Re: [LKP] [lkp] [xfs] 68a9f5e700: aim7.jobs-per-min -13.6% regression

[Ye Xiaolong]

On 08/11, Dave Chinner wrote:
>On Thu, Aug 11, 2016 at 11:16:12AM +1000, Dave Chinner wrote:
>> I need to see these events:
>> 
>> 	xfs_file*
>> 	xfs_iomap*
>> 	xfs_get_block*
>> 
>> For both kernels. An example trace from 4.8-rc1 running the command
>> `xfs_io -f -c 'pwrite 0 512k -b 128k' /mnt/scratch/fooey doing an
>> overwrite and extend of the existing file ends up looking like:
>> 
>> $ sudo trace-cmd start -e xfs_iomap\* -e xfs_file\* -e xfs_get_blocks\*
>> $ sudo cat /sys/kernel/tracing/trace_pipe
>>            <...>-2946  [001] .... 253971.750304: xfs_file_ioctl: dev 253:32 ino 0x84
>>           xfs_io-2946  [001] .... 253971.750938: xfs_file_buffered_write: dev 253:32 ino 0x84 size 0x40000 offset 0x0 count 0x20000
>>           xfs_io-2946  [001] .... 253971.750961: xfs_iomap_found: dev 253:32 ino 0x84 size 0x40000 offset 0x0 count 131072 type invalid startoff 0x0 startblock 24 blockcount 0x60
>>           xfs_io-2946  [001] .... 253971.751114: xfs_file_buffered_write: dev 253:32 ino 0x84 size 0x40000 offset 0x20000 count 0x20000
>>           xfs_io-2946  [001] .... 253971.751128: xfs_iomap_found: dev 253:32 ino 0x84 size 0x40000 offset 0x20000 count 131072 type invalid startoff 0x0 startblock 24 blockcount 0x60
>>           xfs_io-2946  [001] .... 253971.751234: xfs_file_buffered_write: dev 253:32 ino 0x84 size 0x40000 offset 0x40000 count 0x20000
>>           xfs_io-2946  [001] .... 253971.751236: xfs_iomap_found: dev 253:32 ino 0x84 size 0x40000 offset 0x40000 count 131072 type invalid startoff 0x0 startblock 24 blockcount 0x60
>>           xfs_io-2946  [001] .... 253971.751381: xfs_file_buffered_write: dev 253:32 ino 0x84 size 0x40000 offset 0x60000 count 0x20000
>>           xfs_io-2946  [001] .... 253971.751415: xfs_iomap_prealloc_size: dev 253:32 ino 0x84 prealloc blocks 128 shift 0 m_writeio_blocks 16
>>           xfs_io-2946  [001] .... 253971.751425: xfs_iomap_alloc: dev 253:32 ino 0x84 size 0x40000 offset 0x60000 count 131072 type invalid startoff 0x60 startblock -1 blockcount 0x90
>> 
>> That's the output I need for the complete test - you'll need to use
>> a better recording mechanism that this (e.g. trace-cmd record,
>> trace-cmd report) because it will generate a lot of events. Compress
>> the two report files (they'll be large) and send them to me offlist.
>
>Can you also send me the output of xfs_info on the filesystem you
>are testing?

Hi, Dave

Here is the xfs_info output:

# xfs_info /fs/ram0/
meta-data=/dev/ram0              isize=256    agcount=4, agsize=3145728 blks
         =                       sectsz=4096  attr=2, projid32bit=1
         =                       crc=0        finobt=0
data     =                       bsize=4096   blocks=12582912, imaxpct=25
         =                       sunit=0      swidth=0 blks
naming   =version 2              bsize=4096   ascii-ci=0 ftype=0
log      =internal               bsize=4096   blocks=6144, version=2
         =                       sectsz=4096  sunit=1 blks, lazy-count=1
realtime =none                   extsz=4096   blocks=0, rtextents=0

Thanks,
Xiaolong
>
>Cheers,
>
>Dave.
>-- 
>Dave Chinner
>david@xxxxxxxxxxxxx
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