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SubjectRe: [announce] [patch] ultra-scalable O(1) SMP and UP scheduler
Ingo,
back in the 2.4.4-2.4.5 days when we experimented with the
child-runs-first scheduling patch we ran into quite a few programs that
died or locked up due to this. (I had a couple myself and heard of others)

try switching this back to the current behaviour and see if the lockups
still happen.

David Lang



On Fri, 4 Jan 2002, Dieter [iso-8859-15] Nützel wrote:

> Date: Fri, 4 Jan 2002 08:42:37 +0100
> From: "Dieter [iso-8859-15] Nützel" <Dieter.Nuetzel@hamburg.de>
> To: Ingo Molnar <mingo@elte.hu>
> Cc: Linux Kernel List <linux-kernel@vger.kernel.org>
> Subject: Re: [announce] [patch] ultra-scalable O(1) SMP and UP scheduler
>
> After the loop.c fix (nfs.o and sunrpc.o waiting) I got it running here, too.
>
> 2.4.17
> sched-O1-2.4.17-A0.patch
> 00_nanosleep-5 (Andrea)
> bootmem-2.4.17-pre6 (at all IBM)
> elevator-fix (Andrew, worth it for 2.4.18)
>
> plus ReiserFS fixes
> linux-2.4.17rc2-KLMN+exp_trunc+3fixes.patch
> corrupt_items_checks.diff
> kmalloc_cleanup.diff
> O-inode-attrs.patch
>
> To much trouble during 10_vm-21 (VM taken from 2.4.17rc2aa2) merge. So I
> skipped it this time. Much wanted for 2.4.18 (best I ever had).
>
> All the above (with preempt and 10_vm-21 AA except sched-O1-2.4.17-A0.patch)
> didn't crashed before.
>
> One system crash during the first X start up (kdeinit).
>
> ksymoops 2.4.3 on i686 2.4.17-O1. Options used
> -V (default)
> -k /proc/ksyms (default)
> -l /proc/modules (default)
> -o /lib/modules/2.4.17-O1/ (default)
> -m /boot/System.map (specified)
>
> invalid operand: 0000
> CPU: 0
> EIP: 0010:[<c01194ae>] Not tainted
> Using defaults from ksymoops -t elf32-i386 -a i386
> EFLAGS: 00010246
> eax: 00000000 ebx: c1a7ca40 ecx: c028e658 edx: dea3002c
> esi: dea30000 edi: 00000000 ebp: bffff19c esp: dea31fac
> ds: 0018 es: 0018 ss: 0018
> Process kdeinit (pid: 961, stackpage=dea31000)
> Stack: dea30000 40e1ed40 00000000 c01194ee 00000000 c0106d0b 00000000
> 00000001
> 40e208c4 40e1ed40 00000000 bffff19c 00000001 0000002b 0000002b
> 00000001
> 40da84dd 00000023 00000287 bffff170 0000002b
> Call Trace: [<c01194ee>] [<c0106d0b>]
> Code: 0f 0b e9 74 fe ff ff 8d 74 26 00 8d bc 27 00 00 00 00 8b 44
>
> >>EIP; c01194ae <do_exit+1ee/200> <=====
> Trace; c01194ee <sys_exit+e/10>
> Trace; c0106d0a <system_call+32/38>
> Code; c01194ae <do_exit+1ee/200>
> 00000000 <_EIP>:
> Code; c01194ae <do_exit+1ee/200> <=====
> 0: 0f 0b ud2a <=====
> Code; c01194b0 <do_exit+1f0/200>
> 2: e9 74 fe ff ff jmp fffffe7b <_EIP+0xfffffe7b> c0119328
> <do_exit+68/200>
> Code; c01194b4 <do_exit+1f4/200>
> 7: 8d 74 26 00 lea 0x0(%esi,1),%esi
> Code; c01194b8 <do_exit+1f8/200>
> b: 8d bc 27 00 00 00 00 lea 0x0(%edi,1),%edi
> Code; c01194c0 <complete_and_exit+0/20>
> 12: 8b 44 00 00 mov 0x0(%eax,%eax,1),%eax
>
> System runs relatively smooth but is under full system load.
>
> 7:57am up 1:36, 1 user, load average: 0.18, 0.18, 0.26
> 91 processes: 90 sleeping, 1 running, 0 zombie, 0 stopped
> CPU states: 0.7% user, 99.2% system, 0.0% nice, 0.0% idle
> Mem: 643064K av, 464212K used, 178852K free, 0K shrd, 89964K buff
> Swap: 1028120K av, 3560K used, 1024560K free 179928K
> cached
>
> PID USER PRI NI SIZE RSS SHARE STAT %CPU %MEM TIME COMMAND
> 1263 root 52 0 138M 42M 1728 S 33.0 6.7 16:46 X
> 1669 nuetzel 62 0 7544 7544 4412 S 16.6 1.1 11:57 artsd
> 10891 nuetzel 46 0 113M 17M 12600 S 12.0 2.7 2:35 kmail
> 1756 nuetzel 46 0 105M 9.9M 7288 S 10.8 1.5 7:45 kmix
> 1455 nuetzel 45 0 109M 12M 10508 S 7.9 2.0 1:55 kdeinit
> 1467 nuetzel 45 0 107M 10M 8456 S 5.5 1.7 0:55 kdeinit
> 1414 nuetzel 45 0 105M 8916 7536 S 3.9 1.3 1:59 kdeinit
> 814 squid 45 0 6856 6848 1280 S 2.3 1.0 0:52 squid
> 6 root 45 0 0 0 0 SW 2.1 0.0 0:42 kupdated
> 1458 nuetzel 45 0 109M 13M 9856 S 1.3 2.0 0:44 kdeinit
> 11099 nuetzel 47 0 1000 1000 776 R 1.3 0.1 0:00 top
> 556 root 45 0 1136 1136 848 S 1.1 0.1 0:14 smpppd
> 1678 nuetzel 45 0 7544 7544 4412 S 0.7 1.1 0:12 artsd
> 494 root 45 0 3072 3072 1776 S 0.3 0.4 0:18 named
> 1451 root 45 0 6860 6852 1416 S 0.1 1.0 0:14 xperfmon++
> 10871 nuetzel 45 0 111M 14M 11680 S 0.1 2.3 0:14 kdeinit
> 1 root 46 0 212 212 176 S 0.0 0.0 0:06 init
>
> /home/nuetzel> procinfo
> Linux 2.4.17-O1 (root@SunWave1) (gcc 2.95.3 20010315 ) #1 1CPU [SunWave1.]
>
> Memory: Total Used Free Shared Buffers Cached
> Mem: 643064 452988 190076 0 100096 183148
> Swap: 1028120 3560 1024560
>
> Bootup: Fri Jan 4 06:21:02 2002 Load average: 0.14 0.32 0.31
> 1894046082/90 11460
>
> user : 0:16:59.19 14.9% page in : 404106 disk 1: 31792r
> 70750w
> nice : 0:00:00.00 0.0% page out: 2580336 disk 2: 137r
> 225w
> system: 1:19:41.05 70.0% swap in : 2 disk 3: 1r
> 0w
> idle : 0:17:11.67 15.1% swap out: 695 disk 4: 1009r
> 0w
> uptime: 1:53:51.90 context : 2427806
>
> irq 0: 683191 timer irq 8: 154583 rtc
> irq 1: 12567 keyboard irq 9: 0 acpi, usb-ohci
> irq 2: 0 cascade [4] irq 10: 103402 aic7xxx
> irq 5: 9333 eth1 irq 11: 310704 eth0, EMU10K1
> irq 7: 115 parport0 [3] irq 12: 136392 PS/2 Mouse
>
> More processes die during second and third boot...
> I have some more crash logs if needed.
>
> Preempt plus lock-break is better for now.
> latencytest0.42-png crash the system.
>
> What next?
> Maybe a combination of O(1) and preempt?
>
> --
> Dieter Nützel
> Graduate Student, Computer Science
>
> University of Hamburg
> Department of Computer Science
> @home: Dieter.Nuetzel@hamburg.de
>
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