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

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Message-ID: <YJlEx27aM9oX8H+C@google.com>
Date:   Mon, 10 May 2021 07:35:51 -0700
From:   Jaegeuk Kim <jaegeuk@...nel.org>
To:     Chao Yu <yuchao0@...wei.com>
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 05/10, Chao Yu wrote:
> 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.

Good, sure. :)

> 
> Thanks,
> 
> > 
> > Thanks,
> > 
> > > 
> > > > 
> > > > Thanks,
> > > > 
> > > > > .
> > > > > 
> > > .
> > > 
> > 
> > 
> > _______________________________________________
> > Linux-f2fs-devel mailing list
> > Linux-f2fs-devel@...ts.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/linux-f2fs-devel
> > .
> >