linux-kernel - Re: [f2fs-dev] [PATCH v4] f2fs: compress: add compress

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Date:   Mon, 10 May 2021 17:05:08 +0800
From:   Chao Yu <yuchao0@...wei.com>
To:     Jaegeuk Kim <jaegeuk@...nel.org>
CC:     <linux-kernel@...r.kernel.org>,
        <linux-f2fs-devel@...ts.sourceforge.net>
Subject: Re: [f2fs-dev] [PATCH v4] f2fs: compress: add compress_inode to cache
 compressed blockst

On 2021/4/22 14:07, Chao Yu wrote:
> On 2021/4/22 11:59, Jaegeuk Kim wrote:
>> On 04/21, Chao Yu wrote:
>>> On 2021/3/11 4:52, Jaegeuk Kim wrote:
>>>> On 03/09, Chao Yu wrote:
>>>>> On 2021/3/9 8:01, Jaegeuk Kim wrote:
>>>>>> On 03/05, Chao Yu wrote:
>>>>>>> On 2021/3/5 4:20, Jaegeuk Kim wrote:
>>>>>>>> On 02/27, Jaegeuk Kim wrote:
>>>>>>>>> On 02/04, Chao Yu wrote:
>>>>>>>>>> Jaegeuk,
>>>>>>>>>>
>>>>>>>>>> On 2021/2/2 16:00, Chao Yu wrote:
>>>>>>>>>>> -	for (i = 0; i < dic->nr_cpages; i++) {
>>>>>>>>>>> +	for (i = 0; i < cc->nr_cpages; i++) {
>>>>>>>>>>>        		struct page *page = dic->cpages[i];
>>>>>>>>>>
>>>>>>>>>> por_fsstress still hang in this line?
>>>>>>>>>
>>>>>>>>> I'm stuck on testing the patches, since the latest kernel is panicking somehow.
>>>>>>>>> Let me update later, once I can test a bit. :(
>>>>>>>>
>>>>>>>> It seems this works without error.
>>>>>>>> https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git/commit/?h=dev&id=4e6e1364dccba80ed44925870b97fbcf989b96c9
>>>>>>>
>>>>>>> Ah, good news.
>>>>>>>
>>>>>>> Thanks for helping to test the patch. :)
>>>>>>
>>>>>> Hmm, I hit this again. Let me check w/o compress_cache back. :(
>>>>>
>>>>> Oops :(
>>>>
>>>> Ok, apprantely that panic is caused by compress_cache. The test is running over
>>>> 24hours w/o it.
>>>
>>> Jaegeuk,
>>>
>>> I'm still struggling troubleshooting this issue.
>>>
>>> However, I failed again to reproduce this bug, I doubt the reason may be
>>> my test script and environment(device type/size) is different from yours.
>>> (btw, I used pmem as back-end device, and test w/ all fault injection
>>> points and w/o write_io/checkpoint fault injection points)
>>>
>>> Could you please share me your run.sh script? and test command?
>>>
>>> And I'd like to ask what's your device type and size?
>>
>> I'm using qemu with 16GB with this script.
>> https://github.com/jaegeuk/xfstests-f2fs/blob/f2fs/run.sh
>>
>> ./run.sh por_fsstress
> 
> Thanks, let me check the difference, and try again.

Finally, I can reproduce this bug, and after troubleshooting this
issue, I guess the root cause is not related to this patch, could
you please test patch "f2fs: compress: fix race condition of overwrite
vs truncate" with compress_cache enabled? I've ran por_fsstress case
for 6 hours w/o any problems.

Thanks,

> 
> Thanks,
> 
>>
>>>
>>> Thanks,
>>>
>>>> .
>>>>
>> .
>>
> 
> 
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