Re: ULE problems on HTT SMP

On Fri, 27 Jun 2003, John Baldwin wrote:

>
> On 27-Jun-2003 Andrew Gallatin wrote:
> >
> > Jeff Roberson writes:
> >  >
> >  > Can you call kseq_print(0) and kseq_print(1) from ddb?
> >  >
> >
> > I found a different problem which is nearly as interesting.
> > Note that ps thinks sysctl is on cpu 255...
>
> #define NOCPU   0xff            /* For when we aren't on a CPU. (SMP) */
>
> So that isn't but so interesting. :)

The problem is that the logical cpu halting code does not put the halted
CPU in the stopped cpus set.  ULE has no way of knowing that it can not
migrate a thread to this cpu.  I'd prefer it if you could make this change
John, but I can certainly do it if you're busy.

Thanks,
Jeff

>
> > db> ps
> >   pid   proc     addr    uid  ppid  pgrp  flag   stat  wmesg    wchan  cmd
> >    62 c41ec000 d8d9a000    0    60    42 0004002 [CPU 255] sysctl
> >    60 c4175d3c d7bcc000    0    58    42 0000002 [SLP]wait 0xc4175d3c] sh
> >    58 c4175790 d7ba2000    0    51    42 0000002 [SLP]wait 0xc4175790] sh
> >    51 c4175b58 d7bcb000    0    42    42 0000002 [SLP]wait 0xc4175b58] sh
> >    42 c4025b58 d7b66000    0     1    42 0004002 [SLP]wait 0xc4025b58] sh
> >    41 c4025d3c d7b67000    0     0     0 0000204 [SLP]nfsidl 0xc03f9b8c] nfsiod 3
> >    40 c4173000 d7b96000    0     0     0 0000204 [SLP]nfsidl 0xc03f9b88] nfsiod 2
> >    39 c41731e4 d7b97000    0     0     0 0000204 [SLP]nfsidl 0xc03f9b84] nfsiod 1
> >    38 c41733c8 d7b98000    0     0     0 0000204 [SLP]nfsidl 0xc03f9b80] nfsiod 0
> >    37 c41735ac d7b99000    0     0     0 0000204 [SLP]vlruwt 0xc41735ac] vnlru
> >    36 c4173790 d7b9a000    0     0     0 0000204 [SLP]syncer 0xc03cacc0] syncer
> >    35 c4173974 d7b9b000    0     0     0 0000204 [SLP]psleep 0xc03f7e3c] bufdaemon
> >    34 c4173b58 d7b9c000    0     0     0 000020c [SLP]pgzero 0xc03ffc08] pagezero
> >     9 c4173d3c d7b9d000    0     0     0 0000204 [SLP]psleep 0xc03ffc34] vmdaemon
> >     8 c4175000 d7b9e000    0     0     0 0000204 [SLP]psleep 0xc03ffc20] pagedaemon
> >    33 c41751e4 d7b9f000    0     0     0 0000204 new [IWAIT] irq8: rtc
> >    32 c3f795ac d7b2b000    0     0     0 0000204 new [IWAIT] irq0: clk
> >    31 c3f79790 d7b2c000    0     0     0 0000204 [IWAIT] irq6: fdc0
> >    30 c3f79974 d7b2d000    0     0     0 0000204 new [IWAIT] irq7: ppc0
> >    29 c3f79b58 d7b2e000    0     0     0 0000204 new [IWAIT] irq3: sio1
> >    28 c3f79d3c d7b2f000    0     0     0 0000204 new [IWAIT] irq4: sio0
> >    27 c4025000 d7b39000    0     0     0 0000204 [IWAIT] swi0: tty:sio
> >    26 c40251e4 d7b3a000    0     0     0 0000204 new [IWAIT] irq11: em0
> >    25 c40253c8 d7b3b000    0     0     0 0000204 [IWAIT] irq15: ata1
> >    24 c40255ac d7b3c000    0     0     0 0000204 [IWAIT] irq14: ata0
> >    23 c4025790 d7b3d000    0     0     0 0000204 new [IWAIT] irq5: fxp0
> >     7 c4025974 d7b3e000    0     0     0 0000204 [SLP]actask 0xc04e40cc] acpi_task2
> >     6 c150a1e4 d6929000    0     0     0 0000204 [SLP]actask 0xc04e40cc] acpi_task1
> >     5 c150a3c8 d692a000    0     0     0 0000204 [SLP]actask 0xc04e40cc] acpi_task0
> >    22 c150a5ac d692b000    0     0     0 0000204 new [IWAIT] irq9: acpi0
> >    21 c150a790 d692c000    0     0     0 0000204 [IWAIT] swi3: cambio
> >    20 c150a974 d692d000    0     0     0 0000204 new [IWAIT] swi2: camnet
> >    19 c150ab58 d692e000    0     0     0 0000204 new [IWAIT] swi5:+
> >    18 c150ad3c d6956000    0     0     0 0000204 new [IWAIT] swi6: task queue
> >    17 c3f79000 d7b28000    0     0     0 0000204 [IWAIT] swi6: acpitaskq
> >    16 c3f791e4 d7b29000    0     0     0 0000204 [SLP]sleep 0xc03b5dc0] random
> >     4 c3f793c8 d7b2a000    0     0     0 0000204 [SLP]- 0xc03c41fc] g_down
> >     3 c1503000 d68d2000    0     0     0 0000204 [SLP]- 0xc03c41f8] g_up
> >     2 c15031e4 d6921000    0     0     0 0000204 [SLP]- 0xc03c41f0] g_event
> >    15 c15033c8 d6922000    0     0     0 0000204 new [IWAIT] swi4: vm
> >    14 c15035ac d6923000    0     0     0 000020c [IWAIT] swi7: tty:sio clock
> >    13 c1503790 d6924000    0     0     0 0000204 new [IWAIT] swi1: net
> >    12 c1503974 d6925000    0     0     0 000020c [CPU 0] idle: cpu0
> >    11 c1503b58 d6926000    0     0     0 000020c [CPU 1] idle: cpu1
> >     1 c1503d3c d6927000    0     0     1 0004200 [SLP]wait 0xc1503d3c] init
> >    10 c150a000 d6928000    0     0     0 0000204 [CV]ktrace 0xc03c7794] ktrace
> >     0 c03c42c0 c0513000    0     0     0 0000200 [SLP]sched 0xc03c42c0] swapper
> > db> sho pcpu
> > cpuid        = 0
> > curthread    = 0xc1504980: pid 12 "idle: cpu0"
> > curpcb       = 0xd68edda0
> > fpcurthread  = none
> > idlethread   = 0xc1504980: pid 12 "idle: cpu0"
> > currentldt   = 0x28
> > spin locks held:
> > db> sho pcpu 1
> > cpuid        = 1
> > curthread    = 0xc1504850: pid 11 "idle: cpu1"
> > curpcb       = 0xd68eada0
> > fpcurthread  = none
> > idlethread   = 0xc1504850: pid 11 "idle: cpu1"
> > currentldt   = 0x28
> > spin locks held:
> > db> t 62
> > mi_switch(c4177720,df,c036cbb1,ef,10000) at mi_switch+0x210
> > ast(d7bb8d48) at ast+0x3a0
> > doreti_ast() at doreti_ast+0x17
> >
> >
> > I hope that helps..
> >
> > Drew
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> --
>
> John Baldwin <jhb_at_FreeBSD.org>  <><  http://www.FreeBSD.org/~jhb/
> "Power Users Use the Power to Serve!"  -  http://www.FreeBSD.org/
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