The patch titled
Subject: Documentation/vm/transhuge.txt: add information about max_ptes_swap
has been added to the -mm tree. Its filename is
doc-add-information-about-max_ptes_swap.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/doc-add-information-about-max_ptes_swap.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/doc-add-information-about-max_ptes_swap.patch
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------------------------------------------------------
From: Ebru Akagunduz <ebru.akagunduz@xxxxxxxxx>
Subject: Documentation/vm/transhuge.txt: add information about max_ptes_swap
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.
Signed-off-by: Ebru Akagunduz <ebru.akagunduz@xxxxxxxxx>
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/vm/transhuge.txt | 10 ++++++++++
1 file changed, 10 insertions(+)
diff -puN Documentation/vm/transhuge.txt~doc-add-information-about-max_ptes_swap Documentation/vm/transhuge.txt
--- a/Documentation/vm/transhuge.txt~doc-add-information-about-max_ptes_swap
+++ a/Documentation/vm/transhuge.txt
@@ -170,6 +170,16 @@ A lower value leads to gain less thp per
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
_
Patches currently in -mm which might be from ebru.akagunduz@xxxxxxxxx are
mm-add-tracepoint-for-scanning-pages.patch
mm-make-optimistic-check-for-swapin-readahead.patch
mm-make-swapin-readahead-to-improve-thp-collapse-rate.patch
doc-add-information-about-max_ptes_swap.patch
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