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| author | Ebru Akagunduz <ebru.akagunduz@gmail.com> | 2015-02-26 23:34:36 +0200 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2015-03-20 07:41:55 -0600 |
| commit | 9ddfa69fb073081882505a4f69d3f0c344d9bcaf (patch) | |
| tree | b4f3b523268b2f0fca2288ee6f259576521e73a4 /Documentation/vm | |
| parent | d0724961552f2b7da89e4b822b985f3c9fd13b79 (diff) | |
| download | linux-9ddfa69fb073081882505a4f69d3f0c344d9bcaf.tar.gz linux-9ddfa69fb073081882505a4f69d3f0c344d9bcaf.tar.bz2 linux-9ddfa69fb073081882505a4f69d3f0c344d9bcaf.zip | |
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/vm')
| -rw-r--r-- | Documentation/vm/transhuge.txt | 11 |
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 |