This also involves removing zfs_zpool code for now.
Signed-Off-By: Corey Stewart <stewa169@purdue.edu>
Signed-Off-By: Joe Handzik <joseph.t.handzik@hpe.com>
This patch makes stylistic changes to error strings, unexports method names by lower casing them, removes unused dataSetMetric, and adds copyright/licence information.
Signed-Off-By: Corey Stewart <stewa169@purdue.edu>
It is tested on FreeBSD 10.2-RELEASE and Linux (ZFS on Linux 0.6.5.4).
On FreeBSD, Solaris, etc. ZFS metrics are exposed through sysctls.
ZFS on Linux exposes the same metrics through procfs `/proc/spl/...`.
In addition to sysctl metrics, 'computed metrics' are exposed by
the collector, which are based on several sysctl values.
There is some conditional logic involved in computing these metrics
which cannot be easily mapped to PromQL.
Not all 92 ARC sysctls are exposed right now but this can be changed
with one additional LOC each.
The devstat API expects us to reuse one devinfo for many invocations of
devstat_getstats. In particular, it allocates and resizes memory
referenced by devinfo.
Querying the number of devices separately from the device list itself is
racy. Devices may be added or removed between the two calls; and removed
devices would lead to a segfault.
The memory allocated by calloc was never freed. Since the devinfo struct
never leaves the function, anyway, we might as well just allocate it on
the stack.
It seems solaris prefers "sys/loadavg.h" over "stdlib.h" when
fetching the load average.
For Illumos based OSes it was required to include "sys/time.h" to
ensure that "hrtime_t" was defined.
https://www.illumos.org/issues/6002
It also required setting the ldflags "-fno-stack-protector -lssp" to
avoid undefined symbols when linking with gcc.
/opt/local/go/pkg/tool/solaris_amd64/link: running gcc failed: exit status 1
Undefined first referenced
symbol in file
__stack_chk_fail /tmp/go-link-138622936/000002.o
__stack_chk_guard /tmp/go-link-138622936/000002.o
Instead of doing the whole metric exposition in a platform specific collector
implementation, this creates and updates the metrics in meminfo.go and
expected a platform specific implementation of getMemInfo on
*meminfoCollector.
This removes some error handling, which should be fine. If the calls
fail, we will get the zeroes, which is a safe enough fallback.
Additionally, if the first sysctl (page_size) succeeded it is unlikely
that other ones will fail.
