![Mel Gorman](/assets/img/avatar_default.png)
Bisection between 3.11 and 3.12 fingered commit 9824cf97
("mm:
vmstats: tlb flush counters") to cause overhead problems.
The counters are undeniably useful but how often do we really
need to debug TLB flush related issues? It does not justify
taking the penalty everywhere so make it a debugging option.
Signed-off-by: Mel Gorman <mgorman@suse.de>
Tested-by: Davidlohr Bueso <davidlohr@hp.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Alex Shi <alex.shi@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-XzxjntugxuwpxXhcrxqqh53b@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
207 lines
4.8 KiB
C
207 lines
4.8 KiB
C
#ifndef _ASM_X86_TLBFLUSH_H
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#define _ASM_X86_TLBFLUSH_H
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#include <linux/mm.h>
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#include <linux/sched.h>
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#include <asm/processor.h>
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#include <asm/special_insns.h>
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#ifdef CONFIG_PARAVIRT
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#include <asm/paravirt.h>
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#else
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#define __flush_tlb() __native_flush_tlb()
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#define __flush_tlb_global() __native_flush_tlb_global()
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#define __flush_tlb_single(addr) __native_flush_tlb_single(addr)
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#endif
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static inline void __native_flush_tlb(void)
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{
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native_write_cr3(native_read_cr3());
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}
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static inline void __native_flush_tlb_global_irq_disabled(void)
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{
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unsigned long cr4;
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cr4 = native_read_cr4();
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/* clear PGE */
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native_write_cr4(cr4 & ~X86_CR4_PGE);
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/* write old PGE again and flush TLBs */
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native_write_cr4(cr4);
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}
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static inline void __native_flush_tlb_global(void)
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{
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unsigned long flags;
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/*
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* Read-modify-write to CR4 - protect it from preemption and
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* from interrupts. (Use the raw variant because this code can
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* be called from deep inside debugging code.)
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*/
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raw_local_irq_save(flags);
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__native_flush_tlb_global_irq_disabled();
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raw_local_irq_restore(flags);
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}
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static inline void __native_flush_tlb_single(unsigned long addr)
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{
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asm volatile("invlpg (%0)" ::"r" (addr) : "memory");
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}
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static inline void __flush_tlb_all(void)
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{
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if (cpu_has_pge)
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__flush_tlb_global();
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else
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__flush_tlb();
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}
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static inline void __flush_tlb_one(unsigned long addr)
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{
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count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ONE);
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__flush_tlb_single(addr);
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}
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#define TLB_FLUSH_ALL -1UL
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/*
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* TLB flushing:
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*
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* - flush_tlb() flushes the current mm struct TLBs
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* - flush_tlb_all() flushes all processes TLBs
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* - flush_tlb_mm(mm) flushes the specified mm context TLB's
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* - flush_tlb_page(vma, vmaddr) flushes one page
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* - flush_tlb_range(vma, start, end) flushes a range of pages
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* - flush_tlb_kernel_range(start, end) flushes a range of kernel pages
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* - flush_tlb_others(cpumask, mm, start, end) flushes TLBs on other cpus
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*
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* ..but the i386 has somewhat limited tlb flushing capabilities,
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* and page-granular flushes are available only on i486 and up.
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*/
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#ifndef CONFIG_SMP
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/* "_up" is for UniProcessor.
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*
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* This is a helper for other header functions. *Not* intended to be called
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* directly. All global TLB flushes need to either call this, or to bump the
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* vm statistics themselves.
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*/
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static inline void __flush_tlb_up(void)
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{
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count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
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__flush_tlb();
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}
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static inline void flush_tlb_all(void)
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{
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count_vm_tlb_event(NR_TLB_LOCAL_FLUSH_ALL);
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__flush_tlb_all();
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}
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static inline void flush_tlb(void)
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{
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__flush_tlb_up();
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}
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static inline void local_flush_tlb(void)
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{
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__flush_tlb_up();
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}
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static inline void flush_tlb_mm(struct mm_struct *mm)
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{
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if (mm == current->active_mm)
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__flush_tlb_up();
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}
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static inline void flush_tlb_page(struct vm_area_struct *vma,
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unsigned long addr)
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{
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if (vma->vm_mm == current->active_mm)
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__flush_tlb_one(addr);
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}
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static inline void flush_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end)
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{
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if (vma->vm_mm == current->active_mm)
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__flush_tlb_up();
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}
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static inline void flush_tlb_mm_range(struct mm_struct *mm,
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unsigned long start, unsigned long end, unsigned long vmflag)
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{
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if (mm == current->active_mm)
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__flush_tlb_up();
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}
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static inline void native_flush_tlb_others(const struct cpumask *cpumask,
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struct mm_struct *mm,
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unsigned long start,
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unsigned long end)
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{
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}
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static inline void reset_lazy_tlbstate(void)
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{
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}
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static inline void flush_tlb_kernel_range(unsigned long start,
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unsigned long end)
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{
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flush_tlb_all();
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}
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#else /* SMP */
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#include <asm/smp.h>
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#define local_flush_tlb() __flush_tlb()
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#define flush_tlb_mm(mm) flush_tlb_mm_range(mm, 0UL, TLB_FLUSH_ALL, 0UL)
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#define flush_tlb_range(vma, start, end) \
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flush_tlb_mm_range(vma->vm_mm, start, end, vma->vm_flags)
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extern void flush_tlb_all(void);
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extern void flush_tlb_current_task(void);
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extern void flush_tlb_page(struct vm_area_struct *, unsigned long);
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extern void flush_tlb_mm_range(struct mm_struct *mm, unsigned long start,
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unsigned long end, unsigned long vmflag);
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extern void flush_tlb_kernel_range(unsigned long start, unsigned long end);
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#define flush_tlb() flush_tlb_current_task()
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void native_flush_tlb_others(const struct cpumask *cpumask,
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struct mm_struct *mm,
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unsigned long start, unsigned long end);
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#define TLBSTATE_OK 1
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#define TLBSTATE_LAZY 2
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struct tlb_state {
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struct mm_struct *active_mm;
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int state;
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};
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DECLARE_PER_CPU_SHARED_ALIGNED(struct tlb_state, cpu_tlbstate);
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static inline void reset_lazy_tlbstate(void)
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{
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this_cpu_write(cpu_tlbstate.state, 0);
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this_cpu_write(cpu_tlbstate.active_mm, &init_mm);
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}
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#endif /* SMP */
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#ifndef CONFIG_PARAVIRT
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#define flush_tlb_others(mask, mm, start, end) \
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native_flush_tlb_others(mask, mm, start, end)
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#endif
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#endif /* _ASM_X86_TLBFLUSH_H */
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