KSM: Mark new vma for deduplication

Good time of day List,
this tiny series of patches implement feature for auto deduping all anonymous memory.
mark_new_vma - new ksm sysfs interface
Every time then new vma created and mark_new_vma set to 1, then will be vma marked as VM_MERGEABLE and added to ksm queue. This can produce small overheads
(I have not catch any problems or slowdown)

This is useful for:
Android (CM) devs which implement ksm support with patching system. Users of tiny pc.
Servers what not use KVM but use something very releated, like containers.

Can be pulled from:
https://github.com/Nefelim4ag/linux.git ksm_improvements

For tests:
I have tested it and it working very good. For testing apply it and enable ksm:
echo 1 | sudo tee /sys/kernel/mm/ksm/run
This show how much memory saved:
echo $[$(cat /sys/kernel/mm/ksm/pages_shared)*$(getconf PAGE_SIZE)/1024 ]KB

On my system i save ~1% of memory 26 Mb/2100 Mb (deduped)/(used)

v2:
Added Kconfig for control default value of mark_new_vma Added sysfs interface for control mark_new_vma Splitted in several patches

v3:
Documentation for ksm changed for clarify new cha

Timofey Titovets (4):
KSM: Add auto flag new VMA as VM_MERGEABLE
KSM: Add to sysfs - mark_new_vma
KSM: Add config to control mark_new_vma
KSM: mark_new_vma added to Documentation.

 Documentation/vm/ksm.txt |  7 +++++++
 include/linux/ksm.h      | 39 +++++++++++++++++++++++++++++++++++++++
 mm/Kconfig               |  7 +++++++
 mm/ksm.c                 | 39 ++++++++++++++++++++++++++++++++++++++-
 mm/mmap.c                | 17 +++++++++++++++++
 5 files changed, 108 insertions(+), 1 deletion(-)

2.1.3

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