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13b35686e8
The existing wait queue support has support for custom wake up call backs, wake flags, wake key (passed to call back) and exclusive flags that allow wakers to be tagged as exclusive, for limiting the number of wakers. In a lot of cases, none of these features are used, and hence we can benefit from a slimmed down version that lowers memory overhead and reduces runtime overhead. The concept originated from -rt, where waitqueues are a constant source of trouble, as we can't convert the head lock to a raw spinlock due to fancy and long lasting callbacks. With the removal of custom callbacks, we can use a raw lock for queue list manipulations, hence allowing the simple wait support to be used in -rt. [Patch is from PeterZ which is based on Thomas version. Commit message is written by Paul G. Daniel: - Fixed some compile issues - Added non-lazy implementation of swake_up_locked as suggested by Boqun Feng.] Originally-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Daniel Wagner <daniel.wagner@bmw-carit.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: linux-rt-users@vger.kernel.org Cc: Boqun Feng <boqun.feng@gmail.com> Cc: Marcelo Tosatti <mtosatti@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Paul E. McKenney" <paulmck@linux.vnet.ibm.com> Link: http://lkml.kernel.org/r/1455871601-27484-2-git-send-email-wagi@monom.org Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
22 lines
931 B
Makefile
22 lines
931 B
Makefile
ifdef CONFIG_FUNCTION_TRACER
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CFLAGS_REMOVE_clock.o = $(CC_FLAGS_FTRACE)
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endif
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ifneq ($(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_core.o := $(PROFILING) -fno-omit-frame-pointer
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endif
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obj-y += core.o loadavg.o clock.o cputime.o
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obj-y += idle_task.o fair.o rt.o deadline.o stop_task.o
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obj-y += wait.o swait.o completion.o idle.o
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obj-$(CONFIG_SMP) += cpupri.o cpudeadline.o
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obj-$(CONFIG_SCHED_AUTOGROUP) += auto_group.o
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obj-$(CONFIG_SCHEDSTATS) += stats.o
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obj-$(CONFIG_SCHED_DEBUG) += debug.o
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obj-$(CONFIG_CGROUP_CPUACCT) += cpuacct.o
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