jim wrote:
> If anyone finds the cause of the delay on starting init with NFS root file
> systems, please post to the list.
I don't know the cause of the delay, but as I was debugging another
kernel problem, I remembered this and hit ^C in gdb a few times to see what
was going on. In both cases, it was handling mm faults. I attached
the output from my gdb macros just in case it jogs anyone's brain cells.
To really figure out what is going on, we may have to compare old vs.
new.
Scott
(gdb) ps
Address PID State User NIP Kernel NIP device comm
0xC013DFD0 0<Running 0xC00060E4 swapper
0xC0344000 1 Disksleep 0x30003578 0xC0006FD8 init
0xC03DA000 2 Sleeping 0xC0006FD8 keventd
0xC03D6000 3 Sleeping 0xC0006FD8 ksoftirqd_CPU0
0xC03D4000 4 Sleeping 0xC0006FD8 kswapd
0xC03D2000 5 Sleeping 0xC0006FD8 bdflush
0xC03D0000 6 Sleeping 0xC0006FD8 kupdated
0xC7DD4000 7 Sleeping 0xC0006FD8 rpciod
(gdb) kbt 1
Task "init":
0xC0345D40: 0xc0006fd8 <_switch_to+96>: stw r3,0(r30)
0xC0345D60: 0xc0010f30 <schedule+1368>: lwz r9,8(r31)
0xC0345D90: 0xc0028cd4 <__lock_page+192>: lwarx r0,r0,r28
0xC0345DC0: 0xc0028d48 <lock_page+52>: lwz r0,20(r1)
0xC0345DD0: 0xc002a528 <filemap_nopage+376>: lwz r0,8(r31)
0xC0345E00: 0xc0025b08 <do_no_page+116>: mr. r31,r3
0xC0345E30: 0xc0025ce0 <handle_mm_fault+112>:
b 0xc0025d58 <handle_mm_fault+232>
0xC0345E60: 0xc000ea74 <do_page_fault+652>: cmpwi r3,1
0xC0345F20: 0xc0004854 <ret_from_except>: lwz r3,148(r1)
(gdb) cont
Continuing.
Program received signal SIGSTOP, Stopped (signal).
idled () at idle.c:110
110 if (current->need_resched) {
(gdb) ps
Address PID State User NIP Kernel NIP device comm
0xC013DFD0 0<Running 0xC00060E4 swapper
0xC0344000 1 Disksleep 0x30003578 0xC0006FD8 init
0xC03DA000 2 Sleeping 0xC0006FD8 keventd
0xC03D6000 3 Sleeping 0xC0006FD8 ksoftirqd_CPU0
0xC03D4000 4 Sleeping 0xC0006FD8 kswapd
0xC03D2000 5 Sleeping 0xC0006FD8 bdflush
0xC03D0000 6 Sleeping 0xC0006FD8 kupdated
0xC7DD4000 7 Sleeping 0xC0006FD8 rpciod
(gdb) kbt 1
Task "init":
0xC0345D40: 0xc0006fd8 <_switch_to+96>: stw r3,0(r30)
0xC0345D60: 0xc0010f30 <schedule+1368>: lwz r9,8(r31)
0xC0345D90: 0xc0028cd4 <__lock_page+192>: lwarx r0,r0,r28
0xC0345DC0: 0xc0028d48 <lock_page+52>: lwz r0,20(r1)
0xC0345DD0: 0xc002a528 <filemap_nopage+376>: lwz r0,8(r31)
0xC0345E00: 0xc0025b08 <do_no_page+116>: mr. r31,r3
0xC0345E30: 0xc0025ce0 <handle_mm_fault+112>:
b 0xc0025d58 <handle_mm_fault+232>
0xC0345E60: 0xc000ea74 <do_page_fault+652>: cmpwi r3,1
0xC0345F20: 0xc0004854 <ret_from_except>: lwz r3,148(r1)
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