Re: [PATCH] mmu_notifier, kvm: Introduce dirty bit tracking in spte and mmu notifier to help KSM dirty bit tracking

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



On Wed, Jun 22, 2011 at 11:03 PM, Andrea Arcangeli <aarcange@xxxxxxxxxx> wrote:
> On Tue, Jun 21, 2011 at 09:32:39PM +0800, Nai Xia wrote:
>> diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
>> index d48ec60..b407a69 100644
>> --- a/arch/x86/kvm/vmx.c
>> +++ b/arch/x86/kvm/vmx.c
>> @@ -4674,6 +4674,7 @@ static int __init vmx_init(void)
>>               kvm_mmu_set_mask_ptes(0ull, 0ull, 0ull, 0ull,
>>                               VMX_EPT_EXECUTABLE_MASK);
>>               kvm_enable_tdp();
>> +             kvm_dirty_update = 0;
>>       } else
>>               kvm_disable_tdp();
>>
>
> Why not return !shadow_dirty_mask instead of adding a new var?
>
>>  struct mmu_notifier_ops {
>> +     int (*dirty_update)(struct mmu_notifier *mn,
>> +                          struct mm_struct *mm);
>> +
>
> Needs some docu.

OK. I'll add it.

>
> I think dirty_update isn't self explanatory name. I think
> "has_test_and_clear_dirty" would be better.

Agreed.  So it will be the name in the next version. :)

Thanks,
Nai

>
> If we don't flush the smp tlb don't we risk that we'll insert pages in
> the unstable tree that are volatile just because the dirty bit didn't
> get set again on the spte?
>
> The first patch I guess it's a sign of hugetlbfs going a little over
> the edge in trying to mix with the core VM... Passing that parameter
> &need_pte_unmap all over the place not so nice, maybe it'd be possible
> to fix within hugetlbfs to use a different method to walk the hugetlb
> vmas. I'd prefer that if possible.
>
> Thanks,
> Andrea
>

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href


[Index of Archives]     [Linux ARM Kernel]     [Linux ARM]     [Linux Omap]     [Fedora ARM]     [IETF Annouce]     [Bugtraq]     [Linux]     [Linux OMAP]     [Linux MIPS]     [ECOS]     [Asterisk Internet PBX]     [Linux API]