Joel Fernandes 1ed33cf954 UPSTREAM: cpufreq: schedutil: Make iowait boost more energy efficient ... Currently the iowait_boost feature in schedutil makes the frequency go to max on iowait wakeups. This feature was added to handle a case that Peter described where the throughput of operations involving continuous I/O requests [1] is reduced due to running at a lower frequency, however the lower throughput itself causes utilization to be low and hence causing frequency to be low hence its "stuck". Instead of going to max, its also possible to achieve the same effect by ramping up to max if there are repeated in_iowait wakeups happening. This patch is an attempt to do that. We start from a lower frequency (policy->min) and double the boost for every consecutive iowait update until we reach the maximum iowait boost frequency (iowait_boost_max). I ran a synthetic test (continuous O_DIRECT writes in a loop) on an x86 machine with intel_pstate in passive mode using schedutil. In this test the iowait_boost value ramped from 800MHz to 4GHz in 60ms. The patch achieves the desired improved throughput as the existing behavior. [1] https://patchwork.kernel.org/patch/9735885/ Change-Id: I4a018434a50f4ca29ec15b03465f6dc212e54423 Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Cc: Len Brown <lenb@kernel.org> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Viresh Kumar <viresh.kumar@linaro.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Suggested-by: Peter Zijlstra <peterz@infradead.org> Suggested-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Joel Fernandes <joelaf@google.com>		2017-08-31 12:43:42 +00:00
..
bpf	This is the 4.4.78 stable release	2017-07-21 09:14:57 +02:00
configs	kconfig: tinyconfig: provide whole choice blocks to avoid warnings	2016-09-24 10:07:42 +02:00
debug	This is the 4.4.40 stable release	2017-01-09 10:12:25 -08:00
events	This is the 4.4.85 stable release	2017-08-30 14:35:43 +02:00
gcov
irq	genirq: Release resources in __setup_irq() error path	2017-06-26 07:13:10 +02:00
livepatch	livepatch: x86: fix relocation computation with kASLR	2015-11-11 17:36:04 +01:00
locking	UPSTREAM: locking: avoid passing around 'thread_info' in mutex debugging code	2017-08-14 14:32:46 +05:30
power	UPSTREAM: PM / sleep: make PM notifiers called symmetrically	2017-04-10 17:12:04 -07:00
printk	UPSTREAM: printk: when dumping regs, show the stack, not thread_info	2017-08-09 15:23:22 +01:00
rcu	This is the 4.4.37 stable release	2016-12-08 15:08:27 -08:00
sched	UPSTREAM: cpufreq: schedutil: Make iowait boost more energy efficient	2017-08-31 12:43:42 +00:00
time	This is the 4.4.79 stable release	2017-07-27 15:36:54 -07:00
trace	This is the 4.4.85 stable release	2017-08-30 14:35:43 +02:00
.gitignore
acct.c
async.c
audit.c	BACKPORT: audit: consistently record PIDs with task_tgid_nr()	2016-09-24 15:10:25 -07:00
audit.h	audit: audit_tree_match can be boolean	2015-11-04 08:23:51 -05:00
audit_fsnotify.c
audit_tree.c	audit: audit_tree_match can be boolean	2015-11-04 08:23:51 -05:00
audit_watch.c	audit: Fix use after free in audit_remove_watch_rule()	2017-08-24 17:02:35 -07:00
auditfilter.c	audit: fix comment block whitespace	2015-11-04 08:23:51 -05:00
auditsc.c	BACKPORT: audit: consistently record PIDs with task_tgid_nr()	2016-09-24 15:10:25 -07:00
backtracetest.c
bounds.c
capability.c	exec: Ensure mm->user_ns contains the execed files	2017-01-06 11:16:14 +01:00
cgroup.c	Revert "[RFC]cgroup: Change from CAP_SYS_NICE to CAP_SYS_RESOURCE for cgroup migration permissions"	2017-04-25 18:31:07 +00:00
cgroup_freezer.c	cgroup: fix handling of multi-destination migration from subtree_control enabling	2015-12-03 10:18:21 -05:00
cgroup_pids.c	cgroup_pids: don't account for the root cgroup	2015-12-03 10:18:21 -05:00
compat.c
configs.c
context_tracking.c	context_tracking: avoid irq_save/irq_restore on guest entry and exit	2015-11-10 12:06:23 +01:00
cpu.c	This is the 4.4.43 stable release	2017-01-17 12:44:14 -08:00
cpu_pm.c
cpuset.c	This is the 4.4.83 stable release	2017-08-16 14:05:33 -07:00
crash_dump.c
cred.c	cred: Reject inodes with invalid ids in set_create_file_as()	2016-09-15 08:27:49 +02:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	Merge remote-tracking branch 'common/android-4.4' into android-4.4.y	2016-09-13 14:47:50 -07:00
extable.c	kernel/extable.c: mark core_kernel_text notrace	2017-07-21 07:44:56 +02:00
fork.c	UPSTREAM: Clarify naming of thread info/stack allocators	2017-08-09 15:23:22 +01:00
freezer.c
futex.c	futex: Add missing error handling to FUTEX_REQUEUE_PI	2017-03-22 12:04:19 +01:00
futex_compat.c	BACKPORT: ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-07-07 16:30:43 -07:00
groups.c
hung_task.c
irq_work.c	treewide: Remove old email address	2015-11-23 09:44:58 +01:00
jump_label.c	jump_labels: API for flushing deferred jump label updates	2017-01-19 20:17:19 +01:00
kallsyms.c
kcmp.c	BACKPORT: ptrace: use fsuid, fsgid, effective creds for fs access checks	2016-07-07 16:30:43 -07:00
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kexec.c	kexec: use file name as the output message prefix	2015-11-06 17:50:42 -08:00
kexec_core.c	kexec: use file name as the output message prefix	2015-11-06 17:50:42 -08:00
kexec_file.c	kexec: fix double-free when failing to relocate the purgatory	2016-09-24 10:07:36 +02:00
kexec_internal.h
kmod.c	kmod: don't run async usermode helper as a child of kworker thread	2015-10-23 17:55:10 +09:00
kprobes.c	tracing/kprobes: Enforce kprobes teardown after testing	2017-05-25 14:30:17 +02:00
ksysfs.c
kthread.c	UPSTREAM: kthread: Pin the stack via try_get_task_stack()/put_task_stack() in to_live_kthread() function	2017-08-09 15:23:22 +01:00
latencytop.c
Makefile
membarrier.c	Fix: Disable sys_membarrier when nohz_full is enabled	2017-03-12 06:37:26 +01:00
memremap.c	mm: fix devm_memremap_pages crash, use mem_hotplug_{begin, done}	2017-01-19 20:17:18 +01:00
module-internal.h
module.c	module: Invalidate signatures on force-loaded modules	2016-08-20 18:09:27 +02:00
module_signing.c	KEYS: Merge the type-specific data with the payload data	2015-10-21 15:18:36 +01:00
notifier.c
nsproxy.c
padata.c	padata: free correct variable	2017-05-20 14:27:02 +02:00
panic.c	kernel/panic.c: add missing \n	2017-07-05 14:37:19 +02:00
params.c	Nothing exciting, minor tweaks and cleanups.	2015-11-09 15:53:39 -08:00
pid.c	pids: make task_tgid_nr_ns() safe	2017-08-24 17:02:36 -07:00
pid_namespace.c	pid_ns: Sleep in TASK_INTERRUPTIBLE in zap_pid_ns_processes	2017-05-25 14:30:11 +02:00
profile.c
ptrace.c	ptrace: Properly initialize ptracer_cred on fork	2017-06-14 13:16:20 +02:00
range.c
reboot.c
relay.c
resource.c	/proc/iomem: only expose physical resource addresses to privileged users	2017-08-06 19:19:42 -07:00
seccomp.c	seccomp: always propagate NO_NEW_PRIVS on tsync	2016-03-03 15:07:25 -08:00
signal.c	signal: protect SIGNAL_UNKILLABLE from unintentional clearing.	2017-08-11 09:08:59 -07:00
smp.c	mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd	2015-11-06 17:50:42 -08:00
smpboot.c
smpboot.h
softirq.c
stacktrace.c
stop_machine.c	kernel: remove stop_machine() Kconfig dependency	2015-12-12 10:15:34 -08:00
sys.c	This is the 4.4.16 stable release	2016-08-01 15:57:55 -07:00
sys_ni.c	mm: mlock: add new mlock system call	2015-11-05 19:34:48 -08:00
sysctl.c	This is the 4.4.77 stable release	2017-07-15 13:29:08 +02:00
sysctl_binary.c	fs/coredump: prevent fsuid=0 dumps into user-controlled directories	2016-04-12 09:08:58 -07:00
task_work.c
taskstats.c
test_kprobes.c
torture.c
tracepoint.c	tracepoint: Give priority to probes of tracepoints	2015-10-25 21:33:54 -04:00
tsacct.c
uid16.c
up.c
user-return-notifier.c
user.c
user_namespace.c
utsname.c
utsname_sysctl.c
watchdog.c	This is the 4.4.40 stable release	2017-01-09 10:12:25 -08:00
workqueue.c	workqueue: implicit ordered attribute should be overridable	2017-08-11 09:09:00 -07:00
workqueue_internal.h