Re: [lc-devel] Compressed Cache v0.23pre6

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On Fri, 14 Jun 2002, Rodrigo Souza de Castro wrote:

Hi Rodrigo,

>> again, testing pre6 of your patch :) ...
> Thank you! :-)=20
np :)

> I want to make this version stable in order to release 0.23 final.
i believe you, but that doesn't look so ;|

>> Unfortunately i must say, pre6 isn't stable as pre4 was ... Following
>> scenario:
> I have already run some tests, but not exactly those mentioned below, l=
ike
> interactive tests. I ran dbench, mmap, fillmem and many times kernel
> compilation. Anyway, I will have a look at those tests to check if I ca=
n
> reproduce the hang. Wait for a feedback.
ok, thanks alot.

> Could you try reproducing without preempt? I don't know very well what =
sort=20
> of changes the preempt patch makes, but I'd like to know if it still
> freezes without it.
Yes, i will do so now, but i really don't think the behaviour will be dif=
ferent. Hang on ...=20

>> Any other informations i can submit to help hunting that bug?
> Did you compile with page cache support?
sorry, forgot that in my previous mail. No, without Page cache support.

Args, now have a look. Thats the first oops i got, before there were just=
 freezes.
Just started up xwindows and got the following:

Jun 14 15:00:00 codeman kernel: [drm] Initialized r128 2.2.0 20020121 on =
minor 0
Jun 14 15:00:05 codeman kernel: divide error: 0000
Jun 14 15:00:05 codeman kernel: CPU:    0
Jun 14 15:00:05 codeman kernel: EIP:    0010:[comp_cache_fix_watermarks+2=
9/92]    Not tainted
Jun 14 15:00:05 codeman kernel: EFLAGS: 00013246
Jun 14 15:00:05 codeman kernel: eax: 0000cff0   ebx: c02a6168   ecx: 0000=
2000   edx: 00000000
Jun 14 15:00:05 codeman kernel: esi: 0000cff0   edi: c02a6168   ebp: c02a=
6168   esp: cd72de0c
Jun 14 15:00:05 codeman kernel: ds: 0018   es: 0018   ss: 0018
Jun 14 15:00:05 codeman kernel: Process XFree86 (pid: 11189, stackpage=3D=
cd72d000)
Jun 14 15:00:05 codeman kernel: Stack: 00000008 000001d2 c02a6168 c014180=
3 00002000 00000006 000001d2 c02a6168=20
Jun 14 15:00:05 codeman kernel:        c02a6168 c3dc93e0 c0138abd c02a616=
8 00000010 cd72c000 00000000 000001d2=20
Jun 14 15:00:05 codeman kernel:        c0139507 c02a62e4 00000120 0000001=
0 00000000 00000000 00000000 c01397e2=20
Jun 14 15:00:05 codeman kernel: Call Trace: [grow_comp_cache+191/300] [tr=
y_to_free_pages+77/104] [balance_classzone+119/588] [__allo
c_pages+262/356] [_alloc_pages+22/24]=20
Jun 14 15:00:05 codeman kernel:    [do_anonymous_page+76/224] [do_no_page=
+62/412] [handle_mm_fault+93/240] [do_page_fault+455/1257]=20
[do_page_fault+0/1257] [update_wall_time+11/60]=20
Jun 14 15:00:05 codeman kernel:    [timer_bh+46/968] [bh_action+38/116] [=
tasklet_hi_action+93/128] [do_softirq+109/216] [do_IRQ+214/
232] [error_code+52/64]=20
Jun 14 15:00:05 codeman kernel:=20
Jun 14 15:00:05 codeman kernel: Code: f7 35 38 e9 2d c0 89 c6 a1 44 e9 2d=
 c0 39 c6 73 04 89 c6 eb=20
Jun 14 15:00:05 codeman kernel:  divide error: 0000
Jun 14 15:00:05 codeman kernel: CPU:    0
Jun 14 15:00:05 codeman kernel: EIP:    0010:[comp_cache_fix_watermarks+2=
9/92]    Not tainted
Jun 14 15:00:05 codeman kernel: EFLAGS: 00013246
Jun 14 15:00:05 codeman kernel: eax: 0000cff0   ebx: c02a6168   ecx: 0000=
2000   edx: 00000000
Jun 14 15:00:05 codeman kernel: esi: 0000cff0   edi: c02a6168   ebp: 0000=
0000   esp: c2fb7f6c
Jun 14 15:00:05 codeman kernel: ds: 0018   es: 0018   ss: 0018
Jun 14 15:00:05 codeman kernel: Process kswapd (pid: 4, stackpage=3Dc2fb7=
000)
Jun 14 15:00:05 codeman kernel: Stack: 00000010 000001d0 c02a6168 c014180=
3 00002000 00000006 000001d0 c02a6168=20
Jun 14 15:00:05 codeman kernel:        c02a6168 00000000 c0138abd c02a616=
8 00000010 c02a6168 00000001 c2fb6000=20
Jun 14 15:00:05 codeman kernel:        c0138b3b c02a60c0 00000000 c2fb625=
1 0008e000 c0138b9e c02a60c0 c2fb6000=20
Jun 14 15:00:05 codeman kernel: Call Trace: [grow_comp_cache+191/300] [tr=
y_to_free_pages+77/104] [kswapd_balance_pgdat+55/132] [kswa
pd_balance+22/44] [kswapd+153/188]=20
Jun 14 15:00:05 codeman kernel:    [kernel_thread+40/56]=20
Jun 14 15:00:05 codeman kernel:=20
Jun 14 15:00:05 codeman kernel: Code: f7 35 38 e9 2d c0 89 c6 a1 44 e9 2d=
 c0 39 c6 73 04 89 c6 eb=20

This was 15mb of free RAM and no swap usage. System is not freezed,
but X-Console is totally freezed. Then i tried to compile a new kernel, a=
fter
some doing of "make dep" system was totally freezed w/o any oops or panic=
s.

ksymoops of the above:
----------------------

--=20
Kind regards
        Marc-Christian Petersen

http://sourceforge.net/projects/wolk

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