# Re: \[PATCH 00/20\] bcache patches for Linux v5.12

- From: Jens Axboe \<axboe@kernel.dk\>
- Date: 2021-02-10 15:12:02 
- List: linux-bcache
- Page: https://ratatoskr.run/linux-bcache/2021/02/6400949
- Thread: https://ratatoskr.run/linux-bcache/2021/02/6400921/t.md

```text
On 2/9/21 10:07 PM, Coly Li wrote:
> Hi Jens,
> 
> This is the first wave bcache patches for Linux v5.12.
> 
> It is nice to see in this round we have 3 new patch contributors:
> Jianpeng Ma, Qiaowei Ren and Kai Krakow.
> 
> In this series, the EXPERIMENTAL patches from Jianpeng Ma, Qiaowei Ren
> and me are initial effort to store bcache meta-data on NVDIMM namespace.
> The NVDIMM space is managed and mapped via DAX interface, and accessed
> by linear address. In this submission we store bcache journal on NVDIMM,
> in future bcache btree nodes and other meta data will be added in too,
> before we remove the EXPERIMENTAL statues.
> 
> Dongdong Tao contributes a performance optimization when
> bcache cache buckets are highly fregmented, Dongdong's patch makes the
> dirty data writeback faster and from his benchmark reprots such changes
> have recognized improvement for randome write I/O thoughput and latency
> for highly fregmented buckets, and no regression for regular I/O
> observed.
> 
> Kai Krakow contributes 4 patches to offload system_wq usage to separated
> btree_io_wq and bch_flush_wq. In his environment the daily backup job
> throughput increases from 60.2MB/s to 419MB/s and accomplished time
> reduced from 14h29m to 2h13m.
> 
> Joe Perches also contributes a fine code stype fix which I pick for this
> submission.
> 
> Please take them for Linux v5.12 merge window.

Applied 1-6 for now, that weird situation with the user visible header
needs to get resolved before it can go any further.

-- 
Jens Axboe

```