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
