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Integration of cpuidle with the scheduler requires that the idle loop be
closely integrated with the scheduler proper. Moving cpu/idle.c into the
sched directory will allow for a smoother integration, and eliminate a
subdirectory which contained only one source file.
Signed-off-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/alpine.LFD.2.11.1401301102210.1652@knanqh.ubzr
Signed-off-by: Ingo Molnar <mingo@kernel.org>
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cpu_idle_poll_ctrl provides a way of switching the
idle thread to use cpu_idle_poll instead of the arch
specific lower power mode callbacks (arch_cpu_idle).
cpu_idle_poll spins on a flag in a tight loop with
interrupts enabled.
In some cases it may be useful to enter the tight loop
polling mode only on a particular CPU. This allows
other CPUs to continue using the arch specific low
power mode callbacks. Provide an API that allows this.
Change-Id: I7c47c3590eb63345996a1c780faa79dbd1d9fdb4
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
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cpu_idle_poll_ctrl allows the enabling/disabling of the idle
polling mode; this mode allows a CPU to spin waiting for a
new task to be scheduled rather than having to execute the
arch specific idle code.
However, the loop that checks for a new task does not look
at the flag that enables idle polling mode. So, the CPU may
continue to spin even though the aforementioned flag has
been cleared. Since the CPU is already in idle, it may be
a while before a task is scheduled, precluding potential
power savings.
Modify the while loop conditional in question to also check
if the cpu_idle_force_poll flag is set.
Change-Id: Ia2e83af97890dc399b86e090459a41d31ce28b6c
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
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To ensure that CPUs see cpu_idle_force_poll flag
updates, add a memory barrier after writing to
the flag.
Change-Id: Ic3fdef7d17b673247bce5093530ce8aa08694632
Signed-off-by: Vikram Mulukutla <markivx@codeaurora.org>
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