Ebru Akagunduz 8a966ed746 mm: make swapin readahead to improve thp collapse rate ... This patch makes swapin readahead to improve thp collapse rate. When khugepaged scanned pages, there can be a few of the pages in swap area. With the patch THP can collapse 4kB pages into a THP when there are up to max_ptes_swap swap ptes in a 2MB range. The patch was tested with a test program that allocates 400B of memory, writes to it, and then sleeps. I force the system to swap out all. Afterwards, the test program touches the area by writing, it skips a page in each 20 pages of the area. Without the patch, system did not swap in readahead. THP rate was %65 of the program of the memory, it did not change over time. With this patch, after 10 minutes of waiting khugepaged had collapsed %99 of the program's memory. [kirill.shutemov@linux.intel.com: trivial cleanup of exit path of the function] [kirill.shutemov@linux.intel.com: __collapse_huge_page_swapin(): drop unused 'pte' parameter] [kirill.shutemov@linux.intel.com: do not hold anon_vma lock during swap in] Signed-off-by: Ebru Akagunduz <ebru.akagunduz@gmail.com> Acked-by: Rik van Riel <riel@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: Xie XiuQi <xiexiuqi@huawei.com> Cc: Cyrill Gorcunov <gorcunov@openvz.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: David Rientjes <rientjes@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Cc: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Cc: Hugh Dickins <hughd@google.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Signed-off-by: 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>		2016-07-26 16:19:19 -07:00
..
acpi	Revert "ACPI 2.0 / AML: Improve module level execution by moving the If/Else/While execution to per-table basis"	2016-07-11 16:21:08 +02:00
asm-generic	mm/mmu_gather: track page size with mmu gather and force flush if page size change	2016-07-26 16:19:19 -07:00
clocksource	clocksource/drivers/sp804: Convert init function to return error	2016-06-28 10:19:30 +02:00
crypto
drm	Merge branch 'drm-vmwgfx-fixes' of git://people.freedesktop.org/~syeh/repos_linux into drm-fixes	2016-07-15 13:51:55 +10:00
dt-bindings
keys
kvm	arm64: KVM: fix build with CONFIG_ARM_PMU disabled	2016-06-27 12:55:51 +02:00
linux	mm, memcg: use consistent gfp flags during readahead	2016-07-26 16:19:19 -07:00
math-emu
media	Update my main e-mails at the Kernel tree	2016-06-15 15:35:37 -10:00
memory
misc
net	net: switchdev: change ageing_time type to clock_t	2016-07-19 16:49:20 -07:00
pcmcia
ras
rdma	IB/rdmavt: Correct qp_priv_alloc() return value test	2016-06-23 10:16:15 -04:00
rxrpc
scsi
soc	Revert "usb: ohci-at91: Forcibly suspend ports while USB suspend"	2016-06-20 07:42:07 -07:00
sound
target
trace	mm: make swapin readahead to improve thp collapse rate	2016-07-26 16:19:19 -07:00
uapi	zsmalloc: page migration support	2016-07-26 16:19:19 -07:00
video
xen
Kbuild