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SubjectRe: [announce] [patch] ultra-scalable O(1) SMP and UP scheduler
From
Ingo,

I tried the new scheduler with the kdev_t patch you mentioned and it
went very well for a long time. dbench 64, 128, 192 all completed,
3 iterations of bonnie++ were fine too.

When I ran the syscalls test from the http://ltp.sf.net/ I had a
few problems.

The first time the machine rebooted. The last thing in the logfile
was that pipe11 test was running. I believe it got past that point.
(the syscall tests run in alphabetic order).

The second time I ran it, when I was tailing the output the
machine seemed to freeze. (Usually the syscall tests complete
very quickly). I got the oops below on a serial console, it
scrolled much longer and didn't seem to like the call trace
would ever complete, so i rebooted.

I ran it a third time trying to isolate which test triggered the oops,
but the behavior was different again. The machine got very very
slow, but tests would eventually print their output. The test that
triggered the behavior was apparently between pipe11 and the setrlimit01
command below.

Here is top in the locked state:

33 processes: 23 sleeping, 4 running, 6 zombie, 0 stopped
CPU states: 0.3% user, 0.0% system, 0.0% nice, 99.6% idle
Mem: 385344K av, 83044K used, 302300K free, 0K shrd, 51976K buff
Swap: 152608K av, 0K used, 152608K free 16564K cached

PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
50 root 55 0 1620 1620 1404 R 0.1 0.4 0:05 sshd
8657 root 47 0 948 948 756 R 0.1 0.2 0:00 top
1 root 46 0 524 524 452 S 0.0 0.1 0:06 init
2 root 63 0 0 0 0 SW 0.0 0.0 0:00 keventd
3 root 63 19 0 0 0 RWN 0.0 0.0 0:00 ksoftirqd_CPU0
4 root 63 0 0 0 0 SW 0.0 0.0 0:00 kswapd
5 root 63 0 0 0 0 SW 0.0 0.0 0:00 bdflush
6 root 47 0 0 0 0 SW 0.0 0.0 0:00 kupdated
7 root 45 0 0 0 0 SW 0.0 0.0 0:00 kreiserfsd
28 root 45 0 620 620 516 S 0.0 0.1 0:00 syslogd
31 root 46 0 480 480 404 S 0.0 0.1 0:00 klogd
35 root 47 0 0 0 0 SW 0.0 0.0 0:00 eth0
40 root 49 0 816 816 664 S 0.0 0.2 0:00 iplog
41 root 46 0 816 816 664 S 0.0 0.2 0:00 iplog
42 root 45 0 816 816 664 S 0.0 0.2 0:00 iplog
43 root 45 0 816 816 664 S 0.0 0.2 0:00 iplog
44 root 58 0 816 816 664 S 0.0 0.2 0:01 iplog
46 root 53 0 1276 1276 1156 S 0.0 0.3 0:00 sshd
48 root 46 0 472 472 396 S 0.0 0.1 0:00 agetty
51 hrandoz 49 0 1164 1164 892 S 0.0 0.3 0:00 bash
59 root 46 0 1184 1184 1028 S 0.0 0.3 0:00 bash
702 root 45 0 1224 1224 1028 S 0.0 0.3 0:01 bash
8564 root 63 0 1596 1596 1404 S 0.0 0.4 0:00 sshd
8602 root 46 0 472 472 396 S 0.0 0.1 0:00 agetty
8616 hrandoz 63 0 1164 1164 892 S 0.0 0.3 0:00 bash
8645 root 49 0 1152 1152 888 S 0.0 0.2 0:00 bash
8647 root 46 0 468 468 388 R 0.0 0.1 0:00 setrlimit01
8649 root 46 0 0 0 0 Z 0.0 0.0 0:00 setrlimit01 <defunct>
8650 root 46 0 0 0 0 Z 0.0 0.0 0:00 setrlimit01 <defunct>
8651 root 46 0 0 0 0 Z 0.0 0.0 0:00 setrlimit01 <defunct>
8658 root 46 0 0 0 0 Z 0.0 0.0 0:00 setrlimit01 <defunct>
8659 root 46 0 0 0 0 Z 0.0 0.0 0:00 setrlimit01 <defunct>
8660 root 46 0 0 0 0 Z 0.0 0.0 0:00 setrlimit01 <defunct>

No modules in ksyms, skipping objects
Warning (read_lsmod): no symbols in lsmod, is /proc/modules a valid lsmod file?
Unable to handle kernel NULL pointer dereference at virtual address 00000000
*pde = c024be44
Oops: 0002
CPU: 0
EIP: 0010:[<c024c06d>] Not tainted
Using defaults from ksymoops -t elf32-i386 -a i386
EFLAGS: 00010046
eax: 00000000 ebx: d6184000 ecx: d6184290 edx: d6184290
esi: c024be3c edi: d6184001 ebp: d6185f98 esp: c024c06c
ds: 0018 es: 0018 ss: 0018
Process (pid: 0, stackpage=c024b000)
Stack: c024c06c c024c06c c024c074 c024c074 c024c07c c024c07c c024c084 c024c084
c024c08c c024c08c c024c094 c024c094 c024c09c c024c09c c024c0a4 c024c0a4
c024c0ac c024c0ac c024c0b4 c024c0b4 c024c0bc c024c0bc c024c0c4 c024c0c4
Code: c0 24 c0 6c c0 24 c0 74 c0 24 c0 74 c0 24 c0 7c c0 24 c0 7c
>>EIP; c024c06c <rt_array+28c/340> <=====
Code; c024c06c <rt_array+28c/340>
00000000 <_EIP>:
Code; c024c06c <rt_array+28c/340> <=====
0: c0 24 c0 6c shlb $0x6c,(%eax,%eax,8) <=====
Code; c024c070 <rt_array+290/340>
4: c0 24 c0 74 shlb $0x74,(%eax,%eax,8)
Code; c024c074 <rt_array+294/340>
8: c0 24 c0 74 shlb $0x74,(%eax,%eax,8)
Code; c024c078 <rt_array+298/340>
c: c0 24 c0 7c shlb $0x7c,(%eax,%eax,8)
Code; c024c07c <rt_array+29c/340>
10: c0 24 c0 7c shlb $0x7c,(%eax,%eax,8)
CPU: 0
EIP: 0010:[<c01110b5>] Not tainted
EFLAGS: 00010086
eax: c0000000 ebx: c0248000 ecx: c024ca58 edx: 01400000
esi: 00000000 edi: c0110c48 ebp: c1400000 esp: c0247fb8
ds: 0018 es: 0018 ss: 0018
Process $.#. (pid: 5373, stackpage=c0247000)
Stack: c0248000 00000000 c0110c48 c1400000 00000000 00000000 c0246000 00000000
00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
00000000 00000000
Call Trace: [<c0110c48>]
Code: f6 04 10 81 0f 84 02 fe ff ff 5b 5e 5f 5d 81 c4 8c 00 00 00
>>EIP; c01110b4 <do_page_fault+46c/488> <=====
Trace; c0110c48 <do_page_fault+0/488>
Code; c01110b4 <do_page_fault+46c/488>
00000000 <_EIP>:
Code; c01110b4 <do_page_fault+46c/488> <=====
0: f6 04 10 81 testb $0x81,(%eax,%edx,1) <=====
Code; c01110b8 <do_page_fault+470/488>
4: 0f 84 02 fe ff ff je fffffe0c <_EIP+0xfffffe0c> c0110ec0 <do_page_fault+278/488>
Code; c01110be <do_page_fault+476/488>
a: 5b pop %ebx
Code; c01110be <do_page_fault+476/488>
b: 5e pop %esi
Code; c01110c0 <do_page_fault+478/488>
c: 5f pop %edi
Code; c01110c0 <do_page_fault+478/488>
d: 5d pop %ebp
Code; c01110c2 <do_page_fault+47a/488>
e: 81 c4 8c 00 00 00 add $0x8c,%esp
CPU: 0
EIP: 0010:[<c0180e93>] Not tainted
EFLAGS: 00010002
eax: c1604120 ebx: 00000000 ecx: c0203cc0 edx: 00000000
esi: 00000000 edi: c0108e1c ebp: c1400000 esp: c0247f30
ds: 0018 es: 0018 ss: 0018
Process $.#. (pid: 5373, stackpage=c0247000)
Stack: 0000000f 00000000 c0110bfb 00000000 c0108afe 00000000 c0247f84 c01dcccd
c01dcd1f 00000000 00000001 c0247f84 c0108e70 c01dcd1f c0247f84 00000000
c0246000 00000000 c0108684 c0247f84 00000000 c0248000 c024ca58 01400000
Call Trace: [<c0110bfb>] [<c0108afe>] [<c0108e70>] [<c0108684>] [<c0110c48>]
[<c01110b5>] [<c0110c48>]
Code: 80 78 04 00 75 7f 8b 15 a0 90 20 c0 c7 05 44 1c 26 c0 1c 0f
>>EIP; c0180e92 <unblank_screen+4e/d8> <=====
Trace; c0110bfa <bust_spinlocks+22/4c>
Trace; c0108afe <die+42/50>
Trace; c0108e70 <do_double_fault+54/5c>
Trace; c0108684 <error_code+34/40>
Trace; c0110c48 <do_page_fault+0/488>
Trace; c01110b4 <do_page_fault+46c/488>
Trace; c0110c48 <do_page_fault+0/488>
Code; c0180e92 <unblank_screen+4e/d8>
00000000 <_EIP>:
Code; c0180e92 <unblank_screen+4e/d8> <=====
0: 80 78 04 00 cmpb $0x0,0x4(%eax) <=====
Code; c0180e96 <unblank_screen+52/d8>
4: 75 7f jne 85 <_EIP+0x85> c0180f16 <unblank_screen+d2/d8>
Code; c0180e98 <unblank_screen+54/d8>
6: 8b 15 a0 90 20 c0 mov 0xc02090a0,%edx
Code; c0180e9e <unblank_screen+5a/d8>
c: c7 05 44 1c 26 c0 1c movl $0xf1c,0xc0261c44
Code; c0180ea4 <unblank_screen+60/d8>
13: 0f 00 00
CPU: 0
EIP: 0010:[<c0180e93>] Not tainted
EFLAGS: 00010002
eax: c1604120 ebx: 00000000 ecx: c0203cc0 edx: 00000000
esi: 00000000 edi: c0108e1c ebp: c1400000 esp: c0247ea8
ds: 0018 es: 0018 ss: 0018
Process $.#. (pid: 5373, stackpage=c0247000)
Stack: 0000000f 00000000 c0110bfb 00000000 c0108afe 00000000 c0247efc c01dcccd
c01dcd1f 00000000 00000001 c0247efc c0108e70 c01dcd1f c0247efc 00000000
c0246000 00000000 c0108684 c0247efc 00000000 00000000 c0203cc0 00000000
Call Trace: [<c0110bfb>] [<c0108afe>] [<c0108e70>] [<c0108684>] [<c0108e1c>]
[<c0180e93>] [<c0110bfb>] [<c0108afe>] [<c0108e70>] [<c0108684>] [<c0110c48>]
[<c01110b5>] [<c0110c48>]
Code: 80 78 04 00 75 7f 8b 15 a0 90 20 c0 c7 05 44 1c 26 c0 1c 0f

It looks like you already have an idea where the problem is.
Looking forward to the next patch. :)
--
Randy Hron

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