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Re: [PATCH 8/8] Per-container pages reclamation [message #13004 is a reply to message #11844]

Thu, 17 May 2007 11:31

Balbir Singh
Messages: 491
Registered: August 2006

Senior Member

Pavel Emelianov wrote:
> Implement try_to_free_pages_in_container() to free the
> pages in container that has run out of memory.
>
> The scan_control->isolate_pages() function isolates the
> container pages only.
>
>

Hi, Pavel/Andrew,

I've started running some basic tests like lmbench and LTP vm stress
on the RSS controller.

With the controller rss_limit set to 256 MB, I saw the following panic
on a machine

Unable to handle kernel NULL pointer dereference at 000000000000001c RIP:
[<ffffffff80328581>] _raw_spin_lock+0xd/0xf6
PGD 3c841067 PUD 5d5d067 PMD 0
Oops: 0000 [1] SMP
CPU 2
Modules linked in: ipv6 hidp rfcomm l2cap bluetooth sunrpc video button battery asus_acpi backlight ac lp parport_pc parport nvram pcspkr amd_rng rng_core i2c_amd756 i2c_core
Pid: 13581, comm: mtest01 Not tainted 2.6.20-autokern1 #1
RIP: 0010:[<ffffffff80328581>] [<ffffffff80328581>] _raw_spin_lock+0xd/0xf6
RSP: 0000:ffff81003e6c9ce8 EFLAGS: 00010096
RAX: ffffffff8087f720 RBX: 0000000000000018 RCX: ffff81003f36f9d0
RDX: ffff8100807bb040 RSI: 0000000000000001 RDI: 0000000000000018
RBP: 0000000000000000 R08: ffff81003e6c8000 R09: 0000000000000002
R10: ffff810001021da8 R11: ffffffff8044658f R12: ffff81000c861e01
R13: 0000000000000018 R14: ffff81000c861eb8 R15: ffff810032d34138
FS: 00002abf7a1961e0(0000) GS:ffff81003edb94c0(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 000000008005003b
CR2: 000000000000001c CR3: 000000002ba6e000 CR4: 00000000000006e0
Process mtest01 (pid: 13581, threadinfo ffff81003e6c8000, task ffff81003d8ec040)
Stack: ffff810001003638 ffff810014a8c2c0 0000000000000000 ffff81000c861e01
0000000000000018 ffffffff80287166 ffff81000c861eb8 ffff81000000bac0
ffff81003f36f9a0 ffff81000c861e40 ffff81001d4b6a20 ffffffff8026a92e
Call Trace:
[<ffffffff80287166>] container_rss_move_lists+0x3b/0xaf
[<ffffffff8026a92e>] activate_page+0xc1/0xd0
[<ffffffff80245f15>] wake_bit_function+0x0/0x23
[<ffffffff8026ab34>] mark_page_accessed+0x1b/0x2f
[<ffffffff80265d25>] filemap_nopage+0x180/0x338
[<ffffffff80270474>] __handle_mm_fault+0x1f2/0xa81
[<ffffffff804c58ef>] do_page_fault+0x42b/0x7b3
[<ffffffff802484c4>] hrtimer_cancel+0xc/0x16
[<ffffffff804c2a89>] do_nanosleep+0x47/0x70
[<ffffffff802485f4>] hrtimer_nanosleep+0x58/0x119
[<ffffffff8023bc1f>] sys_sysinfo+0x15b/0x173
[<ffffffff804c3d3d>] error_exit+0x0/0x84

On analyzing the code, I found that the page is mapped (we have a page_mapped() check in
container_rss_move_lists()), but the page_container is invalid. Please review the fix
attached (we reset the page's container pointer to NULL when a page is completely unmapped)

--
Warm Regards,
Balbir Singh
Linux Technology Center
IBM, ISTL

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[Message index]

		[PATCH 0/8] RSS controller based on process containers (v2) By: xemul on Mon, 09 April 2007 12:18
		[PATCH 1/8] Resource counters By: xemul on Mon, 09 April 2007 12:31
		[PATCH 2/8] Add container pointer on struct page By: xemul on Mon, 09 April 2007 12:37
		Re: [PATCH 2/8] Add container pointer on struct page By: xemul on Fri, 13 April 2007 14:48
		Re: [PATCH 2/8] Add container pointer on struct page By: Jean-Pierre Dion on Fri, 13 April 2007 13:56
		[PATCH 3/8] Add container pointer on mm_struct By: xemul on Mon, 09 April 2007 12:43
		[PATCH 4/8] RSS container core By: xemul on Mon, 09 April 2007 12:45
		[PATCH 5/8] RSS accounting hooks over the code By: xemul on Mon, 09 April 2007 12:50
		[PATCH 6/8] Per container OOM killer By: xemul on Mon, 09 April 2007 12:52
		[PATCH 7/8] Page scanner changes needed to implement per-container scanner By: xemul on Mon, 09 April 2007 12:57
		[PATCH 8/8] Per-container pages reclamation By: xemul on Mon, 09 April 2007 12:59
		Re: [PATCH 8/8] Per-container pages reclamation By: xemul on Tue, 24 April 2007 10:29
		Re: [PATCH 8/8] Per-container pages reclamation By: Balbir Singh on Tue, 24 April 2007 11:01
		Re: [PATCH 8/8] Per-container pages reclamation By: xemul on Tue, 24 April 2007 11:37
		Re: [PATCH 8/8] Per-container pages reclamation By: Balbir Singh on Tue, 24 April 2007 09:47
		Re: [PATCH 8/8] Per-container pages reclamation By: Balbir Singh on Wed, 02 May 2007 09:51
		Re: [PATCH 8/8] Per-container pages reclamation By: Balbir Singh on Thu, 17 May 2007 11:31
		Re: [PATCH 8/8] Per-container pages reclamation By: xemul on Mon, 21 May 2007 15:15
		Re: [PATCH 8/8] Per-container pages reclamation By: Balbir Singh on Thu, 24 May 2007 07:59
		Re: [PATCH 0/8] RSS controller based on process containers (v2) By: Peter Zijlstra on Mon, 09 April 2007 15:54
		Re: [PATCH 0/8] RSS controller based on process containers (v2) By: xemul on Tue, 10 April 2007 08:27
		Re: [PATCH 0/8] RSS controller based on process containers (v2) By: Vaidyanathan Srinivas on Thu, 19 April 2007 05:37

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