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Date: Mon, 21 Feb 2022 21:10:20 +0000
From: Matthew Wilcox <willy@...radead.org>
To: Dave Chinner <david@...morbit.com>
Cc: kernel test robot <oliver.sang@...el.com>, lkp@...ts.01.org,
lkp@...el.com, LKML <linux-kernel@...r.kernel.org>,
"Darrick J. Wong" <darrick.wong@...cle.com>,
linux-xfs@...r.kernel.org, Christoph Hellwig <hch@...radead.org>
Subject: Re: [mm/readahead] a0b99df1aa: xfstests.xfs.421.fail
On Tue, Feb 22, 2022 at 07:55:29AM +1100, Dave Chinner wrote:
> On Mon, Feb 21, 2022 at 01:56:55PM +0000, Matthew Wilcox wrote:
> > On Mon, Feb 21, 2022 at 04:02:18PM +0800, kernel test robot wrote:
> > > commit: a0b99df1aa37d714eb80be5fb54efd56c88a3336 ("mm/readahead: Add large folio readahead")
> >
> > > xfs/420 - output mismatch (see /lkp/benchmarks/xfstests/results//xfs/420.out.bad)
> > > --- tests/xfs/420.out 2022-02-17 11:55:00.000000000 +0000
> > > +++ /lkp/benchmarks/xfstests/results//xfs/420.out.bad 2022-02-20 20:34:22.430378506 +0000
> > > @@ -13,9 +13,7 @@
> > > Seek holes and data in file2
> > > Whence Result
> > > DATA 0
> > > -HOLE 131072
> > > -DATA 196608
> > > -HOLE 262144
> > > +HOLE 524288
> >
> > Confirm this test now fails. I don't think it's actually a bug,
> > though. I think the test is now using larger pages to cache the
> > file, and it fails to report that there's a hole in the file.
> > Maybe there actually isn't a hole in the file any more; using
> > larger pages to cache the file means we'll now write more data
> > than we used to.
> >
> > Adding XFS people for their thoughts.
> >
> > Complete output:
> >
> > $ diff -u ../ktest/tests/xfstests/tests/xfs/420.out ktest-out/xfstests/xfs/420.out.bad
> > --- ../ktest/tests/xfstests/tests/xfs/420.out 2021-07-05 15:49:45.539887305 -0400
> > +++ ktest-out/xfstests/xfs/420.out.bad 2022-02-21 08:14:40.000000000 -0500
> > @@ -13,9 +13,7 @@
> > Seek holes and data in file2
> > Whence Result
> > DATA 0
> > -HOLE 131072
> > -DATA 196608
> > -HOLE 262144
> > +HOLE 524288
> > Compare files
> > c2803804acc9936eef8aab42c119bfac SCRATCH_MNT/test-420/file1
> > 017c08a9320aad844ce86aa9631afb98 SCRATCH_MNT/test-420/file2
> > @@ -28,9 +26,7 @@
> > Seek holes and data in file2
> > Whence Result
> > DATA 0
> > -HOLE 131072
> > -DATA 196608
> > -HOLE 262144
> > +HOLE 524288
> > Compare files
> > c2803804acc9936eef8aab42c119bfac SCRATCH_MNT/test-420/file1
> > 017c08a9320aad844ce86aa9631afb98 SCRATCH_MNT/test-420/file2
> >
> > So the file checksums are right, which means I didn't break the COW
> > functionality. But we're no longer reporting a hole at 128k.
>
> Can you post the contents of the 420.full output file so we can see
> what the output of the various commands that are run are? e.g.
> things like cowextsize that is configured, etc?
Sure! It's short, so I've included it inline.
meta-data=/dev/sdc isize=512 agcount=4, agsize=3670016 blks
= sectsz=512 attr=2, projid32bit=1
= crc=1 finobt=1, sparse=1, rmapbt=1
= reflink=1 bigtime=0
data = bsize=1024 blocks=14680064, imaxpct=25
= sunit=0 swidth=0 blks
naming =version 2 bsize=4096 ascii-ci=0, ftype=1
log =internal log bsize=1024 blocks=10240, version=2
= sectsz=512 sunit=0 blks, lazy-count=1
realtime =none extsz=4096 blocks=0, rtextents=0
Discarding blocks...Done.
[0] /mnt/scratch/test-420
[524288] /mnt/scratch/test-420
wrote 131072/131072 bytes at offset 0
128 KiB, 128 ops; 0.0000 sec (1.327 GiB/sec and 1391304.3478 ops/sec)
wrote 524288/524288 bytes at offset 0
512 KiB, 512 ops; 0.0003 sec (1.341 GiB/sec and 1406593.4066 ops/sec)
wrote 131072/131072 bytes at offset 0
128 KiB, 128 ops; 0.0000 sec (1.822 GiB/sec and 1910447.7612 ops/sec)
CoW the shared part then write into the empty part
[524288] /mnt/scratch/test-420/file1
[524288] /mnt/scratch/test-420/file2
wrote 65536/65536 bytes at offset 0
64 KiB, 64 ops; 0.0001 sec (416.667 MiB/sec and 426666.6667 ops/sec)
wrote 65536/65536 bytes at offset 196608
64 KiB, 64 ops; 0.0000 sec (1.695 GiB/sec and 1777777.7778 ops/sec)
wrote 65536/65536 bytes at offset 0
64 KiB, 64 ops; 0.0000 sec (1.387 GiB/sec and 1454545.4545 ops/sec)
wrote 65536/65536 bytes at offset 196608
64 KiB, 64 ops; 0.0000 sec (1.526 GiB/sec and 1600000.0000 ops/sec)
xfs_io: xfsctl(XFS_IOC_GETBMAPX) iflags=0x28 ["/mnt/scratch/test-420/file1"]: Invalid argument
/mnt/scratch/test-420/file1:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
0: [0..255]: 128..383 0 (128..383) 256 100000
1: [256..1023]: hole 768
xfs_io: xfsctl(XFS_IOC_GETBMAPX) iflags=0x28 ["/mnt/scratch/test-420/file2"]: Invalid argument
/mnt/scratch/test-420/file2:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
0: [0..255]: 128..383 0 (128..383) 256 100000
1: [256..1023]: hole 768
xfs_io: xfsctl(XFS_IOC_GETBMAPX) iflags=0x28 ["/mnt/scratch/test-420/file3"]: Invalid argument
/mnt/scratch/test-420/file3:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
0: [0..1023]: 512..1535 0 (512..1535) 1024
sync filesystem
xfs_io: xfsctl(XFS_IOC_GETBMAPX) iflags=0x28 ["/mnt/scratch/test-420/file1"]: Invalid argument
/mnt/scratch/test-420/file1:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
0: [0..127]: 128..255 0 (128..255) 128
1: [128..255]: 256..383 0 (256..383) 128 100000
2: [256..1023]: hole 768
xfs_io: xfsctl(XFS_IOC_GETBMAPX) iflags=0x28 ["/mnt/scratch/test-420/file2"]: Invalid argument
/mnt/scratch/test-420/file2:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
0: [0..127]: 1536..1663 0 (1536..1663) 128
1: [128..255]: 256..383 0 (256..383) 128 100000
2: [256..383]: hole 128
3: [384..511]: 1920..2047 0 (1920..2047) 128
4: [512..1023]: hole 512
xfs_io: xfsctl(XFS_IOC_GETBMAPX) iflags=0x28 ["/mnt/scratch/test-420/file3"]: Invalid argument
/mnt/scratch/test-420/file3:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
0: [0..1023]: 512..1535 0 (512..1535) 1024
Remount
xfs_io: xfsctl(XFS_IOC_GETBMAPX) iflags=0x28 ["/mnt/scratch/test-420/file1"]: Invalid argument
/mnt/scratch/test-420/file1:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
0: [0..127]: 128..255 0 (128..255) 128
1: [128..255]: 256..383 0 (256..383) 128 100000
2: [256..1023]: hole 768
xfs_io: xfsctl(XFS_IOC_GETBMAPX) iflags=0x28 ["/mnt/scratch/test-420/file2"]: Invalid argument
/mnt/scratch/test-420/file2:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
0: [0..127]: 1536..1663 0 (1536..1663) 128
1: [128..255]: 256..383 0 (256..383) 128 100000
2: [256..383]: hole 128
3: [384..511]: 1920..2047 0 (1920..2047) 128
4: [512..1023]: hole 512
xfs_io: xfsctl(XFS_IOC_GETBMAPX) iflags=0x28 ["/mnt/scratch/test-420/file3"]: Invalid argument
/mnt/scratch/test-420/file3:
EXT: FILE-OFFSET BLOCK-RANGE AG AG-OFFSET TOTAL
0: [0..1023]: 512..1535 0 (512..1535) 1024
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