X-Git-Url: https://gerrit.opnfv.org/gerrit/gitweb?a=blobdiff_plain;f=kernel%2FDocumentation%2Fvm%2Ftranshuge.txt;h=8a282687ee069ffc415e3c717d0991c6baf7f7fc;hb=b345dcdf3a6a7ebf19d2932e009f16fc3f51c84e;hp=8143b9e8373db41746330c468dede07acfd96b56;hpb=9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00;p=kvmfornfv.git

diff --git a/kernel/Documentation/vm/transhuge.txt b/kernel/Documentation/vm/transhuge.txt
index 8143b9e83..8a282687e 100644
--- a/kernel/Documentation/vm/transhuge.txt
+++ b/kernel/Documentation/vm/transhuge.txt
@@ -170,6 +170,16 @@ A lower value leads to gain less thp performance. Value of
 max_ptes_none can waste cpu time very little, you can
 ignore it.
 
+max_ptes_swap specifies how many pages can be brought in from
+swap when collapsing a group of pages into a transparent huge page.
+
+/sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_swap
+
+A higher value can cause excessive swap IO and waste
+memory. A lower value can prevent THPs from being
+collapsed, resulting fewer pages being collapsed into
+THPs, and lower memory access performance.
+
 == Boot parameter ==
 
 You can change the sysfs boot time defaults of Transparent Hugepage