/* * flush_tlb_mm() * * The code to switch to a new context is NOT valid for processes * which play with the space id's. Thus, we have to preserve the * space and just flush the entire tlb. However, the compilers, * dynamic linker, etc, do not manipulate space id's, so there * could be a significant performance benefit in switching contexts * and not flushing the whole tlb.
*/
staticinlinevoid flush_tlb_mm(struct mm_struct *mm)
{
BUG_ON(mm == &init_mm); /* Should never happen */
#if 1 || defined(CONFIG_SMP) /* Except for very small threads, flushing the whole TLB is * faster than using __flush_tlb_range. The pdtlb and pitlb * instructions are very slow because of the TLB broadcast. * It might be faster to do local range flushes on all CPUs * on PA 2.0 systems.
*/
flush_tlb_all(); #else /* FIXME: currently broken, causing space id and protection ids * to go out of sync, resulting in faults on userspace accesses. * This approach needs further investigation since running many * small applications (e.g., GCC testsuite) is faster on HP-UX.
*/ if (mm) { if (mm->context != 0)
free_sid(mm->context);
mm->context = alloc_sid(); if (mm == current->active_mm)
load_context(mm->context);
} #endif
}
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