Merge from head

IFC @ r255209

Fix bug in r253719: fix command line watchdog disable.

r253719 disallowed watchdog(8) from disabling the watchdog
by breaking the ability to pass 0 as a timeout arg. Fix this.

IFC @ r254014

IFC @ r253862

- change the SI_SUB_RUN_SCHEDULER sysinits in hv_utilc and
hv_netvsc_drv_freebsd.c to SI_SUB_KTHREAD_IDLE, since the
former is no longer in FreeBSD.
The use of these SYSINITs can pro

IFC @ r253862

- change the SI_SUB_RUN_SCHEDULER sysinits in hv_utilc and
hv_netvsc_drv_freebsd.c to SI_SUB_KTHREAD_IDLE, since the
former is no longer in FreeBSD.
The use of these SYSINITs can probably be removed.

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Apply a casting sledgehammer.

Submitted by: dhw

Fix printf of seconds for systems where time_t is 64 bits.

Fix watchdog pretimeout.

The original API calls for pow2ns, however the new APIs from
Linux call for seconds.

We need to be able to convert to/from 2^Nns to seconds in both
userland and kernel to f

Fix watchdog pretimeout.

The original API calls for pow2ns, however the new APIs from
Linux call for seconds.

We need to be able to convert to/from 2^Nns to seconds in both
userland and kernel to fix this and properly compare units.

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IFC @253398

Merge fresh head.

sync from head

Mark the act_tbl static/const.

This table is only used within this source file and is only accessed
read-only.

MFC after: 1 week

Invert the meaning of -S (added in r247405) and document its meaning. Also,
don't carp about the watchdog command taking too long until after the
watchdog has been patted, and don't carp via warnx(3)

Invert the meaning of -S (added in r247405) and document its meaning. Also,
don't carp about the watchdog command taking too long until after the
watchdog has been patted, and don't carp via warnx(3) unless -S is set
since syslog(3) already logs to standard error otherwise.

Discussed with: alfred
Reviewed by: alfred
Approved by: emaste (co-mentor)

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watchdogd(8) and watchdog(4) enhancements.

The following support was added to watchdog(4):
- Support to query the outstanding timeout.
- Support to set a software pre-timeout function watchdog with

watchdogd(8) and watchdog(4) enhancements.

The following support was added to watchdog(4):
- Support to query the outstanding timeout.
- Support to set a software pre-timeout function watchdog with an 'action'
- Support to set a software only watchdog with a configurable 'action'

'action' can be a mask specifying a single operation or a combination of:
log(9), printf(9), panic(9) and/or kdb_enter(9).

Support the following in watchdogged:
- Support to utilize the new additions to watchdog(4).
- Support to warn if a watchdog script runs for too long.
- Support for "dry run" where we do not actually arm the watchdog,
but only report on our timing.

Sponsored by: iXsystems, Inc.
MFC after: 1 month

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IFC @247348.

Sync with HEAD.

Revert accidental regression to previous misspelling.

Approved by: cognet (mentor)

Reduce watchdogd's memory footprint when running daemonized.

This uses the recently-added jemalloc(3) feature of setting the lg_chunk
tuning option to zero to request that memory be allocated in the

Reduce watchdogd's memory footprint when running daemonized.

This uses the recently-added jemalloc(3) feature of setting the lg_chunk
tuning option to zero to request that memory be allocated in the smallest
chunks possible. Without this option, the default is to initally map 8MB,
and then the mlockall() call wires that entire allocation even though the
program only uses a few Kbytes of it at runtime.

PR: bin/173332
Approved by: cognet (mentor)

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Spelling: exitting -> exiting

MFC after: 2 weeks

MFC

MFC @ r241285

IFC @ r242684

Sync from head

Replace log(3) with flsll(3) for watchdogd(8) and drop libm dependency.

MFC after: 2 weeks

Merge head r233826 through r240095.