diff options
Diffstat (limited to '')
| -rw-r--r-- | Documentation/admin-guide/blockdev/zram.rst | 25 |
1 files changed, 15 insertions, 10 deletions
diff --git a/Documentation/admin-guide/blockdev/zram.rst b/Documentation/admin-guide/blockdev/zram.rst index 3e11926a4df9..c73b16930449 100644 --- a/Documentation/admin-guide/blockdev/zram.rst +++ b/Documentation/admin-guide/blockdev/zram.rst @@ -315,8 +315,8 @@ To use the feature, admin should set up backing device via:: echo /dev/sda5 > /sys/block/zramX/backing_dev -before disksize setting. It supports only partition at this moment. -If admin wants to use incompressible page writeback, they could do via:: +before disksize setting. It supports only partitions at this moment. +If admin wants to use incompressible page writeback, they could do it via:: echo huge > /sys/block/zramX/writeback @@ -341,9 +341,14 @@ Admin can request writeback of those idle pages at right timing via:: echo idle > /sys/block/zramX/writeback -With the command, zram writeback idle pages from memory to the storage. +With the command, zram will writeback idle pages from memory to the storage. -If admin want to write a specific page in zram device to backing device, +Additionally, if a user choose to writeback only huge and idle pages +this can be accomplished with:: + + echo huge_idle > /sys/block/zramX/writeback + +If an admin wants to write a specific page in zram device to the backing device, they could write a page index into the interface. echo "page_index=1251" > /sys/block/zramX/writeback @@ -354,7 +359,7 @@ to guarantee storage health for entire product life. To overcome the concern, zram supports "writeback_limit" feature. The "writeback_limit_enable"'s default value is 0 so that it doesn't limit -any writeback. IOW, if admin wants to apply writeback budget, he should +any writeback. IOW, if admin wants to apply writeback budget, they should enable writeback_limit_enable via:: $ echo 1 > /sys/block/zramX/writeback_limit_enable @@ -365,7 +370,7 @@ until admin sets the budget via /sys/block/zramX/writeback_limit. (If admin doesn't enable writeback_limit_enable, writeback_limit's value assigned via /sys/block/zramX/writeback_limit is meaningless.) -If admin want to limit writeback as per-day 400M, he could do it +If admin wants to limit writeback as per-day 400M, they could do it like below:: $ MB_SHIFT=20 @@ -375,16 +380,16 @@ like below:: $ echo 1 > /sys/block/zram0/writeback_limit_enable If admins want to allow further write again once the budget is exhausted, -he could do it like below:: +they could do it like below:: $ echo $((400<<MB_SHIFT>>4K_SHIFT)) > \ /sys/block/zram0/writeback_limit -If admin wants to see remaining writeback budget since last set:: +If an admin wants to see the remaining writeback budget since last set:: $ cat /sys/block/zramX/writeback_limit -If admin want to disable writeback limit, he could do:: +If an admin wants to disable writeback limit, they could do:: $ echo 0 > /sys/block/zramX/writeback_limit_enable @@ -393,7 +398,7 @@ system reboot, echo 1 > /sys/block/zramX/reset) so keeping how many of writeback happened until you reset the zram to allocate extra writeback budget in next setting is user's job. -If admin wants to measure writeback count in a certain period, he could +If admin wants to measure writeback count in a certain period, they could know it via /sys/block/zram0/bd_stat's 3rd column. memory tracking |