Function report |
Source Code:block\blk-mq.c |
Create Date:2022-07-28 17:09:35 |
Last Modify:2020-03-17 23:18:05 | Copyright©Brick |
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Name:Update dispatch busy with the Exponential Weighted Moving Average(EWMA):* - EWMA is one simple way to compute running average value* - weight(7/8 and 1/8) is applied so that it can decrease exponentially* - take 4 as factor for avoiding to get too
Proto:static void blk_mq_update_dispatch_busy(struct blk_mq_hw_ctx *hctx, bool busy)
Type:void
Parameter:
Type | Parameter | Name |
---|---|---|
struct blk_mq_hw_ctx * | hctx | |
bool | busy |
1155 | If elevator Then Return |
1158 | ewma = @dispatch_busy: Number used by blk_mq_update_dispatch_busy() to* decide if the hw_queue is busy using Exponential Weighted Moving* Average algorithm. |
1163 | ewma *= BLK_MQ_DISPATCH_BUSY_EWMA_WEIGHT - 1 |
1164 | If busy Then ewma += 1 << BLK_MQ_DISPATCH_BUSY_EWMA_FACTOR |
1166 | ewma /= BLK_MQ_DISPATCH_BUSY_EWMA_WEIGHT |
1168 | @dispatch_busy: Number used by blk_mq_update_dispatch_busy() to* decide if the hw_queue is busy using Exponential Weighted Moving* Average algorithm. = ewma |
Name | Describe |
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blk_mq_dispatch_rq_list | Returns true if we did some work AND can potentially do more. |
__blk_mq_issue_directly |
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