d1ba638aee
task_get_effective_timer_slack() returns timer slack value to be used to configure per-task timers. It can be equal or higher than task's timer slack value. For now task_get_effective_timer_slack() returns timer_slack_ns of the task. Timer slack cgroup controller will implement a bit more sophisticated logic. Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name> From: "Kirill A. Shutemov" <kirill@shutemov.name> PR_GET_EFFECTIVE_TIMERSLACK allows process to know its effective timer slack value. Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name> From: "Kirill A. Shutemov" <kirill@shutemov.name> Every task_struct has timer_slack_ns value. This value uses to round up poll() and select() timeout values. This feature can be useful in mobile environment where combined wakeups are desired. Originally, prctl() was the only way to change timer slack value of a process. So you was not able change timer slack value of another process. cgroup subsys "timer_slack" implements timer slack controller. It provides a way to set minimal timer slack value for a group of tasks. If a task belongs to a cgroup with minimal timer slack value higher than task's value, cgroup's value will be applied. Timer slack controller allows to implement setting timer slack value of a process based on a policy. For example, you can create foreground and background cgroups and move tasks between them based on system state. Idea-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name> From: "Kirill A. Shutemov" <kirill@shutemov.name> Changelog: v10 [7 month later, thanks to A Plumber's Wish List]: - rebased to linux-next-20111011 v9: - update documentation - minor cleanup v8: - change hiearchy rules - introduce timer_slack.effective_slack_ns - get_task_timer_slack() -> task_get_effective_timer_slack() - task_get_effective_timer_slack() splited in separate patch - implement PR_GET_EFFECTIVE_TIMERSLACK v7: - totally reworked interface and rewritten from scratch (See Documentation/cgroups/timer_slack.txt for more information) v6: - add documentation - use notifier_call_chain() instead of check hook - fix validate_change() - cleanup v5: - -EBUSY on writing to timer_slack.min_slack_ns/max_slack_ns if a child has wider min-max range v4: - hierarchy support - drop dummy_timer_slack_check() - workaround lockdep false (?) positive - allow 0 as timer slack value v3: - rework interface - s/EXPORT_SYMBOL/EXPORT_SYMBOL_GPL/ v2: - fixed with CONFIG_CGROUP_TIMER_SLACK=y v1: - initial revision Kirill A. Shutemov (3): hrtimer: introduce effective timer slack hrtimer: implement PR_GET_EFFECTIVE_TIMERSLACK cgroups: introduce timer slack controller Documentation/cgroups/timer_slack.txt | 72 +++++++++++++++++++ fs/select.c | 7 +-- include/linux/cgroup_subsys.h | 7 ++ include/linux/prctl.h | 6 ++ include/linux/sched.h | 10 +++ init/Kconfig | 8 ++ kernel/Makefile | 1 + kernel/cgroup_timer_slack.c | 124 +++++++++++++++++++++++++++++++++ kernel/fork.c | 4 + kernel/futex.c | 4 +- kernel/hrtimer.c | 2 +- kernel/sys.c | 3 + 12 files changed, 240 insertions(+), 8 deletions(-) create mode 100644 Documentation/cgroups/timer_slack.txt create mode 100644 kernel/cgroup_timer_slack.c Conflicts: include/linux/cgroup_subsys.h
142 lines
5.1 KiB
Makefile
Executable file
142 lines
5.1 KiB
Makefile
Executable file
#
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# Makefile for the linux kernel.
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#
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obj-y = sched.o fork.o exec_domain.o panic.o printk.o \
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cpu.o exit.o itimer.o time.o softirq.o resource.o \
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sysctl.o sysctl_binary.o capability.o ptrace.o timer.o user.o \
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signal.o sys.o kmod.o workqueue.o pid.o \
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rcupdate.o extable.o params.o posix-timers.o \
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kthread.o wait.o kfifo.o sys_ni.o posix-cpu-timers.o mutex.o \
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hrtimer.o rwsem.o nsproxy.o srcu.o semaphore.o \
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notifier.o ksysfs.o pm_qos_params.o sched_clock.o cred.o \
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async.o range.o jump_label.o
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obj-y += groups.o
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ifdef CONFIG_FUNCTION_TRACER
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# Do not trace debug files and internal ftrace files
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CFLAGS_REMOVE_lockdep.o = -pg
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CFLAGS_REMOVE_lockdep_proc.o = -pg
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CFLAGS_REMOVE_mutex-debug.o = -pg
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CFLAGS_REMOVE_rtmutex-debug.o = -pg
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CFLAGS_REMOVE_cgroup-debug.o = -pg
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CFLAGS_REMOVE_sched_clock.o = -pg
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CFLAGS_REMOVE_irq_work.o = -pg
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endif
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obj-$(CONFIG_FREEZER) += freezer.o
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obj-$(CONFIG_PROFILING) += profile.o
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obj-$(CONFIG_SYSCTL_SYSCALL_CHECK) += sysctl_check.o
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obj-$(CONFIG_STACKTRACE) += stacktrace.o
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obj-y += time/
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obj-$(CONFIG_DEBUG_MUTEXES) += mutex-debug.o
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obj-$(CONFIG_LOCKDEP) += lockdep.o
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ifeq ($(CONFIG_PROC_FS),y)
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obj-$(CONFIG_LOCKDEP) += lockdep_proc.o
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endif
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obj-$(CONFIG_FUTEX) += futex.o
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ifeq ($(CONFIG_COMPAT),y)
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obj-$(CONFIG_FUTEX) += futex_compat.o
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endif
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obj-$(CONFIG_RT_MUTEXES) += rtmutex.o
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obj-$(CONFIG_DEBUG_RT_MUTEXES) += rtmutex-debug.o
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obj-$(CONFIG_RT_MUTEX_TESTER) += rtmutex-tester.o
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obj-$(CONFIG_GENERIC_ISA_DMA) += dma.o
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obj-$(CONFIG_SMP) += smp.o
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ifneq ($(CONFIG_SMP),y)
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obj-y += up.o
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endif
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obj-$(CONFIG_SMP) += spinlock.o
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obj-$(CONFIG_DEBUG_SPINLOCK) += spinlock.o
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obj-$(CONFIG_PROVE_LOCKING) += spinlock.o
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obj-$(CONFIG_UID16) += uid16.o
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obj-$(CONFIG_MODULES) += module.o
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obj-$(CONFIG_KALLSYMS) += kallsyms.o
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obj-$(CONFIG_PM) += power/
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obj-$(CONFIG_FREEZER) += power/
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obj-$(CONFIG_BSD_PROCESS_ACCT) += acct.o
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obj-$(CONFIG_KEXEC) += kexec.o
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obj-$(CONFIG_BACKTRACE_SELF_TEST) += backtracetest.o
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obj-$(CONFIG_COMPAT) += compat.o
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obj-$(CONFIG_CGROUPS) += cgroup.o
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obj-$(CONFIG_CGROUP_FREEZER) += cgroup_freezer.o
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obj-$(CONFIG_CGROUP_TIMER_SLACK) += cgroup_timer_slack.o
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obj-$(CONFIG_CPUSETS) += cpuset.o
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obj-$(CONFIG_UTS_NS) += utsname.o
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obj-$(CONFIG_USER_NS) += user_namespace.o
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obj-$(CONFIG_PID_NS) += pid_namespace.o
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obj-$(CONFIG_IKCONFIG) += configs.o
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obj-$(CONFIG_RESOURCE_COUNTERS) += res_counter.o
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obj-$(CONFIG_SMP) += stop_machine.o
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obj-$(CONFIG_KPROBES_SANITY_TEST) += test_kprobes.o
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obj-$(CONFIG_AUDIT) += audit.o auditfilter.o
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obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
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obj-$(CONFIG_AUDIT_WATCH) += audit_watch.o
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obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
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obj-$(CONFIG_GCOV_KERNEL) += gcov/
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_KGDB) += debug/
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obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
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obj-$(CONFIG_LOCKUP_DETECTOR) += watchdog.o
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obj-$(CONFIG_GENERIC_HARDIRQS) += irq/
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obj-$(CONFIG_SECCOMP) += seccomp.o
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obj-$(CONFIG_RCU_TORTURE_TEST) += rcutorture.o
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obj-$(CONFIG_TREE_RCU) += rcutree.o
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obj-$(CONFIG_TREE_PREEMPT_RCU) += rcutree.o
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obj-$(CONFIG_TREE_RCU_TRACE) += rcutree_trace.o
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obj-$(CONFIG_JRCU) += jrcu.o
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obj-$(CONFIG_TINY_RCU) += rcutiny.o
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obj-$(CONFIG_TINY_PREEMPT_RCU) += rcutiny.o
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obj-$(CONFIG_RELAY) += relay.o
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obj-$(CONFIG_SYSCTL) += utsname_sysctl.o
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obj-$(CONFIG_TASK_DELAY_ACCT) += delayacct.o
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obj-$(CONFIG_TASKSTATS) += taskstats.o tsacct.o
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obj-$(CONFIG_TRACEPOINTS) += tracepoint.o
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obj-$(CONFIG_LATENCYTOP) += latencytop.o
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obj-$(CONFIG_BINFMT_ELF) += elfcore.o
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obj-$(CONFIG_COMPAT_BINFMT_ELF) += elfcore.o
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obj-$(CONFIG_BINFMT_ELF_FDPIC) += elfcore.o
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obj-$(CONFIG_FUNCTION_TRACER) += trace/
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obj-$(CONFIG_TRACING) += trace/
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obj-$(CONFIG_X86_DS) += trace/
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obj-$(CONFIG_RING_BUFFER) += trace/
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obj-$(CONFIG_TRACEPOINTS) += trace/
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obj-$(CONFIG_SMP) += sched_cpupri.o
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obj-$(CONFIG_IRQ_WORK) += irq_work.o
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obj-$(CONFIG_PERF_EVENTS) += events/
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obj-$(CONFIG_USER_RETURN_NOTIFIER) += user-return-notifier.o
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obj-$(CONFIG_PADATA) += padata.o
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obj-$(CONFIG_CRASH_DUMP) += crash_dump.o
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ifneq ($(CONFIG_SCHED_OMIT_FRAME_POINTER),y)
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# According to Alan Modra <alan@linuxcare.com.au>, the -fno-omit-frame-pointer is
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# needed for x86 only. Why this used to be enabled for all architectures is beyond
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# me. I suspect most platforms don't need this, but until we know that for sure
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# I turn this off for IA-64 only. Andreas Schwab says it's also needed on m68k
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# to get a correct value for the wait-channel (WCHAN in ps). --davidm
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CFLAGS_sched.o := $(PROFILING) -fno-omit-frame-pointer
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endif
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$(obj)/configs.o: $(obj)/config_data.h
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# config_data.h contains the same information as ikconfig.h but gzipped.
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# Info from config_data can be extracted from /proc/config*
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targets += config_data.gz
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$(obj)/config_data.gz: $(KCONFIG_CONFIG) FORCE
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$(call if_changed,gzip)
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quiet_cmd_ikconfiggz = IKCFG $@
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cmd_ikconfiggz = (echo "static const char kernel_config_data[] __used = MAGIC_START"; cat $< | scripts/bin2c; echo "MAGIC_END;") > $@
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targets += config_data.h
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$(obj)/config_data.h: $(obj)/config_data.gz FORCE
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$(call if_changed,ikconfiggz)
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$(obj)/time.o: $(obj)/timeconst.h
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quiet_cmd_timeconst = TIMEC $@
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cmd_timeconst = $(PERL) $< $(CONFIG_HZ) > $@
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targets += timeconst.h
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$(obj)/timeconst.h: $(src)/timeconst.pl FORCE
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$(call if_changed,timeconst)
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