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2016-12-07buildstats: reduce amount of data stored for system utilizationPatrick Ohly
Pre-processing /proc data during the build considerably reduces the amount of data written to disk: 176KB instead of 4.7MB for a 20 minuted build. Parsing also becomes faster. The disk monitor log added another 16KB in that example build. The overall buildstat was 20MB, so the overhead for monitoring system utilization is small enough that it can be enabled by default. Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
2016-12-07buildstats: record disk space usagePatrick Ohly
Hooks into the new monitordisk.py event and records the used space for each volume. That is probably the only relevant value when it comes to visualizing the build and recording more would only increase disk usage. Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
2016-12-07buildstats: add system state samplingPatrick Ohly
/proc/[diskstats|meminfo|stat] get sampled and written to the same proc_<filename>.log files as during normal bootchat logging. This will allow rendering the CPU, disk and memory usage charts. Right now sampling happens once a second, triggered by the heartbeat event.That produces quite a bit of data for long builds, which will be addressed in a separate commit by storing the data in a more compact form. Signed-off-by: Patrick Ohly <patrick.ohly@intel.com> Signed-off-by: Ross Burton <ross.burton@intel.com>