[Devel] [PATCH vz7] net/vhost: Replace kmalloc with kvmalloc for order>=3

[Andrei Vagin]

On Tue, Feb 27, 2018 at 11:27:31AM +0300, Andrey Ryabinin wrote:
> 
> 
> On 02/27/2018 01:27 AM, Andrei Vagin wrote:
> > On Mon, Feb 26, 2018 at 03:29:51PM +0300, Oleg Babin wrote:
> >> Currently we allocate more than eight pages of memory in
> >> vhost_net_set_ubuf_info() function and we do not need
> >> them to be physically contiguous, so it is feasible to
> >> replace a call to kmalloc() with a call to kvmalloc().
> > 
> > I see only 6 pages
> > 
> 
> Round up these 6 pages to the nearest power of two and you'l get 2^3 = 8 pages

It isn't "more than eight pages of memory"

> 
> > UIO_MAXIOV = 1024
> > 
> > struct ubuf_info {
> >         void (*callback)(struct ubuf_info *, bool zerocopy_success);
> >         void *ctx;
> >         unsigned long desc;
> > };
> > 
> > sizeof(struct ubuf_info) = 24
> > 
> > 1024 * 24 / 4096
> > 6
> > 
>