Daniel Lezcano bbba0e7c5c genirq/timings: Add array suffix computation code ... The previous approach based on the variance was discarding values from the timings when they were considered as anomalies as stated by the normal law statistical model. However in the interrupt life, there can be multiple anomalies due to the nature of the device generating the interrupts, and most of the time a repeating pattern can be observed, that is particulary true for network, console, MMC or SSD devices. The variance approach missed the patterns and it was only able to deal with the interrupt coming in regular intervals, thus reducing considerably the scope of what is predictable. In order to find out the repeating patterns, the interrupt intervals are grouped in a ilog2 basis to create a suite of numbers with small amplitude. Every group contains an exponential moving average of the values belonging to the group. The array suffix, a data structure used for string searching, data compression, etc ..., is built from the suite of numbers and the suffixes are then searched in this suite. The tests showed the algorithm is able to find all repeating patterns, as well as regular interval in less than 1us on x86-i7. Signed-off-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: rjw@rjwysocki.net Cc: ulf.hansson@linaro.org Cc: linux-pm@vger.kernel.org Link: https://lkml.kernel.org/r/20190328151336.5316-2-daniel.lezcano@linaro.org		2019-04-05 22:51:29 +02:00
..
bpf	Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net	2019-03-11 08:54:01 -07:00
cgroup	Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-03-12 14:08:19 -07:00
configs
debug	kdb: use bool for binary state indicators	2018-12-30 08:31:52 +00:00
dma	memblock: drop memblock_alloc_*_nopanic() variants	2019-03-12 10:04:02 -07:00
events	perf/core improvements and fixes:	2019-03-22 22:50:41 +01:00
gcov	kernel/gcov/gcc_3_4.c: use struct_size() in kzalloc()	2019-03-07 18:32:02 -08:00
irq	genirq/timings: Add array suffix computation code	2019-04-05 22:51:29 +02:00
livepatch	Merge branch 'for-5.1/atomic-replace' into for-linus	2019-03-05 15:56:59 +01:00
locking	locking/lockdep: Only call init_rcu_head() after RCU has been initialized	2019-03-09 14:15:51 +01:00
power	treewide: add checks for the return value of memblock_alloc*()	2019-03-12 10:04:02 -07:00
printk	fbdev changes for v5.1:	2019-03-15 14:22:59 -07:00
rcu	Merge branch 'perf-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-03-06 07:59:36 -08:00
sched	Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2019-03-24 11:42:10 -07:00
time	time/jiffies: Make refined_jiffies static	2019-03-22 13:38:26 +01:00
trace	for-5.1/block-post-20190315	2019-03-16 12:36:39 -07:00
.gitignore	kernel/configs: use .incbin directive to embed config_data.gz	2019-03-07 18:32:02 -08:00
acct.c
async.c	async: Add support for queueing on specific NUMA node	2019-01-31 14:20:54 +01:00
audit_fsnotify.c	audit: add syscall information to CONFIG_CHANGE records	2019-01-18 17:53:29 -05:00
audit_tree.c	audit: hand taken context to audit_kill_trees for syscall logging	2019-01-14 18:01:05 -05:00
audit_watch.c	audit: add syscall information to CONFIG_CHANGE records	2019-01-18 17:53:29 -05:00
audit.c	audit: remove audit_context when CONFIG_ AUDIT and not AUDITSYSCALL	2019-02-03 17:49:35 -05:00
audit.h	audit: hide auditsc_get_stamp and audit_serial prototypes	2019-02-07 21:44:27 -05:00
auditfilter.c	audit: mark expected switch fall-through	2019-02-12 20:17:13 -05:00
auditsc.c	audit: remove audit_context when CONFIG_ AUDIT and not AUDITSYSCALL	2019-02-03 17:49:35 -05:00
backtracetest.c
bounds.c
capability.c	LSM: add SafeSetID module that gates setid calls	2019-01-25 11:22:43 -08:00
compat.c	time: make adjtime compat handling available for 32 bit	2019-02-07 00:13:27 +01:00
configs.c	kernel/configs: use .incbin directive to embed config_data.gz	2019-03-07 18:32:02 -08:00
context_tracking.c
cpu_pm.c
cpu.c	Linux 5.0-rc5	2019-02-04 08:57:24 +01:00
crash_core.c	kexec: export PG_offline to VMCOREINFO	2019-03-05 21:07:14 -08:00
crash_dump.c
cred.c	SELinux: Remove cred security blob poisoning	2019-01-08 13:18:44 -08:00
delayacct.c
dma.c
elfcore.c
exec_domain.c
exit.c	Merge branch 'for-5.1' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup	2019-03-07 10:11:41 -08:00
extable.c
fail_function.c
fork.c	5.1 Merge Window Pull Request	2019-03-09 15:53:03 -08:00
freezer.c
futex.c	futex: Ensure that futex address is aligned in handle_futex_death()	2019-03-22 13:05:26 +01:00
groups.c
hung_task.c	kernel/hung_task.c: Use continuously blocked time when reporting.	2019-03-07 18:31:59 -08:00
iomem.c
irq_work.c
jump_label.c	jump_label: move 'asm goto' support test to Kconfig	2019-01-06 09:46:51 +09:00
kallsyms.c	bpf: Add module name [bpf] to ksymbols for bpf programs	2019-01-21 17:38:56 -03:00
kcmp.c
Kconfig.freezer
Kconfig.hz
Kconfig.locks	bpf: introduce bpf_spin_lock	2019-02-01 20:55:38 +01:00
Kconfig.preempt	kconfig: warn no new line at end of file	2018-12-15 17:44:35 +09:00
kcov.c	kcov: convert kcov.refcount to refcount_t	2019-03-07 18:32:02 -08:00
kexec_core.c	mm: convert totalram_pages and totalhigh_pages variables to atomic	2018-12-28 12:11:47 -08:00
kexec_file.c
kexec_internal.h
kexec.c
kmod.c
kprobes.c	kprobes: Search non-suffixed symbol in blacklist	2019-02-13 08:16:40 +01:00
ksysfs.c
kthread.c	Merge branch 'akpm' (patches from Andrew)	2019-03-06 10:31:36 -08:00
latencytop.c
Makefile	kernel/configs: use .incbin directive to embed config_data.gz	2019-03-07 18:32:02 -08:00
memremap.c	mm/hmm: fix memremap.h, move dev_page_fault_t callback to hmm	2018-12-28 12:11:52 -08:00
module_signing.c
module-internal.h
module.c	dynamic_debug: add static inline stub for ddebug_add_module	2019-03-07 18:32:00 -08:00
notifier.c
nsproxy.c
padata.c
panic.c	kernel/panic.c: taint: fix debugfs_simple_attr.cocci warnings	2019-03-07 18:31:59 -08:00
params.c
pid_namespace.c
pid.c	Fix failure path in alloc_pid()	2018-12-28 12:42:30 -08:00
profile.c
ptrace.c	Remove 'type' argument from access_ok() function	2019-01-03 18:57:57 -08:00
range.c
reboot.c
relay.c	Merge branch 'work.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs	2019-03-12 13:27:20 -07:00
resource.c	device-dax for 5.1	2019-03-16 13:05:32 -07:00
rseq.c	Remove 'type' argument from access_ok() function	2019-01-03 18:57:57 -08:00
seccomp.c	Merge branch 'next-general' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security	2019-03-07 11:44:01 -08:00
signal.c	pidfd patches for v5.1-rc1	2019-03-16 13:47:14 -07:00
smp.c	cpu/hotplug: Fix "SMT disabled by BIOS" detection for KVM	2019-01-30 19:27:00 +01:00
smpboot.c
smpboot.h
softirq.c	softirq: Don't skip softirq execution when softirq thread is parking	2019-02-10 21:51:39 +01:00
stackleak.c
stacktrace.c
stop_machine.c
sys_ni.c	pidfd patches for v5.1-rc1	2019-03-16 13:47:14 -07:00
sys.c	Merge branch 'akpm' (patches from Andrew)	2019-03-07 19:25:37 -08:00
sysctl_binary.c	kernel/sysctl: add panic_print into sysctl	2019-01-04 13:13:47 -08:00
sysctl.c	kernel/sysctl.c: define minmax conv functions in terms of non-minmax versions	2019-03-12 10:04:00 -07:00
task_work.c
taskstats.c
test_kprobes.c
torture.c	Merge branches 'doc.2019.01.26a', 'fixes.2019.01.26a', 'sil.2019.01.26a', 'spdx.2019.02.09a', 'srcu.2019.01.26a' and 'torture.2019.01.26a' into HEAD	2019-02-09 08:47:52 -08:00
tracepoint.c
tsacct.c
ucount.c
uid16.c
uid16.h
umh.c	umh: add exit routine for UMH process	2019-01-11 18:05:40 -08:00
up.c
user_namespace.c
user-return-notifier.c
user.c
utsname_sysctl.c
utsname.c
watchdog_hld.c
watchdog.c	watchdog/core: Make variables static	2019-03-22 13:40:17 +01:00
workqueue_internal.h	psi: fix aggregation idle shut-off	2019-02-01 15:46:23 -08:00
workqueue.c	workqueue: Only unregister a registered lockdep key	2019-03-21 12:00:18 +01:00