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Create a kernel/rcutree_plugin.h file that contains definitions for preemptable RCU (or, under the #else branch of the #ifdef, empty definitions for the classic non-preemptable semantics). These definitions fit into plugins defined in kernel/rcutree.c for this purpose. This variant of preemptable RCU uses a new algorithm whose read-side expense is roughly that of classic hierarchical RCU under CONFIG_PREEMPT. This new algorithm's update-side expense is similar to that of classic hierarchical RCU, and, in absence of read-side preemption or blocking, is exactly that of classic hierarchical RCU. Perhaps more important, this new algorithm has a much simpler implementation, saving well over 1,000 lines of code compared to mainline's implementation of preemptable RCU, which will hopefully be retired in favor of this new algorithm. The simplifications are obtained by maintaining per-task nesting state for running tasks, and using a simple lock-protected algorithm to handle accounting when tasks block within RCU read-side critical sections, making use of lessons learned while creating numerous user-level RCU implementations over the past 18 months. Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Cc: laijs@cn.fujitsu.com Cc: dipankar@in.ibm.com Cc: akpm@linux-foundation.org Cc: mathieu.desnoyers@polymtl.ca Cc: josht@linux.vnet.ibm.com Cc: dvhltc@us.ibm.com Cc: niv@us.ibm.com Cc: peterz@infradead.org Cc: rostedt@goodmis.org LKML-Reference: <12509746134003-git-send-email-> Signed-off-by: Ingo Molnar <mingo@elte.hu>
134 lines
4.9 KiB
Makefile
134 lines
4.9 KiB
Makefile
#
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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 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
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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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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_USE_GENERIC_SMP_HELPERS) += 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-$(CONFIG_CGROUP_DEBUG) += cgroup_debug.o
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obj-$(CONFIG_CGROUP_FREEZER) += cgroup_freezer.o
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obj-$(CONFIG_CPUSETS) += cpuset.o
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obj-$(CONFIG_CGROUP_NS) += ns_cgroup.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_STOP_MACHINE) += 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 audit_watch.o
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obj-$(CONFIG_AUDITSYSCALL) += auditsc.o
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obj-$(CONFIG_GCOV_KERNEL) += gcov/
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obj-$(CONFIG_AUDIT_TREE) += audit_tree.o
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obj-$(CONFIG_KPROBES) += kprobes.o
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obj-$(CONFIG_KGDB) += kgdb.o
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obj-$(CONFIG_DETECT_SOFTLOCKUP) += softlockup.o
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obj-$(CONFIG_DETECT_HUNG_TASK) += hung_task.o
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obj-$(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-$(CONFIG_PREEMPT_RCU) += rcupreempt.o
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obj-$(CONFIG_TREE_RCU_TRACE) += rcutree_trace.o
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obj-$(CONFIG_PREEMPT_RCU_TRACE) += rcupreempt_trace.o
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obj-$(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_MARKERS) += marker.o
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obj-$(CONFIG_TRACEPOINTS) += tracepoint.o
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obj-$(CONFIG_LATENCYTOP) += latencytop.o
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obj-$(CONFIG_HAVE_GENERIC_DMA_COHERENT) += dma-coherent.o
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obj-$(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_SMP) += sched_cpupri.o
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obj-$(CONFIG_SLOW_WORK) += slow-work.o
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obj-$(CONFIG_PERF_COUNTERS) += perf_counter.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: .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[] = 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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