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由 Valdis Kletnieks 提交于
We added the ability to change a block device's IO elevator scheduler both at kernel boot and on-the-fly, but we only documented the elevator= boot parameter. Add a quick how-to on doing it on the fly. Signed-off-by: NValdis Kletnieks <valdis.kletnieks@vt.edu> Signed-off-by: NAndrew Morton <akpm@osdl.org> Signed-off-by: NJens Axboe <axboe@suse.de>
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