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freebsd-skq/sys/amd64/include
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rwatson abf6ea2973 Add an "options MP_WATCHDOG" to i386. This option allows one of the 
logical CPUs on a system to be used as a dedicated watchdog to cause a
drop to the debugger and/or generate an NMI to the boot processor if
the kernel ceases to respond.  A sysctl enables the watchdog running
out of the processor's idle thread; a callout is launched to reset a
timer in the watchdog.  If the callout fails to reset the timer for ten
seconds, the watchdog will fire.  The sysctl allows you to select which
CPU will run the watchdog.

A sample "debug.leak_schedlock" is included, which causes a sysctl to
spin holding sched_lock in order to trigger the watchdog.  On my Xeons,
the watchdog is able to detect this failure mode and break into the
debugger, which cannot otherwise be done without an NMI button.

This option does not currently work with sched_ule due to ule's push
notion of scheduling, similar to machdep.hlt_logical_cpus failing to
work with that scheduler.

On face value, this might seem somewhat inefficient, but there are a
lot of dual-processor Xeons with HTT around, so using one as a watchdog
for testing is not as inefficient as one might fear.
2004-08-15 18:02:09 +00:00
..
pc - Use the correct devclass name ("acpi" vs "ACPI") to detect if acpi0 is 2004-06-10 20:43:04 +00:00
_inttypes.h
_limits.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
_stdint.h <stdint.h> should define WINT_M{AX,IN} independent from whether WCHAR_MIN is 2004-05-18 16:04:57 +00:00
_types.h Introduce the cpumask_t type. The purpose of the type is to create a 2004-03-20 20:41:40 +00:00
acpica_machdep.h Add an MI implementation of the ACPI global lock routines and retire the 2004-05-05 20:04:14 +00:00
apicreg.h
apicvar.h MFi386: various io apic cleanups 2004-07-08 01:42:49 +00:00
asm.h Argh. Add the mini-stack-frame back in for mcount's benefit for syscall 2004-06-10 22:02:26 +00:00
asmacros.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
atomic.h
bus_amd64.h
bus_dma.h
bus_memio.h
bus_pio.h
bus.h
clock.h
cpu.h Instead of calling ia32_pause() conditionally on __i386__ or __amd64__ 2004-08-03 18:44:27 +00:00
cpufunc.h MFia64: 2004-07-30 16:44:29 +00:00
cputypes.h MFi386: move cpu_nameclass struct next to its only consumer 2004-06-03 20:18:15 +00:00
critical.h Pass a thread argument into cpu_critical_{enter,exit}() rather than 2004-07-27 16:41:01 +00:00
db_machdep.h Mega update for the KDB framework: turn DDB into a KDB backend. 2004-07-10 23:47:20 +00:00
elf.h Add style(9) foolishness. 2004-08-03 08:21:48 +00:00
endian.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
exec.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
float.h Make FLT_ROUNDS correctly reflect the dynamic rounding mode. 2004-07-19 08:17:25 +00:00
floatingpoint.h
fpu.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
frame.h Remove obsolete prototype of kdb_trap(). 2004-07-10 22:39:56 +00:00
gdb_machdep.h Introduce the GDB debugger backend for the new KDB framework. The 2004-07-10 17:47:22 +00:00
ieeefp.h
in_cksum.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
intr_machdep.h MFi386: numerous interrupt and acpi updates 2004-05-16 20:30:47 +00:00
iodev.h Break out the MI part of the /dev/[k]mem and /dev/io drivers into 2004-08-01 11:40:54 +00:00
kdb.h Introduce the KDB debugger frontend. The frontend provides a framework 2004-07-10 18:40:12 +00:00
legacyvar.h MFi386: numerous interrupt and acpi updates 2004-05-16 20:30:47 +00:00
limits.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
md_var.h Remove atdevbase and replace it's remaining uses with direct references to 2004-06-10 20:31:00 +00:00
memdev.h Break out the MI part of the /dev/[k]mem and /dev/io drivers into 2004-08-01 11:40:54 +00:00
metadata.h
mp_watchdog.h Add an "options MP_WATCHDOG" to i386. This option allows one of the 2004-08-15 18:02:09 +00:00
mptable.h
mutex.h
param.h Turn off PREEMPTION by default while it gets debugged. It's been causing 2004-08-01 14:31:45 +00:00
pcb_ext.h
pcb.h Implement makectx(). The makectx() function is used by KDB to create 2004-07-10 19:56:00 +00:00
pci_cfgreg.h MFi386: nuke pci_cfgintr 2004-03-13 19:19:13 +00:00
pcpu.h
pmap.h Remove the allpmaps list. It's unused. 2004-07-20 02:40:56 +00:00
proc.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
profile.h Use newly added __used attribute to keep static function symbol from 2004-07-29 18:02:28 +00:00
psl.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
ptrace.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
reg.h Remove advertising clause from University of California Regent's license, 2004-04-05 23:55:14 +00:00
reloc.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
resource.h
runq.h
segments.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
setjmp.h
sf_buf.h Simplify the sf_buf implementation. In short, make it a trivial veneer 2004-04-18 05:36:37 +00:00
sigframe.h
signal.h Remove advertising clause from University of California Regent's license, 2004-04-05 23:55:14 +00:00
smp.h Kill the LAZYPMAP ifdefs. While they worked, they didn't do anything 2004-05-16 22:11:50 +00:00
specialreg.h Initial PG_NX support (no-execute page bit) 2004-06-08 01:02:52 +00:00
stdarg.h
sysarch.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
trap.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
tss.h Remove advertising clause from University of California Regent's license, 2004-04-05 21:29:41 +00:00
ucontext.h
varargs.h
vmparam.h