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mm, hwpoison: add comment describing when to add new cases

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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>
This commit is contained in:
Andi Kleen 2015-06-24 16:56:02 -07:00 committed by Linus Torvalds
parent 1ed58b6051
commit e0de78dfb4
1 changed files with 8 additions and 0 deletions
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8
mm/memory-failure.c
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@ -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