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linux-sg2042/include/linux/sched
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Quentin Perret 938e5e4b0d sched/cpufreq: Prepare schedutil for Energy Aware Scheduling 
Schedutil requests frequency by aggregating utilization signals from
the scheduler (CFS, RT, DL, IRQ) and applying a 25% margin on top of
them. Since Energy Aware Scheduling (EAS) needs to be able to predict
the frequency requests, it needs to forecast the decisions made by the
governor.

In order to prepare the introduction of EAS, introduce
schedutil_freq_util() to centralize the aforementioned signal
aggregation and make it available to both schedutil and EAS. Since
frequency selection and energy estimation still need to deal with RT and
DL signals slightly differently, schedutil_freq_util() is called with a
different 'type' parameter in those two contexts, and returns an
aggregated utilization signal accordingly. While at it, introduce the
map_util_freq() function which is designed to make schedutil's 25%
margin usable easily for both sugov and EAS.

As EAS will be able to predict schedutil's frequency requests more
accurately than any other governor by design, it'd be sensible to make
sure EAS cannot be used without schedutil. This will be done later, once
EAS has actually been introduced.

Suggested-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Quentin Perret <quentin.perret@arm.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: adharmap@codeaurora.org
Cc: chris.redpath@arm.com
Cc: currojerez@riseup.net
Cc: dietmar.eggemann@arm.com
Cc: edubezval@gmail.com
Cc: gregkh@linuxfoundation.org
Cc: javi.merino@kernel.org
Cc: joel@joelfernandes.org
Cc: juri.lelli@redhat.com
Cc: morten.rasmussen@arm.com
Cc: patrick.bellasi@arm.com
Cc: pkondeti@codeaurora.org
Cc: rjw@rjwysocki.net
Cc: skannan@codeaurora.org
Cc: smuckle@google.com
Cc: srinivas.pandruvada@linux.intel.com
Cc: thara.gopinath@linaro.org
Cc: tkjos@google.com
Cc: valentin.schneider@arm.com
Cc: vincent.guittot@linaro.org
Cc: viresh.kumar@linaro.org
Link: https://lkml.kernel.org/r/20181203095628.11858-3-quentin.perret@arm.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
 		2018-12-11 15:16:58 +01:00
..
autogroup.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
clock.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
coredump.h mm, oom_reaper: fix memory corruption 2017-12-14 16:00:49 -08:00
cpufreq.h sched/cpufreq: Prepare schedutil for Energy Aware Scheduling 2018-12-11 15:16:58 +01:00
cputime.h Merge branch 'for-4.15' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup 2017-11-15 14:29:44 -08:00
deadline.h sched/headers: Simplify and clean up header usage in the scheduler 2018-03-04 12:39:29 +01:00
debug.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
hotplug.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
idle.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
init.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
isolation.h sched: Fix various typos in comments 2018-12-03 11:55:42 +01:00
jobctl.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
loadavg.h sched: loadavg: make calc_load_n() public 2018-10-26 16:26:32 -07:00
mm.h sched: Fix various typos in comments 2018-12-03 11:55:42 +01:00
nohz.h sched/nohz: Clean up nohz enter/exit 2018-03-09 07:59:19 +01:00
numa_balancing.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
prio.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
rt.h Merge branch 'linus' into sched/core, to pick up fixes 2017-11-08 10:17:15 +01:00
signal.h signal: Distinguish between kernel_siginfo and siginfo 2018-10-03 16:47:43 +02:00
smt.h x86/speculation: Rework SMT state change 2018-11-28 11:57:07 +01:00
stat.h sched: Fix various typos in comments 2018-12-03 11:55:42 +01:00
sysctl.h kernel/hung_task.c: allow to set checking interval separately from timeout 2018-08-22 10:52:47 -07:00
task.h alpha: fix osf_wait4() breakage 2018-07-22 11:51:30 -07:00
task_stack.h sched/headers: Constify object_is_on_stack() 2017-12-06 20:50:02 +01:00
topology.h sched/topology: Relocate arch_scale_cpu_capacity() to the internal header 2018-12-11 15:16:58 +01:00
user.h userns: use refcount_t for reference counting instead atomic_t 2018-08-22 10:52:46 -07:00
wake_q.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xacct.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00