is notified.  The callback routine for each\nregistered ipc namespace is then activated in order to recompute msgmni for\nthat namespace.\n\nSigned-off-by: Nadia Derbey \u003cNadia.Derbey@bull.net\u003e\nCc: Yasunori Goto \u003cy-goto@jp.fujitsu.com\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nCc: Mingming Cao \u003ccmm@us.ibm.com\u003e\nCc: Pierre Peiffer \u003cpierre.peiffer@bull.net\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    },
    {
      "commit": "b6b337ad1c1d6fe11b09b35d75464b84b3e11f07",
      "tree": "df174a23a827cc43db76900d1ddbbef3ac9ddc90",
      "parents": [
        "0c40ba4fd64f98e7a5cba8ffaedbd68642a85700"
      ],
      "author": {
        "name": "Nadia Derbey",
        "email": "Nadia.Derbey@bull.net",
        "time": "Tue Apr 29 01:00:42 2008 -0700"
      },
      "committer": {
        "name": "Linus Torvalds",
        "email": "torvalds@linux-foundation.org",
        "time": "Tue Apr 29 08:06:12 2008 -0700"
      },
      "message": "ipc: recompute msgmni on memory add / remove\n\nIntroduce the registration of a callback routine that recomputes msg_ctlmni\nupon memory add / remove.\n\nA single notifier block is registered in the hotplug memory chain for all the\nipc namespaces.\n\nSince the ipc namespaces are not linked together, they have their own\nnotification chain: one notifier_block is defined per ipc namespace.\n\nEach time an ipc namespace is created (removed) it registers (unregisters) its\nnotifier block in (from) the ipcns chain.  The callback routine registered in\nthe memory chain invokes the ipcns notifier chain with the IPCNS_LOWMEM event.\n Each callback routine registered in the ipcns namespace, in turn, recomputes\nmsgmni for the owning namespace.\n\nSigned-off-by: Nadia Derbey \u003cNadia.Derbey@bull.net\u003e\nCc: Yasunori Goto \u003cy-goto@jp.fujitsu.com\u003e\nCc: Matt Helsley \u003cmatthltc@us.ibm.com\u003e\nCc: Mingming Cao \u003ccmm@us.ibm.com\u003e\nCc: Pierre Peiffer \u003cpierre.peiffer@bull.net\u003e\nSigned-off-by: Andrew Morton \u003cakpm@linux-foundation.org\u003e\nSigned-off-by: Linus Torvalds \u003ctorvalds@linux-foundation.org\u003e\n"
    }
  ]
}