ksm slab do not show up in /proc/slabinfo

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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.




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