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Subjectfree page zeroing and ksm
Hi all,

working a lot with KVM and KSM I came across the question if Linux (like
e.g. Windows) zeroes out free pages
after usage. I came across some patches for page sanitization which
where submitted in 2009 and have not
been merged for various reasons.

Working with memory deduplication the primary goal is not sanitization
of the pages, but have them not contain
any garbage after they are freed.

My question is if there is any mechanism in Linux to zero out unused
pages? I found some people claiming that
there is such a mechanism, but I found no reference.

If there is not would it be possible to implement a kernel process that
scans for unused pages and zeroes them
out during idle time?


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