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authorChong Yuan <chong.yuan@memblaze.com>2015-04-15 11:39:29 -0600
committerJens Axboe <axboe@fb.com>2015-04-15 11:39:29 -0600
commit889fa31f00b218a2cef96c32a6b3f57e6d3bf918 (patch)
tree12338bd403f6fd84d8e2b98624aceaa3a4b9998b /fs/aio.c
parentdc48e56d761610da4ea1088d1bea0a030b8e3e43 (diff)
blk-mq: reduce unnecessary software queue looping
In flush_busy_ctxs() and blk_mq_hctx_has_pending(), regardless of how many ctxs assigned to one hctx, they will all loop hctx->ctx_map.map_size times. Here hctx->ctx_map.map_size is a const ALIGN(nr_cpu_ids, 8) / 8. Especially, flush_busy_ctxs() is in hot code path. And it's unnecessary. Change ->map_size to contain the actually mapped software queues, so we only loop for as many iterations as we have to. And remove cpumask setting and nr_ctx count in blk_mq_init_cpu_queues() since they are all re-done in blk_mq_map_swqueue(). blk_mq_map_swqueue(). Signed-off-by: Chong Yuan <chong.yuan@memblaze.com> Reviewed-by: Wenbo Wang <wenbo.wang@memblaze.com> Updated by me for formatting and commenting. Signed-off-by: Jens Axboe <axboe@fb.com>
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