> > It's only small because it makes you rescan the free list.
> > So maybe you should do something else.
> > I looked at it a bit. Instead of scanning the free list, how about
> > scanning actual page structures? If page is unused, pass it to host.
> > Solves the problem of rescanning multiple tim
On 07/28/2016 02:51 PM, Michael S. Tsirkin wrote:
>> > If 1MB is too big, how about 512K, or 256K? 32K seems too small.
>> >
> It's only small because it makes you rescan the free list.
> So maybe you should do something else.
> I looked at it a bit. Instead of scanning the free list, how about
>
> > > On Wed, Jul 27, 2016 at 09:03:21AM -0700, Dave Hansen wrote:
> > > > On 07/26/2016 06:23 PM, Liang Li wrote:
> > > > > + vb->pfn_limit = VIRTIO_BALLOON_PFNS_LIMIT;
> > > > > + vb->pfn_limit = min(vb->pfn_limit, get_max_pfn());
> > > > > + vb->bmap_len = ALIGN(vb->pfn_limit, BITS_P
> On Thu, Jul 28, 2016 at 06:36:18AM +, Li, Liang Z wrote:
> > > > > This ends up doing a 1MB kmalloc() right? That seems a _bit_ big.
> > > > > How big was the pfn buffer before?
> > > >
> > > > Yes, it is if the max pfn is more than 32GB.
> > > > The size of the pfn buffer use before is 256*
On Thu, Jul 28, 2016 at 06:36:18AM +, Li, Liang Z wrote:
> > > > This ends up doing a 1MB kmalloc() right? That seems a _bit_ big.
> > > > How big was the pfn buffer before?
> > >
> > > Yes, it is if the max pfn is more than 32GB.
> > > The size of the pfn buffer use before is 256*4 = 1024 Byt
> > > This ends up doing a 1MB kmalloc() right? That seems a _bit_ big.
> > > How big was the pfn buffer before?
> >
> > Yes, it is if the max pfn is more than 32GB.
> > The size of the pfn buffer use before is 256*4 = 1024 Bytes, it's too
> > small, and it's the main reason for bad performance.
>
