On 10/24/2012 01:19 PM, Ni zhan Chen wrote:
Hi all,
I have some questions about ksm.
1) khugepaged default nice value is 19, but ksmd default nice value is
5, why this big different?
2) why ksm doesn't support pagecache and tmpfs now? What's the
bottleneck?
3) ksm kernel doc said that "KSM only merges anonymous(private) pages,
never pagecache(file) pages". But where judege it should be private?
4) ksm kernel doc said that "To avoid the instability and the
resulting false negatives to be permanent, KSM re-initializes the
unstable tree root node to an empty tree, at every KSM pass." But I
can't find where re-initializes the unstable tree, could you explain me?
in scan_get_next_rmap_item(), if (slot == &ksm_mm_head) then we do
root_unstable_tree = RB_ROOT; this will result in root_unstable_tree
being empty.
Thanks in advance. :-)
Regards,
Chen
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