[Question] PM-QoS: PM_QOS_CPU_DMA_LATENCY == interrupt latency?

[Ming Lei]

Hi,

Looks like it is a bit difficult to understand PM_QOS_CPU_DMA_LATENCY
from the words' meaning.

After searching from google, I don't find some useful information about
the root cause for introducing PM_QOS_CPU_DMA_LATENCY. I understand
it is very similar to interrupt latency. Also from the comment for
omap_pm_set_max_mpu_wakeup_lat in file[1], the description is basically same
with interrupt latency.

>From comments of pm_qos_add_request usages in drivers, it can be understood
as interrupt latency too, IMO.

So, could we think that PM_QOS_CPU_DMA_LATENCY is interrupt latency?


[1], arch/arm/plat-omap/include/plat/omap-pm.h

thanks,
-- 
Ming Lei
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