[RFC PATCH 0/1] ksm allow dedup all process memory

[Timofey Titovets <nefelim4ag@gmail.com>]

Hi, about 3 years ago i firstly write to linux-mm,
when i acking about UKSM and make some ugly patches (like that [1]).

It's difficult to find conversation (for me at least, i only find
my patches).
So IIRC:
 - I trying add support KSM to all process memory
   for that i patch several memory places to call hooks like madvise.
   MM folks not like that and at now i'm not only agree, i can fix that another way.

First i try look at hugepagesd, but hugepages have a much different usecase.
As example it's bad idea add ksm hook to page_fault.

So:
 I use kernel task list in ksm_scan_thread and add logic to allow ksm
 import VMA from tasks.
 That behaviour controlled by new attribute: mode
 I try mimic hugepages attribute, so mode have two states:
  - normal [old default behaviour]
  - always [new] - allow ksm to get tasks vma and try working on that.

To reduce CPU load & tasklist locking time, ksm try import one VMA per loop.

Patch mirror: https://github.com/Nefelim4ag/linux/commit/be6a94e171bf214a26f8186bb76b1d365ccb3b08

Thanks, any comments are appricated!

(Yes i can split patch, but it's RFC and it's too small)

1. https://lkml.org/lkml/2014/11/8/208

Timofey Titovets (1):
  ksm: allow dedup all tasks memory

 Documentation/vm/ksm.txt |   3 +
 mm/ksm.c                 | 139 ++++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 121 insertions(+), 21 deletions(-)

--
2.14.1

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>