This file is indexed.

/etc/default/ksm is in ksmtuned 4.20150325.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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# The maximum number of unswappable kernel pages
# which may be allocated by ksm (0 for unlimited)
# If unset, defaults to half of total memory
# KSM_MAX_KERNEL_PAGES=