The patch titled
Subject: Documentation: clarify in calculating zone protection
has been added to the -mm tree. Its filename is
mm-page_alloc-fix-a-terrible-misleading-comment-fix.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-fix-a-terrible-misleading-comment-fix.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-fix-a-terrible-misleading-comment-fix.patch
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------------------------------------------------------
From: Yaowei Bai <bywxiaobai@xxxxxxx>
Subject: Documentation: clarify in calculating zone protection
Every zone's protection is calculated from managed_pages not
present_pages, to avoid misleading, correct it.
Signed-off-by: Yaowei Bai <bywxiaobai@xxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/sysctl/vm.txt | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN Documentation/sysctl/vm.txt~mm-page_alloc-fix-a-terrible-misleading-comment-fix Documentation/sysctl/vm.txt
--- a/Documentation/sysctl/vm.txt~mm-page_alloc-fix-a-terrible-misleading-comment-fix
+++ a/Documentation/sysctl/vm.txt
@@ -349,7 +349,7 @@ zone[i]'s protection[j] is calculated by
(i < j):
zone[i]->protection[j]
- = (total sums of present_pages from zone[i+1] to zone[j] on the node)
+ = (total sums of managed_pages from zone[i+1] to zone[j] on the node)
/ lowmem_reserve_ratio[i];
(i = j):
(should not be protected. = 0;
@@ -360,7 +360,7 @@ The default values of lowmem_reserve_rat
256 (if zone[i] means DMA or DMA32 zone)
32 (others).
As above expression, they are reciprocal number of ratio.
-256 means 1/256. # of protection pages becomes about "0.39%" of total present
+256 means 1/256. # of protection pages becomes about "0.39%" of total managed
pages of higher zones on the node.
If you would like to protect more pages, smaller values are effective.
_
Patches currently in -mm which might be from bywxiaobai@xxxxxxx are
mm-page_alloc-fix-a-terrible-misleading-comment.patch
mm-page_alloc-fix-a-terrible-misleading-comment-fix.patch
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