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MIPS: smp: optimization for flush_tlb_mm when exiting
When process exits or execute new binary, it will call function exit_mmap with old mm, there is such function call trace: exit_mmap(struct mm_struct *mm) --> tlb_finish_mmu(&tlb, 0, -1) --> arch_tlb_finish_mmu(tlb, start, end, force) --> tlb_flush_mmu(tlb); --> tlb_flush(struct mmu_gather *tlb) --> flush_tlb_mm(tlb->mm) It is not necessary to flush tlb since oldmm is not used anymore by the process, there is similar operations on IA64/ARM64 etc, this patch adds such optimization on MIPS. Signed-off-by: Mao Bibo <maobibo@loongson.cn> Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
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@ -518,6 +518,12 @@ static inline void smp_on_each_tlb(void (*func) (void *info), void *info)
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void flush_tlb_mm(struct mm_struct *mm)
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{
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if (!mm)
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return;
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if (atomic_read(&mm->mm_users) == 0)
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return; /* happens as a result of exit_mmap() */
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preempt_disable();
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if (cpu_has_mmid) {
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