On Thu, 2013-07-25 at 08:17 +0800, Hush Bensen wrote: : > Thanks for your explaination, very useful for me. ;-) Btw, what's the > eject method done? On bare metal, the eject method makes a target device electrically isolated and physically removable. On virtualized environment, the eject method makes a target device unassigned and released. > Could you give me the calltrace of add_memory and remove_memory? I > don't have machine support hotplug, but I hope to investigate how > ACPI part works for memory hotplug. ;-) Here you go. [ 84.883517] [<ffffffff8153e8a4>] add_memory+0x24/0x185 [ 84.883525] [<ffffffff812ca331>] ? acpi_get_pxm+0x2b/0x4e [ 84.883533] [<ffffffff81303418>] acpi_memory_device_add+0x144/0x274 [ 84.883539] [<ffffffff812c1b25>] acpi_bus_device_attach+0x80/0xd9 [ 84.883545] [<ffffffff812c2b65>] acpi_bus_scan+0x65/0x9f [ 84.883551] [<ffffffff812c2c1d>] acpi_scan_bus_device_check +0x7e/0x10f [ 84.883556] [<ffffffff812c2cc1>] acpi_scan_device_check+0x13/0x15 [ 84.883562] [<ffffffff812bbdab>] acpi_os_execute_deferred+0x25/0x32 [ 84.883568] [<ffffffff81057cbc>] process_one_work+0x229/0x3d3 [ 84.883573] [<ffffffff81057bfa>] ? process_one_work+0x167/0x3d3 [ 84.883579] [<ffffffff81058248>] worker_thread+0x133/0x200 [ 84.883584] [<ffffffff81058115>] ? rescuer_thread+0x280/0x280 [ 84.883591] [<ffffffff8105e0c3>] kthread+0xb1/0xb9 [ 84.883598] [<ffffffff8105e012>] ? __kthread_parkme+0x65/0x65 [ 84.883604] [<ffffffff81556c9c>] ret_from_fork+0x7c/0xb0 [ 84.883610] [<ffffffff8105e012>] ? __kthread_parkme+0x65/0x65 [ 129.586622] [<ffffffff8153f4b1>] remove_memory+0x22/0x85 [ 129.586627] [<ffffffff813031c6>] acpi_memory_device_remove+0x77/0xa7 [ 129.586631] [<ffffffff812c0f95>] acpi_bus_device_detach+0x3d/0x5e [ 129.586634] [<ffffffff812c0ff8>] acpi_bus_trim+0x42/0x7a [ 129.586637] [<ffffffff812c1587>] acpi_scan_hot_remove+0x1ba/0x261 [ 129.586641] [<ffffffff812c16ce>] acpi_bus_device_eject+0xa0/0xd0 [ 129.586644] [<ffffffff812bbdab>] acpi_os_execute_deferred+0x25/0x32 [ 129.586648] [<ffffffff81057cbc>] process_one_work+0x229/0x3d3 [ 129.586652] [<ffffffff81057bfa>] ? process_one_work+0x167/0x3d3 [ 129.586655] [<ffffffff81058248>] worker_thread+0x133/0x200 [ 129.586658] [<ffffffff81058115>] ? rescuer_thread+0x280/0x280 [ 129.586663] [<ffffffff8105e0c3>] kthread+0xb1/0xb9 [ 129.586667] [<ffffffff8105e012>] ? __kthread_parkme+0x65/0x65 [ 129.586671] [<ffffffff81556c9c>] ret_from_fork+0x7c/0xb0 [ 129.586675] [<ffffffff8105e012>] ? __kthread_parkme+0x65/0x65 -Toshi -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>