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| author | Andi Kleen <ak@linux.intel.com> | 2015-06-24 16:56:02 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-06-24 17:49:41 -0700 |
| commit | e0de78dfb4655752897d123a8cce6ecab4175dc9 (patch) | |
| tree | 47a221a7054d0ff08895bb8aad55ff7940d2efe9 /mm/memory-failure.c | |
| parent | 1ed58b6051b67e5cfe9e465fb60bf7d5f55e0a64 (diff) | |
| download | op-kernel-dev-e0de78dfb4655752897d123a8cce6ecab4175dc9.zip op-kernel-dev-e0de78dfb4655752897d123a8cce6ecab4175dc9.tar.gz | |
mm, hwpoison: add comment describing when to add new cases
Here's another comment fix for hwpoison.
It describes the "guiding principle" on when to add new
memory error recovery code.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Acked-by: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memory-failure.c')
| -rw-r--r-- | mm/memory-failure.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/mm/memory-failure.c b/mm/memory-failure.c index 501820c..dfa9dd7 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -20,6 +20,14 @@ * this code has to be extremely careful. Generally it tries to use * normal locking rules, as in get the standard locks, even if that means * the error handling takes potentially a long time. + * + * It can be very tempting to add handling for obscure cases here. + * In general any code for handling new cases should only be added iff: + * - You know how to test it. + * - You have a test that can be added to mce-test + * https://git.kernel.org/cgit/utils/cpu/mce/mce-test.git/ + * - The case actually shows up as a frequent (top 10) page state in + * tools/vm/page-types when running a real workload. * * There are several operations here with exponential complexity because * of unsuitable VM data structures. For example the operation to map back |
