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