From: Ebru Akagunduz Date: Fri, 6 Nov 2015 02:47:32 +0000 (-0800) Subject: Documentation/vm/transhuge.txt: add information about max_ptes_swap X-Git-Tag: v4.9.8~3261^2~82 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=80f73b4b71f767f7fcd85f68be18af7795904484;p=platform%2Fkernel%2Flinux-rpi3.git 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 Acked-by: Rik van Riel Acked-by: David Rientjes Cc: Oleg Nesterov Cc: Kirill A. Shutemov Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/Documentation/vm/transhuge.txt b/Documentation/vm/transhuge.txt index 8143b9e..8a28268 100644 --- a/Documentation/vm/transhuge.txt +++ b/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