[oe-commits] Beth Flanagan : buildstats.bbclass: Adding disk io measurement

[git version control]

Module: openembedded-core.git
Branch: master
Commit: eeebcebf0d695358e72f3aed753f66cddd5e0e61
URL:    http://git.openembedded.org/?p=openembedded-core.git&a=commit;h=eeebcebf0d695358e72f3aed753f66cddd5e0e61

Author: Beth Flanagan <elizabeth.flanagan at intel.com>
Date:   Wed Aug  3 12:31:08 2011 -0700

buildstats.bbclass: Adding disk io measurement

This commit adds disk-io statistics functionality on a build
and per-task basis.

It pulls measurements for whatever partition TMPDIR exists on.
This data could be off if SSTATE_DIR and DL_DIR exist on
a different partition/volume.

Notes on what this pulls:

ReadsComp: Total number of reads complete
ReadsMerged: Total number of adjacent reads merged
SectRead: Total number of sectors read
TimeReads: Total number of m/s spent reading
WritesComp: Total number of writes completed
SectWrite: Total number of sectors written
TimeWrite: Total number of m/s spent writing
IOinProgress: Total amount of IO in progress at the time of
              we look at /proc/diskstats.
TimeIO: Total number of m/s spent doing IO
WTimeIO: Weighted time doing I/O. From iostats.txt:

"This field is incremented at each I/O start, I/O completion, I/O
 merge, or read of these stats by the number of I/Os in progress
 (field 9) times the number of milliseconds spent doing I/O since the
 last update of this field.  This can provide an easy measure of both
 I/O completion time and the backlog that may be accumulating."

Signed-off-by: Beth Flanagan <elizabeth.flanagan at intel.com>

---

 meta/classes/buildstats.bbclass |  220 +++++++++++++++++++++++++--------------
 1 files changed, 142 insertions(+), 78 deletions(-)

Diff:   http://git.openembedded.org/?p=openembedded-core.git/?a=commitdiff;h=eeebcebf0d695358e72f3aed753f66cddd5e0e61