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 granularity. 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 granularity. 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.
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