On Tue, Aug 25, 2015 at 05:06:33PM +0200, Michal Hocko wrote:

On Tue 25-08-15 22:01:31, Yaowei Bai wrote:

quoted

Every zone's protection is calculated from managed_pages not
present_pages, to avoid misleading, correct it.

This can be folded in to your previous patch
http://marc.info/?l=linux-mm&m=144023106610358&w=2

OK, thanks.

quoted

Signed-off-by: Yaowei Bai <redacted>
---
 Documentation/sysctl/vm.txt | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/Documentation/sysctl/vm.txt b/Documentation/sysctl/vm.txt
index 9832ec5..1739b31 100644
--- a/Documentation/sysctl/vm.txt
+++ b/Documentation/sysctl/vm.txt

@@ -349,7 +349,7 @@ zone[i]'s protection[j] is calculated by following expression.
 
 (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_ratio[i] are
     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.

-- 
1.9.1


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Michal Hocko
SUSE Labs

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