7.1-STABLE does not boot after recent superpage support MFC

[Igor Sysoev]

On Fri, Feb 27, 2009 at 10:26:15AM -0500, John Baldwin wrote:

> On Friday 27 February 2009 8:08:30 am Igor Sysoev wrote:
> > Is anyone able to boot kernel with recently merged superpage support ?
> > I have csup'd world to
> > *default date=2009.02.26.23.59.59
> > then rebuild world and kernel does not boot:
> > 
> > FreeBSD 7.1-STABLE #4: Fri Feb 27 11:59:13 MSK 2009
> >     XXXXXXXXXXXXXXXXXXXXX
> > kernel trap 12 with interrupts disabled
> > 
> > 
> > Fatal trap 12: page fault while in kernel mode
> > cpuid = 0; apic id = 00
> > fault virtual address   = 0x0
> > fault code              = supervisor read data, page not present
> > instruction pointer     = 0x8:0xffffffff803b1d80
> > stack pointer           = 0x10:0xffffffff80686ce0
> > frame pointer           = 0x10:0xffffffff80686d00
> > code segment            = base 0x0, limit 0xfffff, type 0x1b
> >                         = DPL 0, pres 1, long 1, def32 0, gran 1
> > processor eflags        = resume, IOPL = 0
> > current process         = 0 ()
> > trap number             = 12
> > panic: page fault
> > cpuid = 0
> > 
> > And the message is cycled. The kernel does not boot despite
> > vm.pmap.pg_ps_enabled value.
> 
> This should now be fixed, apologies for the breakage. :(

Thank you, your commit has fixed the bug.

Now I have

$sysctl vm.pmap.pde
vm.pmap.pde.promotions: 518
vm.pmap.pde.p_failures: 4534
vm.pmap.pde.mappings: 0
vm.pmap.pde.demotions: 423

Does this mean that (518 - 423) * 2 = 190M are mapped via 2M pages ?


-- 
Igor Sysoev
http://sysoev.ru/en/