linux-kernel - Re: [PATCH 00/28] mm: preemptibility -v3

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Date:	Thu, 10 Jun 2010 08:52:30 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
Cc:	Andrea Arcangeli <aarcange@...hat.com>,
	Avi Kivity <avi@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Rik van Riel <riel@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	akpm@...ux-foundation.org,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	David Miller <davem@...emloft.net>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Mel Gorman <mel@....ul.ie>, Nick Piggin <npiggin@...e.de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH 00/28] mm: preemptibility -v3

On Thu, 2010-06-10 at 09:45 +0800, Zhang, Yanmin wrote:
> On Mon, 2010-06-07 at 13:06 +0200, Peter Zijlstra wrote:
> > This patch-set makes part of the mm a lot more preemptible. It converts
> > i_mmap_lock and anon_vma->lock to mutexes and makes mmu_gather fully
> > preemptible.
> I applied it against 2.6.35-rc2 on x86_64 machine, but kernel booting panic.
> 
> Pid: 1, comm: init Not tainted 2.6.35-rc2-petermm #1 X7DW3/X7DW3
> RIP: 0010:[<ffffffff8160e055>]  [<ffffffff8160e055>] mutex_unlock
> +0x0/0x13
> RSP: 0018:ffff88022fc61a78  EFLAGS: 00010206
> RAX: 0000000000000000 RBX: ffff88022ebd5780 RCX: 0000000000000020
> RDX: 0000000000000000 RSI: 0000000000100173 RDI: 8000000000000025
> RBP: 0000000000000020 R08: 00007fffffffe000 R09: 0000000000000001
> R10: 0000000000000002 R11: ffffffff8128c275 R12: ffff88022e76b000
> R13: 0000000000021000 R14: ffff88022fc68000 R15: 00007fff4c0e6000
> FS:  0000000000000000(0000) GS:ffff8800021c0000(0000)
> knlGS:0000000000000000
> CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
> CR2: 0000000000000000 CR3: 000000022e76c000 CR4: 00000000000006e0
> DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
> DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
> Process init (pid: 1, threadinfo ffff88022fc60000, task
> ffff88022fc58000)
> Stack:
>  ffffffff810aabac 00000000ffffefff 0000000000000000 00007fff4c107000
> <0> ffff88022e76b000 00007fffffffe000 00007ffffffff000 00007fff4c106000
> <0> ffffffff810c5e5a ffff88022ebd5780 ffff88022ebd5780 ffff88022ebd5780
> Call Trace:
>  [<ffffffff810aabac>] ? expand_downwards+0x149/0x15a
>  [<ffffffff810c5e5a>] ? setup_arg_pages+0x333/0x361
>  [<ffffffff810c8955>] ? inode_permission+0x76/0x95
>  [<ffffffff810f8a19>] ? load_elf_binary+0x0/0x16c9
>  [<ffffffff810f8e7e>] ? load_elf_binary+0x465/0x16c9
>  [<ffffffff810c488a>] ? get_arg_page+0x4b/0xa4
>  [<ffffffff810f8a19>] ? load_elf_binary+0x0/0x16c9
>  [<ffffffff810c4ce4>] ? search_binary_handler+0xd4/0x26f
>  [<ffffffff810f7a1c>] ? load_script+0x0/0x1e4
>  [<ffffffff810f7bea>] ? load_script+0x1ce/0x1e4
>  [<ffffffff810c488a>] ? get_arg_page+0x4b/0xa4
>  [<ffffffff810c4ce4>] ? search_binary_handler+0xd4/0x26f
>  [<ffffffff810c6228>] ? do_execve+0x1e5/0x2b6
>  [<ffffffff81008d60>] ? sys_execve+0x35/0x53
>  [<ffffffff81003648>] ? kernel_execve+0x68/0xd0
>  [<ffffffff81000342>] ? init_post+0x5a/0xd4
>  [<ffffffff81cdf97d>] ? kernel_init+0x1e5/0x1ec
>  [<ffffffff810035d4>] ? kernel_thread_helper+0x4/0x10
>  [<ffffffff81cdf798>] ? kernel_init+0x0/0x1ec
>  [<ffffffff810035d0>] ? kernel_thread_helper+0x0/0x10
> Code: 1c 24 44 89 64 24 08 48 c7 44 24 20 07 fd 04 81 48 89 44 24 28 48
> 89 44 24 30 e8 26 ff ff ff 48 83 c4 48 5b 41 5c 41 5d 41 5e c3 <48> c7
> 47 18 00 00 00 00 f0 ff 07 7f 05 e8 01 00 00 00 c3 53 48 
> RIP  [<ffffffff8160e055>] mutex_unlock+0x0/0x13
>  RSP <ffff88022fc61a78>
> ---[ end trace dc724d36e0cd4a32 ]---

Oi, that's no good. Happen to have your .config handy, I didn't actually
see my machine do that.
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