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Filename Latest commit message Latest commit date
Matt Wagantall c481c78661 trace: cpu_freq_switch: Add profiler for CPU frequency switch times 
It is sometimes useful to profile how long CPU frequency switches
take, and traces have already been added for this purpose. Make
use of these and the trace_stat framework to generate statistical
histograms of frequency switch times in the following format:

 # cat /sys/kernel/debug/tracing/trace_stat/cpu_freq_switch
  CPU START_KHZ  END_KHZ COUNT AVG_US MIN_US MAX_US
    |         |        |     |      |      |      |
    0    384000  1512000     3   2787   1648   3418
    0    486000   384000     1   1129   1129   1129
    0   1458000   384000     1   3174   3174   3174
    0   1512000   384000     1   3265   3265   3265
    0   1512000   486000     1   3235   3235   3235
    0   1512000  1458000     1    213    213    213
    0   1512000  1512000     1      0      0      0

Profiling is disabled by default (since it does incur some
overhead). It can be enabled or re-disabled echoing 1 or 0
to /sys/kernel/debug/tracing/cpu_freq_switch_profile_enabled

Change-Id: I3ef7f9d681b7bd13bcaa031003b10312afe1aefe
Signed-off-by: Matt Wagantall <mattw@codeaurora.org>
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
2017-03-20 12:16:04 -07:00
..
bpf bpf: fix states equal logic for varlen access 2016-11-30 14:50:52 -05:00
configs Merge remote-tracking branch 'origin/tmp-dcb6110' into 4.8 2017-02-17 16:14:38 -08:00
debug This is the 4.9.6 stable release 2017-01-31 13:55:27 -08:00
events Merge remote-tracking branch '4.9/tmp-0455ac9' into 4.9 2017-03-06 15:50:56 -08:00
gcov gcov: add support for gcc version >= 6 2016-07-15 14:54:27 +09:00
irq Merge remote-tracking branch 'origin/tmp-dcb6110' into 4.8 2017-02-17 16:14:38 -08:00
livepatch livepatch/module: make TAINT_LIVEPATCH module-specific 2016-08-26 14:42:08 +02:00
locking Merge remote-tracking branch 'origin/tmp-69973b8' into msm-4.8 2016-12-12 10:21:46 -08:00
power Merge remote-tracking branch 'origin/tmp-dcb6110' into 4.8 2017-02-17 16:14:38 -08:00
printk Merge branch 'upstream-linux-4.9.y' into android-4.9 2017-02-23 14:29:44 -08:00
rcu kernel: rcu: Panic on RCU stall 2017-03-15 11:49:57 -07:00
sched ANDROID: sched/walt: Fix missing locking in WALT port 2017-03-13 17:10:35 -07:00
time timer: Fix incorrect parenthesis in timer 2017-03-13 17:11:21 -07:00
trace trace: cpu_freq_switch: Add profiler for CPU frequency switch times 2017-03-20 12:16:04 -07:00
.gitignore
acct.c
async.c
audit.c Merge branch 'stable-4.9' of git://git.infradead.org/users/pcmoore/audit 2016-10-04 14:21:41 -07:00
audit.h Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit 2016-07-29 17:54:17 -07:00
audit_fsnotify.c
audit_tree.c audit: cleanup prune_tree_thread 2016-04-04 09:46:47 -04:00
audit_watch.c Merge branch 'stable-4.8' of git://git.infradead.org/users/pcmoore/audit 2016-09-01 15:55:56 -07:00
auditfilter.c audit: add fields to exclude filter by reusing user filter 2016-06-27 11:01:00 -04:00
auditsc.c Merge branch 'stable-4.9' of git://git.infradead.org/users/pcmoore/audit 2016-10-04 14:21:41 -07:00
backtracetest.c
bounds.c
capability.c ptrace: Capture the ptracer's creds not PT_PTRACE_CAP 2017-01-06 10:40:13 +01:00
cgroup.c Merge remote-tracking branch 'origin/tmp-dcb6110' into 4.8 2017-02-17 16:14:38 -08:00
cgroup_freezer.c
cgroup_pids.c cgroup: Use lld instead of ld when printing pids controller events_limit 2016-06-21 15:03:36 -04:00
compat.c
configs.c
context_tracking.c
cpu.c Merge remote-tracking branch 'origin/tmp-dcb6110' into 4.8 2017-02-17 16:14:38 -08:00
cpu_pm.c lpm-levels: Do not disable non-sec interrupts in suspend 2017-02-23 10:43:32 -07:00
cpuset.c ANDROID: cpuset: Make cpusets restore on hotplug 2017-01-27 13:55:27 -08:00
crash_dump.c
cred.c cred: Reject inodes with invalid ids in set_create_file_as() 2016-06-30 18:05:09 -05:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c ANDROID: FIXUP: sched/tune: fix accounting for runnable tasks 2017-01-31 10:46:56 -08:00
extable.c
fork.c Merge remote-tracking branch 'origin/tmp-dcb6110' into 4.8 2017-02-17 16:14:38 -08:00
freezer.c freezer, oom: check TIF_MEMDIE on the correct task 2016-07-28 16:07:41 -07:00
futex.c futex: Move futex_init() to core_initcall 2017-02-23 17:44:36 +01:00
futex_compat.c
groups.c cred: simpler, 1D supplementary groups 2016-10-07 18:46:30 -07:00
hung_task.c hung_task: allow hung_task_panic when hung_task_warnings is 0 2016-10-11 15:06:33 -07:00
irq_work.c
jump_label.c jump_labels: API for flushing deferred jump label updates 2017-01-19 20:17:59 +01:00
kallsyms.c kallsyms: add support for relative offsets in kallsyms address table 2016-03-15 16:55:16 -07:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks
Kconfig.preempt
kcov.c kcov: add missing #include <linux/sched.h> 2016-12-07 17:10:00 -08:00
kexec.c kexec: allow architectures to override boot mapping 2016-08-02 19:35:27 -04:00
kexec_core.c kexec: add restriction on kexec_load() segment sizes 2016-08-02 19:35:31 -04:00
kexec_file.c kexec: fix double-free when failing to relocate the purgatory 2016-09-01 17:52:01 -07:00
kexec_internal.h
kmod.c
kprobes.c kprobes: include <asm/sections.h> instead of <asm-generic/sections.h> 2016-10-11 15:06:31 -07:00
ksysfs.c kexec: add a kexec_crash_loaded() function 2016-08-02 19:35:30 -04:00
kthread.c kthread: better support freezable kthread workers 2016-10-11 15:06:33 -07:00
latencytop.c
Makefile userns: Add per user namespace sysctls. 2016-08-08 13:18:58 -05:00
membarrier.c Fix: Disable sys_membarrier when nohz_full is enabled 2017-03-12 06:41:45 +01:00
memremap.c mm, devm_memremap_pages: hold device_hotplug lock over mem_hotplug_{begin, done} 2017-03-12 06:41:43 +01:00
module-internal.h
module.c Re-enable CONFIG_MODVERSIONS in a slightly weaker form 2016-11-29 16:01:30 -08:00
module_signing.c KEYS: Move the point of trust determination to __key_link() 2016-04-11 22:43:43 +01:00
notifier.c
nsproxy.c
padata.c padata: Convert to hotplug state machine 2016-09-19 21:44:30 +02:00
panic.c x86/panic: replace smp_send_stop() with kdump friendly version in panic path 2016-10-11 15:06:32 -07:00
params.c
pid.c Use after free from pid_nr_ns() 2017-02-15 17:40:08 -08:00
pid_namespace.c pid: fix lockdep deadlock warning due to ucount_lock 2017-01-19 20:18:03 +01:00
profile.c profile: Convert to hotplug state machine 2016-07-15 10:41:42 +02:00
ptrace.c ptrace: Don't allow accessing an undumpable mm 2017-01-06 10:40:13 +01:00
range.c
reboot.c
relay.c relay: check array offset before using it 2017-01-12 11:39:30 +01:00
resource.c /proc/iomem: only expose physical resource addresses to privileged users 2016-04-14 12:56:09 -07:00
seccomp.c seccomp: Fix tracer exit notifications during fatal signals 2016-08-30 16:12:46 -07:00
signal.c sigaltstack: support SS_AUTODISARM for CONFIG_COMPAT 2017-03-12 06:41:44 +01:00
smp.c smp: Do not wake up all idle CPUs 2017-02-07 14:50:30 -08:00
smpboot.c sched: Add per CPU load tracking for each task 2017-02-07 14:50:51 -08:00
smpboot.h cpu/hotplug: Create hotplug threads 2016-03-01 20:36:56 +01:00
softirq.c softirq: Display IRQ_POLL for irq-poll statistics 2016-10-21 15:45:47 -06:00
stacktrace.c stacktrace, lockdep: Fix address, newline ugliness 2017-02-14 15:25:42 -08:00
stop_machine.c Merge branch 'sched-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip 2016-10-03 13:39:00 -07:00
sys.c ANDROID: mm: add a field to store names for private anonymous memory 2017-01-27 13:52:21 -08:00
sys_ni.c x86/pkeys: Fix pkeys build breakage for some non-x86 arches 2016-09-13 14:41:36 +02:00
sysctl.c Merge remote-tracking branch 'origin/tmp-dcb6110' into 4.8 2017-02-17 16:14:38 -08:00
sysctl_binary.c sysctl: add cold_boot sysctl entry 2017-01-11 13:57:41 -08:00
task_work.c task_work: use READ_ONCE/lockless_dereference, avoid pi_lock if !task_works 2016-08-02 19:35:02 -04:00
taskstats.c taskstats: fix the length of cgroupstats_cmd_get_policy 2016-11-03 16:55:58 -04:00
test_kprobes.c
torture.c torture: Convert torture_shutdown() to hrtimer 2016-08-22 10:01:49 -07:00
tracepoint.c kernel/...: convert pr_warning to pr_warn 2016-03-22 15:36:02 -07:00
tsacct.c time, acct: Drop irq save & restore from __acct_update_integrals() 2016-02-29 09:53:09 +01:00
ucount.c userns: Make ucounts lock irq-safe 2017-02-01 08:33:05 +01:00
uid16.c cred: simpler, 1D supplementary groups 2016-10-07 18:46:30 -07:00
up.c smp: Add function to execute a function synchronously on a CPU 2016-09-05 13:52:39 +02:00
user-return-notifier.c
user.c
user_namespace.c Merge branch 'nsfs-ioctls' into HEAD 2016-09-22 20:00:36 -05:00
utsname.c Merge branch 'nsfs-ioctls' into HEAD 2016-09-22 20:00:36 -05:00
utsname_sysctl.c
watchdog.c watchdog: Induce non secure watchdog bite for lockup 2017-03-08 11:16:41 -08:00
workqueue.c workqueue: fix possible livelock with concurrent mod_delayed_work() 2017-02-21 10:32:46 -08:00
workqueue_internal.h sched/core: Get rid of 'cpu' argument in wq_worker_sleeping() 2016-03-02 10:28:47 -05:00