[OE-core] [PATCH V2 00/11] system statistics sampling

[Patrick Ohly]

buildstats.bbclass gets extended so that disk bandwidth and capacity,
CPU and memory usage get sampled at regular time intervals by
default. pybootchart had code for most of that data, which gets
restored and re-enabled. The disk capacity graph is new.

The original pybootchart just stored raw dumps of the special files
under /proc. bitbake builds run longer, so a more compact ("reduced")
format is used.

Logging disk capacity was mostly motivated by some work on enhancing
rm_work.bbclass behavior, but could also be useful for others ("how
much free space did my build need").

Changes in V2:
  - SystemStats instance survives between event handler calls by
    storing it in the corresponding datastore, instead of using
    a global variable, and open files get closed properly when
    the build ends. This should work better with memres bitbake (not
    tested, though, because of YOCTO #10741).
  - Sampling now already starts when setscene tasks start to run.

The following changes since commit 9f1fe76727e98e58fc9e46ea2b49cf5c0cb48e6c:

  libpcap: Fix build when PACKAGECONFIG ipv6 is not enable (2016-11-23 11:02:33 +0000)

are available in the git repository at:

  git://github.com/pohly/openembedded-core buildstats
  https://github.com/pohly/openembedded-core/tree/buildstats

Patrick Ohly (11):
  buildstats: add system state sampling
  pybootchartgui/draw.py: allow moving process chart up and down
  pybootchartgui/draw.py: fix drawing of samples not starting at zero
  pybootchartgui: show system utilization
  pybootchartgui/draw.py: skip empty CPU and disk usage charts
  buildstats: record disk space usage
  pybootchartgui/parsing.py: fix error handling in meminfo parser
  pybootchartgui: render disk space usage
  pybootchartgui: simplify drawing of memory usage
  buildstats: reduce amount of data stored for system utilization
  pybootchartgui: support reading reduced /proc logs

 meta/classes/buildstats.bbclass                  |  24 +++
 meta/lib/buildstats.py                           | 153 ++++++++++++++++++
 scripts/pybootchartgui/pybootchartgui/draw.py    | 192 ++++++++++++++++-------
 scripts/pybootchartgui/pybootchartgui/parsing.py | 122 +++++++++++---
 scripts/pybootchartgui/pybootchartgui/samples.py |  27 ++++
 5 files changed, 440 insertions(+), 78 deletions(-)
 create mode 100644 meta/lib/buildstats.py

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2.1.4