Sleeper Fairness is a concept used by CFS which treat sleeping/waiting tasks as if they were in a run queue. This implies tasks which spend most of the time waiting for an user input and such will get a fair share of CPU when they need it. Disabling Gentle Fair Sleepers could improve UI responsiveness.
In suspend interrupts are disabled from 0 to NR_IRQ, in resume interrupts
should be enabled in reverse order.
Enabling parent or summary interrupts before enabling child interrupts
causes the handler of the child interrupt to run even before it is
enabled. Usually the genirq handler does the correct thing of masking
the interrupt and additionally marking the interrupt IRQ_PENDING if its
an edge triggered interrupt. However the nested handler
(handle_nested_irq()) simply ignores the interrupt causing a loss of it.
Not calling the action of an interrupt, especially if it marked wakeup,
causes the system to incorrectly go back to suspend immediately.
Change-Id: Ica30c10a975a4a7b41b97b4f21250dac80335b2b
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>
