Messages in this thread | | | From | Sergey Senozhatsky <> | Subject | [PATCHv5 00/10] add on-demand device creation | Date | Fri, 8 May 2015 21:15:43 +0900 |
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We currently don't support zram on-demand device creation. The only way to have N zram devices is to specify num_devices module parameter (default value 1). That means that if, for some reason, at some point, user wants to have N + 1 devies he/she must umount all the existing devices, unload the module, load the module passing num_devices equals to N + 1.
This patchset introduces zram-control sysfs class, which has two sysfs attrs:
- hot_add -- add a new zram device - hot_remove -- remove a specific (device_id) zram device
Usage example: # add a new specific zram device cat /sys/class/zram-control/hot_add 1
# remove a specific zram device echo 4 > /sys/class/zram-control/hot_remove
V5: -- rename zram_add/zram_remove to hot_add/hot_remove (per Minchan's request)
V4: -- add patch from Minchan to handle differently a deadlock suspected by lockdep -- use zram->claim in zram_remove()
V3: -- rebase against 4.1 -- review comments from Minchan were addressed -- no sysfs RO tricks anymore
V2: -- quick rebase and cleanup in attempt to catch 4.1 merge window
Minchan Kim (1): zram: close race by open overriding
Sergey Senozhatsky (9): zram: add `compact` sysfs entry to documentation zram: cosmetic ZRAM_ATTR_RO code formatting tweak zram: use idr instead of `zram_devices' array zram: reorganize code layout zram: remove max_num_devices limitation zram: report every added and removed device zram: trivial: correct flag operations comment zram: return zram device_id from zram_add() zram: add dynamic device add/remove functionality
Documentation/ABI/testing/sysfs-class-zram | 24 + Documentation/blockdev/zram.txt | 29 +- drivers/block/zram/zram_drv.c | 1004 ++++++++++++++++------------ drivers/block/zram/zram_drv.h | 10 +- 4 files changed, 614 insertions(+), 453 deletions(-) create mode 100644 Documentation/ABI/testing/sysfs-class-zram
-- 2.4.0
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