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throtling mirror device is becoming useless with faster CPUS,
as way to many data can be transferred before throttling steps-in.
So prefer using dm-delay for test and keep throttling as fallback.
Fix commit 847f1dd99c
"device_id: rewrite validation of devname entries"
which began calling device_ids_refresh() in cases where it
was unnecessary, leading to extra PV searches and warnings.
Specifically, a command like "lvs <vg>" would use the hints
file to scan only devices for the named VG. This means that
scanning other PVs would be skipped, and device IDs of those
PVs could not be validated because there are no PVID values
to verify. This missing info would cause messages about
the missing info, and would cause device_ids_refresh to
search for the PVs that had been intentionally skipped.
Detection of how the command is supposed to behave actually depends on
the configure.h compilation and whether binary is compiled with
HAVE_BLKID_SUBLKS_FSINFO.
This makes it somewhat complicated in a way how to recognize which
behavior is expected.
Currently we can eventually recognize by checking error output
of some 'random' lvresize command and see if the --fs checksize is
actually recognized and rejected. If this changes - test needs
to be updated.
After umout we may race with system udevd rule - so
just retry once again after 1s sleep - that should be
enough - otherwise we would need some loop here...
Multi-line echo command are problemat across variety of bash version
and may have produce shorter results.
Convert to stable heredoc string with 'tab' skipping <<- for better
formating.
Since we now push more data into journal, parser reading this file
for --continue mode need to be adapted.
Also properly align batch mode with '.' for max test length name.
This is mainly useful in internal testing - but keep sysfs dir also
passed to filter.
Also drop use of static variable within sysfs filter and base whole
config at creation time.
Restore fsync() call For more accurate tracking by buildbot.
Try different rather tricky way of static_cast to use
already opened FD instead of seperate open(),fsync(),close().
It's pretty strange there is no way to enforce fsync() for
C++ iostreams. Flush() is actully not equal.
Add Timespec class to increase time resolution to miliseconds
(can switch to microseconds if ever needed).
Use more const and const_interators and pass by reference.
Output rusage also to list result file.
Reduce inlining of C++ constructors.
If the system changes, locate PVs that appear on different devices,
and update the device IDs in the devices file. A system change is
detected by saving the DMI product_uuid or hostname in the devices
file, and comparing it to the current system value. If a root PV
is restored or copied to a new system with different devices, then
the product_uuid or hostname should change, and trigger lvm to
locate PVIDs from system.devices on new devices.
When exit on file is present in a system and term/break signal is
catched, them dmeventd is no longger refusing to exit.
For the correct shutdown, there should be ideally unmonitoring call,
however in some case it's very hard to implement this correct procedure.
With this 'exit on' file dmeventd at least avoid 'blocking' shutdown,
before systemd kills use with -9 anyway possibly even in some unwanted
stated of internal dmeventd processing (i.e. in the middle of some lvm
command processing).
To quickly get info about some internal dmeventd status,
implment 'dmeventd -i' support.
Reported messages are some 'raw' internal informations mainly
useful to developers.
Instead of just exiting in the middle of monitoring,
unregisted all monitored devices first and then exit.
To speedup this path, all send internal SIGINT when thread
unregiters itself, to wakup-up main sleeping loop.
