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Prashanth Prakash 8b9951ed7e ARM64 / cpuidle: Use new cpuidle macro for entering retention state
CPU_PM_CPU_IDLE_ENTER_RETENTION skips calling cpu_pm_enter() and
cpu_pm_exit(). By not calling cpu_pm functions in idle entry/exit
paths we can reduce the latency involved in entering and exiting
the low power idle state.

On ARM64 based Qualcomm server platform we measured below overhead
for calling cpu_pm_enter and cpu_pm_exit for retention states.

workload: stress --hdd #CPUs --hdd-bytes 32M  -t 30
	Average overhead of cpu_pm_enter - 1.2us
	Average overhead of cpu_pm_exit  - 3.1us

Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Prashanth Prakash <pprakash@codeaurora.org>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
2018-01-02 13:50:34 +00:00
arch ARM64 / cpuidle: Use new cpuidle macro for entering retention state 2018-01-02 13:50:34 +00:00
block
certs
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Documentation ARM: SoC fixes for 4.15-rc 2017-12-10 08:26:59 -08:00
drivers perf: arm_spe: Fail device probe when arm64_kernel_unmapped_at_el0() 2017-12-11 13:41:13 +00:00
firmware
fs hpfs: don't bother with the i_version counter or f_version 2017-12-10 12:58:18 -08:00
include cpuidle: Add new macro to enter a retention idle state 2018-01-02 13:48:55 +00:00
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kernel futex: futex_wake_op, fix sign_extend32 sign bits 2017-12-10 12:50:57 -08:00
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virt arm64: allow ID map to be extended to 52 bits 2017-12-22 17:37:33 +00:00
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MAINTAINERS ARM: SoC fixes for 4.15-rc 2017-12-10 08:26:59 -08:00
Makefile Linux 4.15-rc3 2017-12-10 17:56:26 -08:00
README

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.