Re: [PATCH v3 0/4] ext4: improve delalloc buffer write performance

[Zhang Yi <yi.zhang@huawei.com>]

Hi, Ted

Do you plan to merge this speed up patch set for 5.15?

Thanks,
Yi.

On 2021/7/16 20:20, Zhang Yi wrote:
> Hi,
> 
> Changes since v2:
>  - Patch 3: fix misleading comment about data truncate in the error path
>             of ext4_write_inline_data_end().
> 
> Thanks,
> Yi.
> 
> --------
> 
> Changes since v1:
> 
>  - Patch 1: add comments to explain why and how to update i_disksize in
>             ext4_da_write_end().
>  - Patch 3: update i_disksize only if copied is not zero and drop
>             i_size_changed parameter, also drop unused EXT4_STATE_JDATA
>             and i_datasync_tid update code hook.
> 
> Original description:
> 
> This patchset address to improve buffer write performance with delalloc.
> The first patch reduce the unnecessary update i_disksize, the second two
> patch refactor the inline data write procedure and also do some small
> fix, the last patch do improve by remove all unnecessary journal handle
> in the delalloc write procedure.
> 
> After this patch set, we could get a lot of performance improvement.
> Below is the Unixbench comparison data test on my machine with 'Intel
> Xeon Gold 5120' CPU and nvme SSD backend.
> 
> Test cmd:
> 
>   ./Run -c 56 -i 3 fstime fsbuffer fsdisk
> 
> Before this patch set:
> 
>   System Benchmarks Partial Index           BASELINE       RESULT   INDEX
>   File Copy 1024 bufsize 2000 maxblocks       3960.0     422965.0   1068.1
>   File Copy 256 bufsize 500 maxblocks         1655.0     105077.0   634.9
>   File Copy 4096 bufsize 8000 maxblocks       5800.0    1429092.0   2464.0
>                                                                     ========
>   System Benchmarks Index Score (Partial Only)                      1186.6
> 
> After this patch set:
> 
>   System Benchmarks Partial Index           BASELINE       RESULT   INDEX
>   File Copy 1024 bufsize 2000 maxblocks       3960.0     732716.0   1850.3
>   File Copy 256 bufsize 500 maxblocks         1655.0     184940.0   1117.5
>   File Copy 4096 bufsize 8000 maxblocks       5800.0    2427152.0   4184.7
>                                                                     ========
>   System Benchmarks Index Score (Partial Only)                      2053.0
> 
> 
> 
> 
> Zhang Yi (4):
>   ext4: check and update i_disksize properly
>   ext4: correct the error path of ext4_write_inline_data_end()
>   ext4: factor out write end code of inline file
>   ext4: drop unnecessary journal handle in delalloc write
> 
>  fs/ext4/ext4.h   |   3 -
>  fs/ext4/inline.c | 120 ++++++++++++++++++-------------------
>  fs/ext4/inode.c  | 150 ++++++++++++-----------------------------------
>  3 files changed, 99 insertions(+), 174 deletions(-)
>