pcp updates: kenj+marko merges, docs, qa

Changes committed to git://git.pcp.io/pcp.git master

Ken McDonell (4):
      src/libpcp/pdu.c: allow -EINTR to be returned from pduread()
      src/pmlogger: fix SIGINT issue
      qa/895 (new): exercise pmlogger SIGINT problem
      qa/895: small fixup

Nathan Scott (3):
      docs: fix up some minor pmdaCache(3) formatting errors
      libvirt pmda: use "::" separator for compound instance names
      qa: fix kvm test to handle added metrics from newer kernels

Marko Myllynen (1):
      libvirt pmda: add per-device metrics


 man/man3/pmdacache.3                 |    8 +-
 qa/348                               |    1 
 qa/895                               |  101 +++++++++++++++++++++++++++
 qa/895.out                           |   15 ++++
 qa/group                             |    1 
 src/libpcp/src/pdu.c                 |    9 +-
 src/pmdas/libvirt/pmdalibvirt.python |  127 ++++++++++++++++++++++++++++++++---
 src/pmlogger/src/callback.c          |    8 +-
 src/pmlogger/src/fetch.c             |    6 +
 src/pmlogger/src/pmlogger.c          |   15 +++-
 10 files changed, 267 insertions(+), 24 deletions(-)


commit cd29e18bdff86f8257f7fe9efe0c3ae8bc556bf7
Author: Nathan Scott <[email protected]>
Date:   Mon Oct 3 07:45:50 2016 +1100

    qa: fix kvm test to handle added metrics from newer kernels

commit d006dd58f08624c3ca117483a8f3088c5f67d3e6
Author: Nathan Scott <[email protected]>
Date:   Mon Oct 3 07:43:57 2016 +1100

    libvirt pmda: use "::" separator for compound instance names

commit 276aa80cd6defc296fe3cf2d8406b611b38ab929
Author: Marko Myllynen <[email protected]>
Date:   Sun Oct 2 10:43:04 2016 +1100

    libvirt pmda: add per-device metrics
    
    Support per-device metrics for VCPU/block/net devices.

commit af44284d79cc55f78f0f699201ddf40764ccbece
Author: Nathan Scott <[email protected]>
Date:   Sun Oct 2 09:20:47 2016 +1100

    docs: fix up some minor pmdaCache(3) formatting errors

commit b44536970f13a0238d6143307895de3baac71941
Author: Ken McDonell <[email protected]>
Date:   Sat Oct 1 06:55:24 2016 +1000

    qa/895: small fixup

commit 5068924eae6c9f1476806ed9d877f223ae47c432
Author: Ken McDonell <[email protected]>
Date:   Sat Oct 1 06:47:49 2016 +1000

    qa/895 (new): exercise pmlogger SIGINT problem

commit f16dcc88bbe6005a95033ba5b1d3a70d5a389796
Author: Ken McDonell <[email protected]>
Date:   Sat Oct 1 06:44:12 2016 +1000

    src/pmlogger: fix SIGINT issue
    
    Issue raised as https://github.com/performancecopilot/pcp/issues/116.
    
    This commit (and the earlier pduread() change in libpcp) fixes the
    SIGINT part of the issue ... the root trigger is fetching lots of
    metrics with a very short (10msec) update interval, which means
    there is close to a 100% guarantee that the SIGINT will interrupt
    a socket read() and the resulting error was not being propaged back
    up the call stack correctly.
    
    The mem leak part of the issue will be addressed separately.

commit bd32862bf6630c604548a0859e641ea97a75fcd2
Author: Ken McDonell <[email protected]>
Date:   Sat Oct 1 06:30:12 2016 +1000

    src/libpcp/pdu.c: allow -EINTR to be returned from pduread()
    
    If a SIGINT is received during a socket read of a PDU, we want to
    propagate -EINTR back to the caller, not PM_ERR_IPC or -1, so that
    the caller can decide what to do.


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