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Date: Fri, 18 Sep 2015 00:34:58 +0300 From: Ebru Akagunduz <ebru.akagunduz@...il.com> To: linux-mm@...ck.org Cc: riel@...hat.com, akpm@...ux-foundation.org, rientjes@...gle.com, oleg@...hat.com, kirill.shutemov@...ux.intel.com, dave@...olabs.net, denc716@...il.com, ldufour@...ux.vnet.ibm.com, sasha.levin@...cle.com, viro@...iv.linux.org.uk, linux-kernel@...r.kernel.org, Ebru Akagunduz <ebru.akagunduz@...il.com> Subject: [PATCH] doc: 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@...il.com> --- Documentation/vm/transhuge.txt | 10 ++++++++++ 1 file changed, 10 insertions(+) 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 -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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