Messages in this thread | | | Date | Tue, 19 Feb 2002 09:29:04 -0800 (PST) | From | Linus Torvalds <> | Subject | Re: [RFC] Page table sharing |
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On Tue, 19 Feb 2002, Daniel Phillips wrote: > > > > At that point you might as well make the TLB shootdown global (ie you keep > > track of a mask of CPU's whose TLB's you want to kill, and any pmd that > > has count > 1 just makes that mask be "all CPU's"). > > How do we know when to do the global tlb flush?
See above.
Basically, the algorithm is:
invalidate_cpu_mask = 0;
.. for each page swapped out ..
pte = ptep_get_and_clear(ptep); save_pte_and_mm(pte_page(pte)); mask = mm->cpu_vm_mask; if (page_count(pmd_page) > 1) mask = ~0UL; invalidate_cpu_mask |= mask;
and then at the end you just do
flush_tlb_cpus(invalidate_cpu_mask); for_each_page_saved() { free_page(page); }
(yeah, yeah, add cache coherency etc).
Linus
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