====== Kernel SamePage Merging (KSM) ======
Azaz memória deduplikáció

  * http://ham.to/?p=15
  * http://v-kompany.blogspot.hu/2014/07/ksmkernel-samepage-merging.html


===== Engedélyezés =====
<code bash>echo 1 > /sys/kernel/mm/ksm/run</code>


===== Proc fájlok leírása =====
<blockquote>
The effectiveness of //KSM// and //MADV_MERGEABLE// is shown in ''/sys/kernel/mm/ksm/'':

^ ''pages_shared'' | how many shared unswappable kernel pages KSM is using |
^ ''pages_sharing'' | how many more sites are sharing them i.e. how much saved |
^ ''pages_unshared'' | how many pages unique but repeatedly checked for merging |
^ ''pages_volatile'' | how many pages changing too fast to be placed in a tree |
^ ''full_scans'' | how many times all mergeable areas have been scanned |

  * A high ratio of ''pages_sharing'' to ''pages_shared'' indicates good sharing, but a high ratio of ''pages_unshared'' to ''pages_sharing'' indicates wasted effort.
  * ''pages_volatile'' embraces several different kinds of activity, but a high proportion there would also indicate poor use of madvise //MADV_MERGEABLE//.
</blockquote>