linux-kernel - Re: blk-mq : blk_mq_map

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Date:	Wed, 08 Apr 2015 11:22:01 +0800
From:	Chong Yuan <chong.yuan@...blaze.com>
To:	nimisolo <nimisolo@...yun.com>
CC:	axboe <axboe@...nel.dk>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: blk-mq : blk_mq_map_swqueue maybe

nimisolo,

在 4/8/2015 10:10 AM, nimisolo 写道:
> Hi Jens,
>
> In blk_mq_map_swqueue(), all the blk_mq_hw_ctx's  nr_ctx  are set
> to zero, and then each blk_mq_ctx's  index_hw  is set to nr_ctx.
> I think the index_hw means the index of the hardware queue that map
> to this software queue, so maybe index_hw should be set to
> blk_mq_hw_ctx's queue_num.

Multiple sw queues may be dispatched to one hw queue.
So index_hw here means the index of the sw queue in corresponding hw queue.

--yc


>
> I'm a student and I probably have misunderstood this code, please help
> me to resolve this confusion. Thank you.
>
> static void blk_mq_map_swqueue(struct request_queue *q)
> {
>          .........
>          queue_for_each_hw_ctx(q, hctx, i) {
>                  .........
>                  hctx->nr_ctx = 0;
>          }
>          .........
>          queue_for_each_ctx(q, ctx, i) {
>                  .........
>                  ctx->index_hw = hctx->nr_ctx;
>                  .........
>          }
> }
> --
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