2048 Latency Virtualization 
Brendan Gregg
AUGUST 18, 2019
For example, iostat(1), or a monitoring agent, may tell you your average disk latency, but not the distribution of this latency. For smaller environments, it can be of more use helping eliminate latency outliers. bpftrace uses BPF (Berkeley Packet Filter), an in-kernel execution engine that processes a virtual instruction set.
SQL Server According to Bob
JANUARY 11, 2020
The caching of data pages and grouping of log records helps remove much, if not all, of the command latency associated with a write operation. The following table outlines the virtual protection states. Page State Virtual Protection State Dirty Read Write during the modification.
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