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| author |   Chong Yuan <chong.yuan@memblaze.com> | 2015-04-15 11:39:29 -0600 |
|---|---|---|
| committer |   Jens Axboe <axboe@fb.com> | 2015-04-15 11:39:29 -0600 |
| commit | 889fa31f00b218a2cef96c32a6b3f57e6d3bf918 (patch) | |
| tree | 12338bd403f6fd84d8e2b98624aceaa3a4b9998b /fs/aio.c | |
| parent | aio: fix serial draining in exit_aio() (diff) | |
| download | linux-dev-889fa31f00b218a2cef96c32a6b3f57e6d3bf918.tar.xz linux-dev-889fa31f00b218a2cef96c32a6b3f57e6d3bf918.zip | |
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>
Diffstat (limited to 'fs/aio.c')
0 files changed, 0 insertions, 0 deletions