Marcel Moolenaar 4630415a47 Improve SMP support: ... o Allocate a VHPT per CPU. The VHPT is a hash table that the CPU uses to look up translations it can't find in the TLB. As such, the VHPT serves as a level 1 cache (the TLB being a level 0 cache) and best results are obtained when it's not shared between CPUs. The collision chain (i.e. the hash bucket) is shared between CPUs, as all buckets together constitute our collection of PTEs. To achieve this, the collision chain does not point to the first PTE in the list anymore, but to a hash bucket head structure. The head structure contains the pointer to the first PTE in the list, as well as a mutex to lock the bucket. Thus, each bucket is locked independently of each other. With at least 1024 buckets in the VHPT, this provides for sufficiently finei-grained locking to make the ssolution scalable to large SMP machines. o Add synchronisation to the lazy FP context switching. We do this with a seperate per-thread lock. On SMP machines the lazy high FP context switching without synchronisation caused inconsistent state, which resulted in a panic. Since the use of the high FP registers is not common, it's possible that races exist. The ia64 package build has proven to be a good stress test, so this will get plenty of exercise in the near future. o Don't use the local ID of the processor we want to send the IPI to as the argument to ipi_send(). use the struct pcpu pointer instead. The reason for this is that IPI delivery is unreliable. It has been observed that sending an IPI to a CPU causes it to receive a stray external interrupt. As such, we need a way to make the delivery reliable. The intended solution is to queue requests in the target CPU's per-CPU structure and use a single IPI to inform the CPU that there's a new entry in the queue. If that IPI gets lost, the CPU can check it's queue at any convenient time (such as for each clock interrupt). This also allows us to send requests to a CPU without interrupting it, if such would be beneficial. With these changes SMP is almost working. There are still some random process crashes and the machine can hang due to having the IPI lost that deals with the high FP context switch. The overhead of introducing the hash bucket head structure results in a performance degradation of about 1% for UP (extra pointer indirection). This is surprisingly small and is offset by gaining reasonably/good scalable SMP support.		2005-08-06 20:28:19 +00:00
..
pc	Remove headers copied from i386 and either useless or wrong on ia64.	2003-11-02 09:19:07 +00:00
_bus.h	Break out the definition of bus_space_{tag,handle}_t and a few other types	2005-04-18 21:45:34 +00:00
_inttypes.h
_limits.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
_regset.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +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	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
acpica_machdep.h	Move the code for halting the CPU (acpi_cpu_c1) into machdep files.	2004-10-11 05:39:15 +00:00
asm.h	nit in /*-	2005-01-31 08:16:45 +00:00
atomic.h	Convert the atomic_ptr() operations over to operating on uintptr_t	2005-07-15 18:17:59 +00:00
bootinfo.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
bus.h	Remove bus_{mem,p}io.h and related code for a micro-optimization on i386	2005-05-29 04:42:30 +00:00
bus_dma.h	Refactor the bus_dma header files so that the interface is described in	2005-03-14 16:46:28 +00:00
clock.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
cpu.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
cpufunc.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
db_machdep.h	Implement functions calls from within DDB on ia64. On ia64 a function	2005-07-02 23:52:37 +00:00
dig64.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
efi.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
elf.h	Add sysentvec->sv_fixlimits() hook so that we can catch cases on 64 bit	2003-09-25 01:10:26 +00:00
endian.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
exec.h	Use a common multi-inclusion protection, and add such a	2005-02-19 21:16:48 +00:00
float.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
floatingpoint.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
fpu.h	Use primitive types to avoid creating an artificial header dependency:	2004-12-11 06:15:12 +00:00
frame.h	Revamp of the syscall path, exception and context handling. The	2003-05-16 21:26:42 +00:00
gdb_machdep.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
ia64_cpu.h	For ia64_ptc_{e,g,ga,l}(), use instruction serialization. We	2005-08-06 19:54:31 +00:00
ieee.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
ieeefp.h	Cleanup and style(9) fixes. No functional change.	2003-08-11 21:25:19 +00:00
in_cksum.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
intr.h	Don't hardcode the address of the local (S)APIC (aka processor	2003-01-05 22:14:30 +00:00
intrcnt.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
kdb.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
limits.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
mca.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
md_var.h	Enhance ia64_flush_dirty() to handle the case in which td != curthread.	2005-07-05 17:12:18 +00:00
memdev.h	Remove extraneous ';'.	2004-08-01 18:51:44 +00:00
mutex.h
nexusvar.h
pal.h
param.h	Reduce the default MAXCPU from 16 to 4. This is in preparation of	2005-08-06 19:59:23 +00:00
pcb.h	As I said: the previous commit was untested... Remove an #endif which	2004-08-16 19:05:08 +00:00
pci_cfgreg.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
pcpu.h	Fixed a pedantic syntax error (a stray semicolon at the end of	2003-11-17 03:40:41 +00:00
pmap.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
pmc_mdep.h	MFP4:	2005-06-09 19:45:09 +00:00
proc.h	Improve SMP support:	2005-08-06 20:28:19 +00:00
profile.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
pte.h	Remove struct ia64_itir and use a plain old uint64_t instead.	2004-11-21 21:40:08 +00:00
ptrace.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
reg.h	Replace uint64_t with unsigned long in struct dbreg.	2004-03-20 05:27:14 +00:00
reloc.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
resource.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
runq.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
sal.h	MFp4:	2004-09-19 03:50:46 +00:00
sapicreg.h
sapicvar.h	Rewrite the SAPIC initialization to always program the RTEs with what	2003-09-10 22:49:38 +00:00
setjmp.h	Avoid using __aligned(16). Instead define the jmp_buf in terms of	2003-07-26 08:03:43 +00:00
sf_buf.h	MFamd64	2004-04-18 07:11:12 +00:00
sigframe.h
signal.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
smp.h	Improve SMP support:	2005-08-06 20:28:19 +00:00
stdarg.h	netchild's mega-patch to isolate compiler dependencies into a central	2005-03-02 21:33:29 +00:00
sysarch.h	Provide sysarch(2) prototypes in the MD sysarch.h headers. While I'm	2004-01-09 16:52:09 +00:00
ucontext.h	Simplify the contexts created by the kernel and remove the related	2003-12-07 20:47:33 +00:00
unwind.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00
varargs.h	Drop any and all support for varargs. There's no history to worry	2003-09-28 05:34:07 +00:00
vmparam.h	/* -> /*- for copyright notices, minor format tweaks as necessary	2005-01-06 22:18:23 +00:00