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HWPOISON: add fs/device filters

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Filesystem data/metadata present the most tricky-to-isolate pages.
It requires careful code review and stress testing to get them right.

The fs/device filter helps to target the stress tests to some specific
filesystem pages. The filter condition is block device's major/minor
numbers:
        - corrupt-filter-dev-major
        - corrupt-filter-dev-minor
When specified (non -1), only page cache pages that belong to that
device will be poisoned.

The filters are checked reliably on the locked and refcounted page.

Haicheng: clear PG_hwpoison and drop bad page count if filter not OK
AK: Add documentation

CC: Haicheng Li <[email protected]>
CC: Nick Piggin <[email protected]>
Signed-off-by: Wu Fengguang <[email protected]>
Signed-off-by: Andi Kleen <[email protected]>
This commit is contained in:
Wu Fengguang 2009-12-16 12:19:59 +01:00 • committed by Andi Kleen
commit 7c116f2b0d
4 changed files with 72 additions and 0 deletions
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7
Documentation/vm/hwpoison.txt
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@ -115,6 +115,13 @@ memory failures.
Note these injection interfaces are not stable and might change between
kernel versions
corrupt-filter-dev-major
corrupt-filter-dev-minor
Only handle memory failures to pages associated with the file system defined
by block device major/minor. -1U is the wildcard value.
This should be only used for testing with artificial injection.
Architecture specific MCE injector
x86 has mce-inject, mce-test