Hi, maybe it is a stupid question, but I just couldn't figure it out, since codes of ksm in 2.6.32 and 3.10.0 are similar. In CentOS 6 (kernel 2.6.32 based), I can see ksm slab from /proc/slabinfo: $ grep ksm /proc/slabinfo ksm_mm_slot 5 77 48 77 1 : tunables 120 60 8 : slabdata 1 1 0 ksm_stable_node 414575 446016 40 92 1 : tunables 120 60 8 : slabdata 4848 4848 0 ksm_rmap_item 43617468 43617638 64 59 1 : tunables 120 60 8 : slabdata 739282 739282 0 But in CentOS 7 (kernel 3.10.0 based), they gone: $ sudo grep ksm /proc/slabinfo $ Why? ksm is compiled in kernel for both centos6 and centos7.
