* dma_map_sg_attrs() time consumption not consistent
@ 2019-10-02 14:12 Bean Huo (beanhuo)
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From: Bean Huo (beanhuo) @ 2019-10-02 14:12 UTC (permalink / raw)
To: dmaengine; +Cc: Bean Huo (beanhuo)
Hi,
Recently, I experienced a problem on scaterlist DMA mappping. It is said that if mapping 128KB data length for DMA tranfer,
when I enable jbd2, dma_map_sg_attrs() will take more thant two times of time, comparing to the condition which jbd2 disabled.
Somebody suggested me to print out DMA entry to look at what happening. I studied dma_map_sg_attrs() funciton a little bit,
But don't much clear how to print this kind of info. Is there anyone who knows this?
Thanks.
//Bean
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