The patch titled
Documentation: correct overcommit caveat in hugetlbpage.txt
has been removed from the -mm tree. Its filename was
documentation-correct-overcommit-caveat-in-hugetlbpagetxt.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: Documentation: correct overcommit caveat in hugetlbpage.txt
From: Nishanth Aravamudan <nacc@xxxxxxxxxx>
As shown by Gurudas Pai recently, we can put hugepages into the surplus
state (by echo 0 > /proc/sys/vm/nr_hugepages), even when
/proc/sys/vm/nr_overcommit_hugepages is 0. This is actually correct, to
allow the original goal (shrink the static pool to 0) to succeed (we are
converting hugepages to surplus because they are in use). However, the
documentation does not accurately reflect this case. Update it.
Signed-off-by: Nishanth Aravamudan <nacc@xxxxxxxxxx>
Acked-by: Andy Whitcroft <apw@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/vm/hugetlbpage.txt | 7 +++----
1 file changed, 3 insertions(+), 4 deletions(-)
diff -puN Documentation/vm/hugetlbpage.txt~documentation-correct-overcommit-caveat-in-hugetlbpagetxt Documentation/vm/hugetlbpage.txt
--- a/Documentation/vm/hugetlbpage.txt~documentation-correct-overcommit-caveat-in-hugetlbpagetxt
+++ a/Documentation/vm/hugetlbpage.txt
@@ -88,10 +88,9 @@ hugepages from the buddy allocator, if t
these surplus hugepages go out of use, they are freed back to the buddy
allocator.
-Caveat: Shrinking the pool via nr_hugepages while a surplus is in effect
-will allow the number of surplus huge pages to exceed the overcommit
-value, as the pool hugepages (which must have been in use for a surplus
-hugepages to be allocated) will become surplus hugepages. As long as
+Caveat: Shrinking the pool via nr_hugepages such that it becomes less
+than the number of hugepages in use will convert the balance to surplus
+huge pages even if it would exceed the overcommit value. As long as
this condition holds, however, no more surplus huge pages will be
allowed on the system until one of the two sysctls are increased
sufficiently, or the surplus huge pages go out of use and are freed.
_
Patches currently in -mm which might be from nacc@xxxxxxxxxx are
origin.patch
mm-filter-based-on-a-nodemask-as-well-as-a-gfp_mask-make-dequeue_huge_page_vma-obey-mpol_bind-nodemask.patch
mm-filter-based-on-a-nodemask-as-well-as-a-gfp_mask-make-dequeue_huge_page_vma-obey-mpol_bind-nodemask-rework.patch
mm-fix-misleading-__gfp_repeat-related-comments.patch
page-allcoator-smarter-retry-of-costly-order-allocations.patch
page-allocator-explicitly-retry-hugepage-allocations.patch
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