Re: [PATCH 0/4] Swapping

[Anthony Liguori <anthony-rdkfGonbjUSkNkDKm+mE6A@public.gmane.org>]

Izik Eidus wrote:
> Anthony Liguori wrote:
>> I've been playing around with these patches.  If I do an 
>> madvise(MADV_DONTNEED) in userspace, when I close the VM, I get the 
>> following bug.  My knowledge of the mm is limited but since 
>> madvise(MADV_DONTNEED) effectively does a zap_page_range() I wonder 
>> if we're lacking the necessary callback to also remove any potential 
>> GPA covered by that range from shadow page cache.
>>
>> Regards,
>>
>> Anthony Liguori
> it probably beacuse the changes of the first patch, ( that make all 
> present shadow pages rmapped )
> Anthony can you please check what happn if you run latest kvm with the 
> patch (of the rmap) and without the patch?

It looks like it's my patch for doing an in kernel mmap() to support 
older userspaces.  I'll figure out what the problem is.

But at any rate, would madvise() be able to evict the current contents 
of something in the shadow page cache or will the guest not pick up the 
new memory until the old gets evicted from the shadow page cache?

Regards,

Anthony Liguori


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