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authorEbru Akagunduz <ebru.akagunduz@gmail.com>2015-02-26 23:34:36 +0200
committerJonathan Corbet <corbet@lwn.net>2015-03-20 07:41:55 -0600
commit9ddfa69fb073081882505a4f69d3f0c344d9bcaf (patch)
treeb4f3b523268b2f0fca2288ee6f259576521e73a4 /Documentation
parentd0724961552f2b7da89e4b822b985f3c9fd13b79 (diff)
doc: add information about max_ptes_none
max_ptes_none specifies how many extra small pages (that are not already mapped) can be allocated when collapsing a group of small pages into one large page. /sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_none A higher value leads to use additional memory for programs. A lower value leads to gain less thp performance. Value of max_ptes_none can waste cpu time very little, you can ignore it. Signed-off-by: Ebru Akagunduz <ebru.akagunduz@gmail.com> Reviewed-by: Rik van Riel <riel@redhat.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/vm/transhuge.txt11
1 files changed, 11 insertions, 0 deletions
diff --git a/Documentation/vm/transhuge.txt b/Documentation/vm/transhuge.txt
index 6b31cfbe2a9a..8143b9e8373d 100644
--- a/Documentation/vm/transhuge.txt
+++ b/Documentation/vm/transhuge.txt
@@ -159,6 +159,17 @@ for each pass:
/sys/kernel/mm/transparent_hugepage/khugepaged/full_scans
+max_ptes_none specifies how many extra small pages (that are
+not already mapped) can be allocated when collapsing a group
+of small pages into one large page.
+
+/sys/kernel/mm/transparent_hugepage/khugepaged/max_ptes_none
+
+A higher value leads to use additional memory for programs.
+A lower value leads to gain less thp performance. Value of
+max_ptes_none can waste cpu time very little, you can
+ignore it.
+
== Boot parameter ==
You can change the sysfs boot time defaults of Transparent Hugepage