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HWPOISON: Add unpoisoning support

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The unpoisoning interface is useful for stress testing tools to
reclaim poisoned pages (to prevent OOM)

There is no hardware level unpoisioning, so this
cannot be used for real memory errors, only for software injected errors.

Note that it may leak pages silently - those who have been removed from
LRU cache, but not isolated from page cache/swap cache at hwpoison time.
Especially the stress test of dirty swap cache pages shall reboot system
before exhausting memory.

AK: Fix comments, add documentation, add printks, rename symbol

Signed-off-by: Wu Fengguang <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
This commit is contained in:
Wu Fengguang 2009-12-16 12:19:58 +01:00 • committed by Andi Kleen
commit 847ce401df
5 changed files with 114 additions and 9 deletions
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16
Documentation/vm/hwpoison.txt
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@ -98,10 +98,22 @@ madvise(MADV_POISON, ....)
hwpoison-inject module through debugfs
/sys/debug/hwpoison/corrupt-pfn
Inject hwpoison fault at PFN echoed into this file
/sys/debug/hwpoison/
corrupt-pfn
Inject hwpoison fault at PFN echoed into this file.
unpoison-pfn
Software-unpoison page at PFN echoed into this file. This
way a page can be reused again.
This only works for Linux injected failures, not for real
memory failures.
Note these injection interfaces are not stable and might change between
kernel versions
Architecture specific MCE injector