75f93fed50
Yuanhan reported a serious throughput regression in his pigz benchmark. Using the ftrace patch I found that several idle paths need more TLC before we can switch the generic need_resched() over to preempt_need_resched. The preemption paths benefit most from preempt_need_resched and do indeed use it; all other need_resched() users don't really care that much so reverting need_resched() back to tif_need_resched() is the simple and safe solution. Reported-by: Yuanhan Liu <yuanhan.liu@linux.intel.com> Signed-off-by: Peter Zijlstra <peterz@infradead.org> Cc: Fengguang Wu <fengguang.wu@intel.com> Cc: Huang Ying <ying.huang@intel.com> Cc: lkp@linux.intel.com Cc: Linus Torvalds <torvalds@linux-foundation.org> Link: http://lkml.kernel.org/r/20130927153003.GF15690@laptop.programming.kicks-ass.net Signed-off-by: Ingo Molnar <mingo@kernel.org>
106 lines
2.6 KiB
C
106 lines
2.6 KiB
C
#ifndef __ASM_PREEMPT_H
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#define __ASM_PREEMPT_H
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#include <linux/thread_info.h>
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/*
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* We mask the PREEMPT_NEED_RESCHED bit so as not to confuse all current users
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* that think a non-zero value indicates we cannot preempt.
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*/
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static __always_inline int preempt_count(void)
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{
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return current_thread_info()->preempt_count & ~PREEMPT_NEED_RESCHED;
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}
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static __always_inline int *preempt_count_ptr(void)
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{
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return ¤t_thread_info()->preempt_count;
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}
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/*
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* We now loose PREEMPT_NEED_RESCHED and cause an extra reschedule; however the
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* alternative is loosing a reschedule. Better schedule too often -- also this
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* should be a very rare operation.
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*/
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static __always_inline void preempt_count_set(int pc)
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{
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*preempt_count_ptr() = pc;
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}
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/*
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* must be macros to avoid header recursion hell
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*/
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#define task_preempt_count(p) \
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(task_thread_info(p)->preempt_count & ~PREEMPT_NEED_RESCHED)
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#define init_task_preempt_count(p) do { \
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task_thread_info(p)->preempt_count = PREEMPT_DISABLED; \
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} while (0)
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#define init_idle_preempt_count(p, cpu) do { \
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task_thread_info(p)->preempt_count = PREEMPT_ENABLED; \
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} while (0)
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/*
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* We fold the NEED_RESCHED bit into the preempt count such that
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* preempt_enable() can decrement and test for needing to reschedule with a
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* single instruction.
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*
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* We invert the actual bit, so that when the decrement hits 0 we know we both
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* need to resched (the bit is cleared) and can resched (no preempt count).
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*/
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static __always_inline void set_preempt_need_resched(void)
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{
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*preempt_count_ptr() &= ~PREEMPT_NEED_RESCHED;
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}
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static __always_inline void clear_preempt_need_resched(void)
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{
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*preempt_count_ptr() |= PREEMPT_NEED_RESCHED;
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}
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static __always_inline bool test_preempt_need_resched(void)
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{
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return !(*preempt_count_ptr() & PREEMPT_NEED_RESCHED);
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}
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/*
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* The various preempt_count add/sub methods
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*/
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static __always_inline void __preempt_count_add(int val)
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{
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*preempt_count_ptr() += val;
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}
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static __always_inline void __preempt_count_sub(int val)
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{
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*preempt_count_ptr() -= val;
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}
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static __always_inline bool __preempt_count_dec_and_test(void)
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{
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return !--*preempt_count_ptr();
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}
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/*
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* Returns true when we need to resched and can (barring IRQ state).
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*/
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static __always_inline bool should_resched(void)
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{
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return unlikely(!*preempt_count_ptr());
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}
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#ifdef CONFIG_PREEMPT
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extern asmlinkage void preempt_schedule(void);
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#define __preempt_schedule() preempt_schedule()
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#ifdef CONFIG_CONTEXT_TRACKING
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extern asmlinkage void preempt_schedule_context(void);
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#define __preempt_schedule_context() preempt_schedule_context()
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#endif
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#endif /* CONFIG_PREEMPT */
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#endif /* __ASM_PREEMPT_H */
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