Re: [PATCH V2 0/2] ovl: implement async IO routines

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ping again.

>From my test, the patchset can improve the performance significantly.

The following data are tested on INTEL P4510 NVMe using fio with iodepth
128 and blocksize 4k.

----------------------------------------------------------------
                      |       RANDREAD     |     RANDWRITE     |
----------------------------------------------------------------
w/ async IO routines  |        377MB/s     |      405MB/s      |
----------------------------------------------------------------
w/o async IO routines |        32.0MB/s	   |      62.3MB/s     |
----------------------------------------------------------------

Regards,
Jiufei

On 2019/11/26 上午10:00, Jiufei Xue wrote:
> Hi miklos,
> 
> Could you please kindly review this patch and give some advice?
> 
> Thanks,
> Jiufei
> 
> On 2019/11/20 下午5:45, Jiufei Xue wrote:
>> ovl stacks regular file operations now. However it doesn't implement
>> async IO routines and will convert async IOs to sync IOs which is not
>> expected.
>>
>> This patchset implements overlayfs async IO routines.
>>
>> Jiufei Xue (2)
>> vfs: add vfs_iocb_iter_[read|write] helper functions
>> ovl: implement async IO routines
>>
>>  fs/overlayfs/file.c      |  116 +++++++++++++++++++++++++++++++++++++++++------
>>  fs/overlayfs/overlayfs.h |    2
>>  fs/overlayfs/super.c     |   12 ++++
>>  fs/read_write.c          |   58 +++++++++++++++++++++++
>>  include/linux/fs.h       |   16 ++++++
>>  5 files changed, 188 insertions(+), 16 deletions(-)
>>
> 



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