Work-in-progress commit syncing up pmap cleanups that I have been working

on for a while:
- fine grained TLB shootdown for SMP on i386
- ranged TLB shootdowns.. eg: specify a range of pages to shoot down with
  a single IPI, since the IPI is very expensive.  Adjust some callers
  that used to trigger this inside tight loops to do a ranged shootdown
  at the end instead.
- PG_G support for SMP on i386 (options ENABLE_PG_G)
- defer PG_G activation till after we decide what we are going to do with
  PSE and the 4MB pages at the start of the kernel.  This should solve
  some rumored strangeness about stale PG_G entries getting stuck
  underneath the 4MB pages.
- add some instrumentation for the fine TLB shootdown
- convert some asm instruction wrappers from functions to inlines.  gcc
  seems to do a fair bit better with this.
- [temporarily!] pessimize the tlb shootdown IPI handlers.  I will fix
  this again shortly.

This has been working fairly well for me for a while, but I have tweaked
it again prior to commit since my last major testing round.  The only
outstanding problem that I know of is PG_G related, which is why there
is an option for it (not on by default for SMP).  I have seen a world
speedups by a few percent (as much as 4 or 5% in one case) but I have
*not* accurately measured this - I am a bit sceptical of these numbers.

1 files changed, 2 insertions, 1 deletions

diff --git a/sys/i386/include/smp.h b/sys/i386/include/smp.h
index 34228e2..4136c20 100644
--- a/sys/i386/include/smp.h
+++ b/sys/i386/include/smp.h
@@ -51,6 +51,8 @@ extern int current_postcode;  /** XXX currently in mp_machdep.c */
  * Interprocessor interrupts for SMP.
  */
 #define	IPI_INVLTLB		XINVLTLB_OFFSET
+#define	IPI_INVLPG		XINVLPG_OFFSET
+#define	IPI_INVLRNG		XINVLRNG_OFFSET
 #define	IPI_RENDEZVOUS		XRENDEZVOUS_OFFSET
 #define	IPI_AST			XCPUAST_OFFSET
 #define	IPI_STOP		XCPUSTOP_OFFSET
@@ -107,7 +109,6 @@ void	assign_apic_irq		__P((int apic, int intpin, int irq));
 void	revoke_apic_irq		__P((int irq));
 void	bsp_apic_configure	__P((void));
 void	init_secondary		__P((void));
-void	smp_invltlb		__P((void));
 void	forward_statclock	__P((void));
 void	forwarded_statclock	__P((struct trapframe frame));
 void	forward_hardclock	__P((void));