Re: 2.4.20: Proccess stuck in __lock_page ...

manish
2003-05-27T19:22:02Z

Marcelo Tosatti wrote:

>
>On Tue, 27 May 2003, manish wrote:
>
>>Marcelo Tosatti wrote:
>>
>>>On Tue, 27 May 2003, manish wrote:
>>>
>>>>Marc-Christian Petersen wrote:
>>>>
>>>>>On Tuesday 27 May 2003 20:33, Marcelo Tosatti wrote:
>>>>>
>>>>>Hi Marcelo,
>>>>>
>>>>>>It seems your "fix-pausing" patch is fixing a potential wakeup
>>>>>>miss, right? (I looked quickly throught it). Could you explain me the
>>>>>>problem its trying to fix and how?
>>>>>>
>>>>>Please have also a look here:
>>>>>
>>>>>http://hypermail.idiosynkrasia.net/linux-kernel/archived/2002/week45/0305.html
>>>>>
>>>>>ciao, Marc
>>>>>
>>>>Hello !
>>>>
>>>>I applied the fix-pausing-2 patch to the 2.4.20 kernel. This time on,
>>>>the stack trace:
>>>>
>>>>sys_write
>>>>generic_file_write
>>>>ext2_get_group_desc
>>>>bread
>>>>__wait_on_buffer
>>>>schedule
>>>>
>>>Huh? You mean bonnie still deadlocks or ?
>>>
>>At the time the processes get stuck:
>>
>>
>>[root@dyn-10-123-130-235 vm]# more /proc/meminfo
>> total: used: free: shared: buffers: cached:
>>Mem: 3709870080 3699126272 10743808 0 18313216 3531255808
>>Swap: 1077501952 0 1077501952
>>MemTotal: 3622920 kB
>>MemFree: 10492 kB
>>MemShared: 0 kB
>>Buffers: 17884 kB
>>Cached: 3448492 kB
>>SwapCached: 0 kB
>>Active: 25252 kB
>>Inactive: 3445344 kB
>>HighTotal: 2752512 kB
>>HighFree: 2120 kB
>>LowTotal: 870408 kB
>>LowFree: 8372 kB
>>SwapTotal: 1052248 kB
>>SwapFree: 1052248 kB
>>
>
>Ok, so just to confirm: You're still getting pauses with Andrea's patches
>but no hangs anymore?
>
>Correct?
>
Hi Marcelo,

I have applied Andrea's patch to two kernels:

1. Stock 2.4.20
2. 2.4.20 with the io_request_lock removed.

The tests on the first one are still going. The tests on the second one
showed processes getting stuck for long times (> 5 minutes) and not
paused ...

Thanks
Manish