On Thu, Nov 29, 2018 at 11:23:58AM +0900, Sergey Senozhatsky wrote: > On (11/27/18 14:54), Minchan Kim wrote: > > diff --git a/Documentation/ABI/testing/sysfs-block-zram > > b/Documentation/ABI/testing/sysfs-block-zram > > index 65fc33b2f53b..9d2339a485c8 100644 > > --- a/Documentation/ABI/testing/sysfs-block-zram > > +++ b/Documentation/ABI/testing/sysfs-block-zram > > @@ -121,3 +121,12 @@ Contact: Minchan Kim <minc...@kernel.org> > > The bd_stat file is read-only and represents backing device's > > statistics (bd_count, bd_reads, bd_writes) in a format > > similar to block layer statistics file format. > > + > > +What: /sys/block/zram<id>/writeback_limit > > +Date: November 2018 > > +Contact: Minchan Kim <minc...@kernel.org> > > +Description: > > + The writeback_limit file is read-write and specifies the maximum > > + amount of writeback ZRAM can do. The limit could be changed > > + in run time and "0" means disable the limit. > > + No limit is the initial state. > > diff --git a/Documentation/blockdev/zram.txt > > b/Documentation/blockdev/zram.txt > > index 906df97527a7..64b61925e475 100644 > > --- a/Documentation/blockdev/zram.txt > > +++ b/Documentation/blockdev/zram.txt > > @@ -164,6 +164,8 @@ reset WO trigger device reset > > mem_used_max WO reset the `mem_used_max' counter (see later) > > mem_limit WO specifies the maximum amount of memory ZRAM can use > > to store the compressed data > > +writeback_limit WO specifies the maximum amount of write IO zram can > > + write out to backing device as 4KB unit > ^^^^ > page size units?
Per andrew's comment: https://lkml.org/lkml/2018/11/27/156 I need to fix it to represent 4K always.
