The patch titled
Subject: mm, hwpoison: add comment describing when to add new cases
has been added to the -mm tree. Its filename is
mm-hwpoison-add-comment-describing-when-to-add-new-cases.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-hwpoison-add-comment-describing-when-to-add-new-cases.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-hwpoison-add-comment-describing-when-to-add-new-cases.patch
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/SubmitChecklist when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Andi Kleen <ak@xxxxxxxxxxxxxxx>
Subject: 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@xxxxxxxxxxxxxxx>
Cc: Naoya Horiguchi <n-horiguchi@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/memory-failure.c | 7 +++++++
1 file changed, 7 insertions(+)
diff -puN mm/memory-failure.c~mm-hwpoison-add-comment-describing-when-to-add-new-cases mm/memory-failure.c
--- a/mm/memory-failure.c~mm-hwpoison-add-comment-describing-when-to-add-new-cases
+++ a/mm/memory-failure.c
@@ -20,6 +20,13 @@
* 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 if:
+ * - You know how to test it.
+ * - You have a test that can be added to mce-test
+ * - 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
_
Patches currently in -mm which might be from ak@xxxxxxxxxxxxxxx are
origin.patch
mm-memory-failure-call-shake_page-when-error-hits-thp-tail-page.patch
mm-hwpoison-add-comment-describing-when-to-add-new-cases.patch
linux-next.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
--
To unsubscribe from this list: send the line "unsubscribe mm-commits" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
