xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

raid5: set write hint for PPL

Browse Source 
When the Partial Parity Log is enabled, circular buffer is used to store
PPL data. Each write to RAID device causes overwrite of data in this buffer
so some write_hint can be set to those request to help drives handle
garbage collection. This patch adds new sysfs attribute which can be used
to specify which write_hint should be assigned to PPL.

Acked-by: Guoqing Jiang <gqjiang@suse.com>
Signed-off-by: Mariusz Dabrowski <mariusz.dabrowski@intel.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
This commit is contained in:
Mariusz Dabrowski
2019-02-18 15:04:09 +01:00
committed by Song Liu
parent 9205e44916
commit a596d08677
4 changed files with 68 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
Documentation/admin-guide/md.rst
View File

@@ -756,3 +756,6 @@ These currently include:
The cache mode for raid5. raid5 could include an extra disk for
caching. The mode can be "write-throuth" and "write-back". The
default is "write-through".
ppl_write_hint
NVMe stream ID to be set for each PPL write request.