Re: [PATCH V5 12/12] net: netvsc: Add Isolation VM support for netvsc driver

[Tianyu Lan]

On 9/16/2021 12:46 AM, Haiyang Zhang wrote:
> > > +				memset(vmap_pages, 0,
> > > +				       sizeof(*vmap_pages) * vmap_page_index);
> > > +				vmap_page_index = 0;
> > > +
> > > +				for (j = 0; j < i; j++)
> > > +					__free_pages(pages[j], alloc_unit);
> > > +
> > > +				kfree(pages);
> > > +				alloc_unit = 1;
> > This is the case where a large enough contiguous physical memory chunk
> > could not be found.  But rather than dropping all the way down to single
> > pages, would it make sense to try something smaller, but not 1?  For
> > example, cut the alloc_unit in half and try again.  But I'm not sure of
> > all the implications.
> I had the same question. But probably gradually decrementing uses too much
> time?

This version is to propose the solution. We may optimize this to try
smaller size until to single page if this is right direction.