Documentation/vm/transhuge.txt: add information about max_ptes_swap
authorEbru Akagunduz <ebru.akagunduz@gmail.com>
Fri, 6 Nov 2015 02:47:32 +0000 (18:47 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Fri, 6 Nov 2015 03:34:48 +0000 (19:34 -0800)
commit80f73b4b71f767f7fcd85f68be18af7795904484
treeaef70a488868e4d169e5c2bdc9f18ce1ef8b0346
parent3608de0787e51d3d826656e105524b48ade7b16f
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@gmail.com>
Acked-by: Rik van Riel <riel@redhat.com>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Documentation/vm/transhuge.txt