Frederic Weisbecker
d027d45d8a
nohz: New tick dependency mask ...
The tick dependency is evaluated on every IRQ and context switch. This
consists is a batch of checks which determine whether it is safe to
stop the tick or not. These checks are often split in many details:
posix cpu timers, scheduler, sched clock, perf events.... each of which
are made of smaller details: posix cpu timer involves checking process
wide timers then thread wide timers. Perf involves checking freq events
then more per cpu details.
Checking these informations asynchronously every time we update the full
dynticks state bring avoidable overhead and a messy layout.
Let's introduce instead tick dependency masks: one for system wide
dependency (unstable sched clock, freq based perf events), one for CPU
wide dependency (sched, throttling perf events), and task/signal level
dependencies (posix cpu timers). The subsystems are responsible
for setting and clearing their dependency through a set of APIs that will
take care of concurrent dependency mask modifications and kick targets
to restart the relevant CPU tick whenever needed.
This new dependency engine stays beside the old one until all subsystems
having a tick dependency are converted to it.
Suggested-by: Thomas Gleixner <tglx@linutronix.de>
Suggested-by: Peter Zijlstra <peterz@infradead.org>
Reviewed-by: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Chris Metcalf <cmetcalf@ezchip.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Luiz Capitulino <lcapitulino@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Viresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
2016-03-02 16:41:39 +01:00
perf/bpf: Convert perf_event_array to use struct file
2016-01-29 08:35:25 +01:00
module: use a structure to encapsulate layout.
2015-12-04 22:46:25 +01:00
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-01-31 15:38:27 -08:00
gcov: use within_module() helper.
2015-12-04 22:46:25 +01:00
Merge branch 'irq-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-01-31 14:48:58 -08:00
livepatch: Cleanup module page permission changes
2015-12-04 22:51:07 +01:00
rtmutex: Make wait_lock irq safe
2016-01-26 11:08:35 +01:00
PM: APM_EMULATION does not depend on PM
2016-01-27 23:20:14 +01:00
kernel: printk: specify alignment for struct printk_log
2016-01-20 17:09:18 -08:00
Merge branches 'doc.2015.12.05a', 'exp.2015.12.07a', 'fixes.2015.12.07a', 'list.2015.12.04b' and 'torture.2015.12.05a' into HEAD
2015-12-07 17:02:54 -08:00
atomic: Export fetch_or()
2016-02-13 15:34:28 +01:00
nohz: New tick dependency mask
2016-03-02 16:41:39 +01:00
Merge branch 'perf-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-01-31 15:38:27 -08:00
certs: add .gitignore to stop git nagging about x509_certificate_list
2015-10-21 15:18:35 +01:00
async: export current_is_async()
2015-11-19 17:51:48 +01:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security
2016-01-17 19:13:15 -08:00
security: Make inode argument of inode_getsecid non-const
2015-12-24 11:09:39 -05:00
wrappers for ->i_mutex access
2016-01-22 18:04:28 -05:00
audit: audit_tree_match can be boolean
2015-11-04 08:23:51 -05:00
wrappers for ->i_mutex access
2016-01-22 18:04:28 -05:00
audit: fix comment block whitespace
2015-11-04 08:23:51 -05:00
security: Make inode argument of inode_getsecid non-const
2015-12-24 11:09:39 -05:00
Merge branch 'for-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/cgroup
2016-01-12 19:20:32 -08:00
cgroup: kill cgrp_ss_priv[CGROUP_CANFORK_COUNT] and friends
2015-12-03 10:24:08 -05:00
cgroup_pids: fix a typo.
2015-12-14 14:54:37 -05:00
context_tracking: Switch to new static_branch API
2015-11-24 09:56:43 +01:00
kernel/cpu.c: make set_cpu_* static inlines
2016-01-20 17:09:18 -08:00
kernel/cpu_pm: fix cpu_cluster_pm_exit comment
2015-09-03 02:42:20 +02:00
Merge branch 'for-4.4-fixes' into for-4.5
2015-12-03 10:22:52 -05:00
kmemcg: account certain kmem allocations to memcg
2016-01-14 16:00:49 -08:00
kmemcg: account certain kmem allocations to memcg
2016-01-14 16:00:49 -08:00
exit: remove unneeded declaration of exit_mm()
2016-01-20 17:09:18 -08:00
kernel/extable.c: remove duplicated include
2015-09-10 13:29:01 -07:00
mm: rework virtual memory accounting
2016-01-14 16:00:49 -08:00
rtmutex: Make wait_lock irq safe
2016-01-26 11:08:35 +01:00
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-01-20 17:09:18 -08:00
treewide: Remove old email address
2015-11-23 09:44:58 +01:00
treewide: Remove old email address
2015-11-23 09:44:58 +01:00
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-01-20 17:09:18 -08:00
kexec: set KEXEC_TYPE_CRASH before sanity_check_segment_list()
2016-01-20 17:09:18 -08:00
kernel/kexec_core.c: use list_for_each_entry_safe in kimage_free_page_list
2016-01-20 17:09:18 -08:00
kexec: move some memembers and definitions within the scope of CONFIG_KEXEC_FILE
2016-01-20 17:09:18 -08:00
kexec: move some memembers and definitions within the scope of CONFIG_KEXEC_FILE
2016-01-20 17:09:18 -08:00
kmod: don't run async usermode helper as a child of kworker thread
2015-10-23 17:55:10 +09:00
rcu: Remove TINY_RCU bloat from pointless boot parameters
2015-12-07 16:59:37 -08:00
kernel/kthread.c:kthread_create_on_node(): clarify documentation
2015-09-04 16:54:41 -07:00
sys_membarrier(): system-wide memory barrier (generic, x86)
2015-09-11 15:21:34 -07:00
sys_membarrier(): system-wide memory barrier (generic, x86)
2015-09-11 15:21:34 -07:00
mm, x86: get_user_pages() for dax mappings
2016-01-15 17:56:32 -08:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching
2016-01-14 16:38:02 -08:00
KEYS: Merge the type-specific data with the payload data
2015-10-21 15:18:36 +01:00
Merge branch 'x86-asm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2015-09-01 08:40:25 -07:00
printk: do cond_resched() between lines while outputting to consoles
2016-01-16 11:17:25 -08:00
Nothing exciting, minor tweaks and cleanups.
2015-11-09 15:53:39 -08:00
Merge branch 'sched-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
2016-01-31 15:44:04 -08:00
mm: rename alloc_pages_exact_node() to __alloc_pages_node()
2015-09-08 15:35:28 -07:00
ptrace: use fsuid, fsgid, effective creds for fs access checks
2016-01-20 17:09:18 -08:00
kexec: split kexec_load syscall from kexec core code
2015-09-10 13:29:01 -07:00
wrappers for ->i_mutex access
2016-01-22 18:04:28 -05:00
restrict /dev/mem to idle io memory ranges
2016-01-09 06:30:49 -08:00
seccomp: always propagate NO_NEW_PRIVS on tsync
2016-01-27 07:38:25 -08:00
kernel/signal.c: unexport sigsuspend()
2015-11-20 16:17:32 -08:00
mm, page_alloc: distinguish between being unable to sleep, unwilling to sleep and avoiding waking kswapd
2015-11-06 17:50:42 -08:00
stop_machine: Kill smp_hotplug_thread->pre_unpark, introduce stop_machine_unpark()
2015-10-20 10:23:55 +02:00
kernel/stop_machine.c: remove CONFIG_SMP dependencies
2016-01-16 11:17:24 -08:00
prctl: take mmap sem for writing to protect against others
2016-01-20 17:09:18 -08:00
vfs: add copy_file_range syscall and vfs helper
2015-12-01 14:00:53 -05:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
2016-01-22 10:24:03 -08:00
task_work: remove fifo ordering guarantee
2015-09-05 13:46:58 -07:00
torture: Consolidate cond_resched_rcu_qs() into stutter_wait()
2015-10-06 11:25:01 -07:00
tracepoint: Give priority to probes of tracepoints
2015-10-25 21:33:54 -04:00
kernel/*: switch to memdup_user_nul()
2016-01-04 10:27:55 -05:00
Merge branch 'for-4.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
2016-01-11 18:53:13 -08:00
workqueue: simplify the apply_workqueue_attrs_locked()
2016-01-07 11:04:34 -05:00
d027d45d8a