On 08/19/2009 03:53 PM, Ryota Ozaki wrote:
Hi, This patch let kvm exposes per-vm statistics about such as the total number of vm exits, via debugfs. Existing kvm already collects the per-vm statistics, but it has no interface to expose them to users. This patch creates directories named a pid of the corresponding vm in debugfs of kvm, containing the same files that original debugfs exposes. The per-vm statistics are useful to know activities of vms (and to identify anomalous vms for example) with more detailed information than cpu and memory usage, and network traffics. And also the patch introduces no performance overhead, thus, it should be familiar with online operations, e.g., dynamic adaptation of assigning vm resources using the statistics. Note that this patch requires a trivial modification to kvm_stat script. Once this patch is accepted I will send a patch for it. Thanks, ozaki-r
My plan is to completely remove the current statistics in favour of tracepoints. You can already display tracepoint statistics with 'perf stat' (see tools/perf); tracepoints have the advantage that they can be completely disabled at runtime and thus have no performance impact.
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