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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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