Unit Instance

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        "A large percentage of page faults that occur are zero-fill faults.  You can usually see this by observing the `vmstat -s` output.  These occur when a process accesses pages in its BSS area.  The BSS area is expected to be initially zero but the VM system does not bother to allocate any memory at all until the process actually accesses it.  When a fault occurs the VM system must not only allocate a new page, it must zero it as well.  To optimize the zeroing operation the VM system has the ability to pre-zero pages and mark them as such, and to request pre-zeroed pages when zero-fill faults occur.  The pre-zeroing occurs whenever the CPU is idle but the number of pages the system pre-zeros is limited to avoid blowing away the memory caches.  This is an excellent example of adding complexity to the VM system to optimize the critical path."
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