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* null_blk: add an usage for shared tags in documentationMinwoo Im2017-11-071-0/+5
| | | | | | | | | | | | Add usage explanation for a shared_tags, introduced by commit: 82f402fefa50 ("null_blk: add support for shared tags") Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com> Reworded slightly. Signed-off-by: Jens Axboe <axboe@kernel.dk>
* null_blk: fix default values in documentationMinwoo Im2017-11-071-2/+2
| | | | | | | | | | null_blk.c has initial value of (1) nr_devices as 1. (2) completion_nsec as 10,000ns, not 10.000ns. documentation should be updated for fixes above. Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
* null_blk: add usage hints for no_schedweiping zhang2017-10-131-0/+4
| | | | | | | | This parameter provide an option to disable io scheduler when nullb* in multi-queue mode. Signed-off-by: weiping zhang <zhangweiping@didichuxing.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
* null_blk: update usage hints for submit_queuesweiping zhang2017-10-131-3/+3
| | | | | | | update the range of submits_queues, and correct usage hints. Signed-off-by: weiping zhang <zhangweiping@didichuxing.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
* null_blk: add usage hints for NVMYasuaki Ishimatsu2016-11-161-1/+1
| | | | | | | | | | | | | If CONFIG_NVM is disabled, loading null_block module with use_lightnvm=1 fails. But there are no messages and documents related to the failure. Add the appropriate error message. Signed-off-by: Yasuaki Ishimatsu <isimatu.yasuaki@jp.fujitsu.com> Massaged the text a bit. Signed-off-by: Jens Axboe <axboe@fb.com>
* null_blk: register as a LightNVM deviceMatias Bjørling2015-11-161-0/+3
| | | | | | | | | | | | | | Add support for registering as a LightNVM device. This allows us to evaluate the performance of the LightNVM subsystem. In /drivers/Makefile, LightNVM is moved above block device drivers to make sure that the LightNVM media managers have been initialized before drivers under /drivers/block are initialized. Signed-off-by: Matias Bjørling <m@bjorling.me> Fix by Jens Axboe to remove unneeded slab cache and the following memory leak. Signed-off-by: Jens Axboe <axboe@fb.com>
* Documentation: Fix null_blk parameter irq_mode to irqmodeFam Zheng2014-08-261-2/+2
| | | | | | | To match the real module parameter name we implemented. Signed-off-by: Fam Zheng <famz@redhat.com> Signed-off-by: Jiri Kosina <jkosina@suse.cz>
* null_blk: set use_per_node_hctx param to falseMatias Bjørling2013-12-211-4/+5
| | | | | | | | | | The defaults for the module is to instantiate itself with blk-mq and a submit queue for each CPU node in the system. To save resources, initialize instead with a single submit queue. Signed-off-by: Matias Bjorling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@kernel.dk>
* null_blk: corrections to documentationMatias Bjørling2013-12-211-10/+10
| | | | | | | | | Randy Dunlap reported a couple of grammar errors and unfortunate usages of socket/node/core. Signed-off-by: Matias Bjorling <m@bjorling.me> Acked-by: Randy Dunlap <rdunlap@infradead.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
* null_blk: documentationMatias Bjorling2013-12-191-0/+71
Add description of module and its parameters. Signed-off-by: Matias Bjorling <m@bjorling.me> Signed-off-by: Jens Axboe <axboe@kernel.dk>