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Message-ID: <20160811023659.GA2896@yexl-desktop>
Date: Thu, 11 Aug 2016 10:36:59 +0800
From: Ye Xiaolong <xiaolong.ye@...el.com>
To: Dave Chinner <david@...morbit.com>
Cc: "Huang, Ying" <ying.huang@...el.com>,
Linus Torvalds <torvalds@...ux-foundation.org>,
LKML <linux-kernel@...r.kernel.org>,
Bob Peterson <rpeterso@...hat.com>,
Wu Fengguang <fengguang.wu@...el.com>, LKP <lkp@...org>,
Christoph Hellwig <hch@....de>
Subject: Re: [LKP] [lkp] [xfs] 68a9f5e700: aim7.jobs-per-min -13.6% regression
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@...morbit.com
>_______________________________________________
>LKP mailing list
>LKP@...ts.01.org
>https://lists.01.org/mailman/listinfo/lkp
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