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
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
This archive was generated by hypermail 2b29 : Sat Feb 23 2002 - 21:00:20 EST