Virtual Machine time accounting
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Cover letter [PATCH/RFC 0/4]Virtual Machine time accounting
The aim of these four patches is to introduce Virtual Machine time accounting.
[PATCH 1/4] as modern CPUs introduce a third running state, after "user" and "system", we need a new field, "guest", in cpustat to store the time used by the CPU to run virtual CPU. Modify /proc/stat to display this new field.
[PATCH 2/4] like for cpustat, introduce the "guest" and "cguest" fields for the tasks. Modify signal_struct and task_struct. Modify /proc/<pid>/stat to display these new field
[PATCH 3/3] introduce "account modifiers" mechanism in the kernel allowing a module to modify the collected accounting for a given task. This implementation is based on the "preempt_notifier". "account_system_time()" and "account_user_time()" can call functions registered by a module to modify the cputime value.
[PATCH 4/4] Modify KVM to use the "account modifiers". KVM can now measure time consumed by a Virtual Machine on a per-cpu basis and modify kernel statistics to report this value.
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