On Thu, Apr 24, 2014 at 02:57:40PM -0400, Matthew Wilcox wrote:
> By calling the device driver to write the page directly, we avoid
> allocating a BIO, which allows us to free memory without allocating
> memory.

I got handed some performance numbers last night!  Next time you're updating
the patch description, please use:

By calling the device driver to write the page directly, we avoid
allocating a BIO, which allows us to free memory without allocating
memory.  When running a swap-heavy benchmark, system time is reduced by
about 20%.

Tested-by: Dheeraj Reddy <dheeraj.reddy@intel.com>
Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>