| Andi Kleen | facb601 | 2009-12-16 12:20:00 +0100 | [diff] [blame] | 1 | What: /sys/devices/system/memory/soft_offline_page |
| 2 | Date: Sep 2009 |
| 3 | KernelVersion: 2.6.33 |
| 4 | Contact: andi@firstfloor.org |
| 5 | Description: |
| 6 | Soft-offline the memory page containing the physical address |
| 7 | written into this file. Input is a hex number specifying the |
| 8 | physical address of the page. The kernel will then attempt |
| 9 | to soft-offline it, by moving the contents elsewhere or |
| 10 | dropping it if possible. The kernel will then be placed |
| 11 | on the bad page list and never be reused. |
| 12 | |
| 13 | The offlining is done in kernel specific granuality. |
| 14 | Normally it's the base page size of the kernel, but |
| 15 | this might change. |
| 16 | |
| 17 | The page must be still accessible, not poisoned. The |
| 18 | kernel will never kill anything for this, but rather |
| 19 | fail the offline. Return value is the size of the |
| 20 | number, or a error when the offlining failed. Reading |
| 21 | the file is not allowed. |
| 22 | |
| 23 | What: /sys/devices/system/memory/hard_offline_page |
| 24 | Date: Sep 2009 |
| 25 | KernelVersion: 2.6.33 |
| 26 | Contact: andi@firstfloor.org |
| 27 | Description: |
| 28 | Hard-offline the memory page containing the physical |
| 29 | address written into this file. Input is a hex number |
| 30 | specifying the physical address of the page. The |
| 31 | kernel will then attempt to hard-offline the page, by |
| 32 | trying to drop the page or killing any owner or |
| 33 | triggering IO errors if needed. Note this may kill |
| 34 | any processes owning the page. The kernel will avoid |
| 35 | to access this page assuming it's poisoned by the |
| 36 | hardware. |
| 37 | |
| 38 | The offlining is done in kernel specific granuality. |
| 39 | Normally it's the base page size of the kernel, but |
| 40 | this might change. |
| 41 | |
| 42 | Return value is the size of the number, or a error when |
| 43 | the offlining failed. |
| 44 | Reading the file is not allowed. |