linux-kernel - Re: [PATCH v4] sched: automated per session task groups

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Date:	Sun, 21 Nov 2010 14:37:44 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Galbraith <efault@....de>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4] sched: automated per session task groups


Hello Mike,

* Mike Galbraith <efault@....de> wrote:

> On Tue, 2010-11-16 at 18:28 +0100, Ingo Molnar wrote:
> 
> > Mike,
> > 
> > Mind sending a new patch with a separate v2 announcement in a new thread, once you 
> > have something i could apply to the scheduler tree (for a v2.6.38 merge)?
> 
> Changes since last:
> - switch to per session vs tty
> - make autogroups visible in /proc/sched_debug
> - make autogroups visible in /proc/<pid>/autogroup
> - add nice level bandwidth tweakability to /proc/<pid>/autogroup

I tested it a bit, and autosched-v4 crashes on bootup with with attached config.

Note: the box has serial logging enabled and there's UART code in the stacktrace - 
maybe it's related. Let me know if you need the full bootup log.

Thanks,

	Ingo

[FAILED]
Enabling local filesystem quotas:  [  OK  ]
PPS event at 4294886381
Enabling /etc/fstab swaps:  swapon: /dev/hda2: Function not implemented
[FAILED]
INIT: Entering runleveBUG: unable to handle kernel paging request at f548604c
IP:l: 3 [<c10307f0>] update_cfs_shares+0x60/0x160
*pdpt = 0000000002017001 *pde = 00000000029d4067 *pte = 8000000035486160 
Oops: 0000 [#1] PREEMPT SMP DEBUG_PAGEALLOC
last sysfs file: /sys/block/sr0/dev

Pid: 1, comm: init Not tainted 2.6.37-rc2-tip+ #64308 A8N-E/System Product Name
EIP: 0060:[<c10307f0>] EFLAGS: 00010086 CPU: 1
EIP is at update_cfs_shares+0x60/0x160
EAX: fffffffe EBX: f547603b ECX: 00000400 EDX: 00000002
ESI: f5486000 EDI: 0000013b EBP: f6459d48 ESP: f6459d3c
 DS: 007b ES: 007b FS: 00d8 GS: 0033 SS: 0068
Process init (pid: 1, ti=f6458000 task=f6450000 task.ti=f6458000)
Stack:
 f5475a80 f6f066c0 00000004 f6459d84 c103256f 00000002 00000001 00000000
 c10324d0 c200e6c0 00000001 f6f06b34 00000046 f5475a80 f5475ac8 f6f066c0
 00000001 ffffffff f6459dfc c1b32820 f64a0010 f6459dc4 00000046 00000000
Call Trace:
 [<c103256f>] update_shares+0x9f/0x170
 [<c10324d0>] ? update_shares+0x0/0x170
 [<c1b32820>] schedule+0x580/0x9d0
 [<c1039335>] ? sub_preempt_count+0xa5/0xe0
 [<c1b330e5>] schedule_timeout+0x125/0x2a0
 [<c104fe60>] ? process_timeout+0x0/0x10
 [<c15aef4f>] uart_close+0x17f/0x350
 [<c105fea0>] ? autoremove_wake_function+0x0/0x50
 [<c1471f72>] tty_release+0x102/0x500
 [<c1125fdf>] ? locks_remove_posix+0xf/0xa0
 [<c1119a43>] ? fsnotify+0x1e3/0x2f0
 [<c11198d3>] ? fsnotify+0x73/0x2f0
 [<c10ea1e1>] fput+0xb1/0x230
 [<c10e7e7e>] filp_close+0x4e/0x70
 [<c10e7f14>] sys_close+0x74/0xc0
 [<c1002b90>] sysenter_do_call+0x12/0x31
Code: 00 00 00 8b 18 8b 79 1c 8b 49 18 2b b8 84 00 00 00 01 d3 89 d8 0f af c1 01 fb 74 07 89 c2 c1 fa 1f f7 fb 83 f8 02 ba 02 00 00 00 <8b> 5e 4c 0f 4d d0 39 d1 0f 42 d1 8b 4e 1c 85 c9 0f 84 6a 00 00 
EIP: [<c10307f0>] update_cfs_shares+0x60/0x160 SS:ESP 0068:f6459d3c
CR2: 00000000f548604c
---[ end trace f0ad48f53e29a8fe ]---
Kernel panic - not syncing: Fatal exception
Pid: 1, comm: init Tainted: G      D     2.6.37-rc2-tip+ #64308
Call Trace:
 [<c1b31ef1>] ? panic+0x66/0x15c
 [<c10065c3>] ? oops_end+0x83/0x90
 [<c10220fc>] ? no_context+0xbc/0x190
 [<c102225d>] ? __bad_area_nosemaphore+0x8d/0x130
 [<c10219a4>] ? vmalloc_fault+0x14/0x1c0
 [<c1021b64>] ? spurious_fault+0x14/0x110
 [<c1022317>] ? bad_area_nosemaphore+0x17/0x20
 [<c1022741>] ? do_page_fault+0x281/0x4c0
 [<c1008756>] ? native_sched_clock+0x26/0x90
 [<c1066033>] ? sched_clock_local+0xd3/0x1c0
 [<c10224c0>] ? do_page_fault+0x0/0x4c0
 [<c1b361e2>] ? error_code+0x5a/0x60
 [<c10224c0>] ? do_page_fault+0x0/0x4c0
 [<c10307f0>] ? update_cfs_shares+0x60/0x160
 [<c103256f>] ? update_shares+0x9f/0x170
 [<c10324d0>] ? update_shares+0x0/0x170
 [<c1b32820>] ? schedule+0x580/0x9d0
 [<c1039335>] ? sub_preempt_count+0xa5/0xe0
 [<c1b330e5>] ? schedule_timeout+0x125/0x2a0
 [<c104fe60>] ? process_timeout+0x0/0x10
 [<c15aef4f>] ? uart_close+0x17f/0x350
 [<c105fea0>] ? autoremove_wake_function+0x0/0x50
 [<c1471f72>] ? tty_release+0x102/0x500
 [<c1125fdf>] ? locks_remove_posix+0xf/0xa0
 [<c1119a43>] ? fsnotify+0x1e3/0x2f0
 [<c11198d3>] ? fsnotify+0x73/0x2f0
 [<c10ea1e1>] ? fput+0xb1/0x230
 [<c10e7e7e>] ? filp_close+0x4e/0x70
 [<c10e7f14>] ? sys_close+0x74/0xc0
 [<c1002b90>] ? sysenter_do_call+0x12/0x31
Rebooting in 1 seconds..Press any key to enter the menu


View attachment "config" of type "text/plain" (68198 bytes)