On 6/14/19 10:38 PM, Jeff Moyer wrote:
"Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxx> writes:
On 6/14/19 10:06 PM, Dan Williams wrote:
On Fri, Jun 14, 2019 at 9:26 AM Aneesh Kumar K.V
<aneesh.kumar@xxxxxxxxxxxxx> wrote:
Why not let the arch
arch decide the SUBSECTION_SHIFT and default to one subsection per
section if arch is not enabled to work with subsection.
Because that keeps the implementation from ever reaching a point where
a namespace might be able to be moved from one arch to another. If we
can squash these arch differences then we can have a common tool to
initialize namespaces outside of the kernel. The one wrinkle is
device-dax that wants to enforce the mapping size,
The fsdax have a much bigger issue right? The file system block size
is the same as PAGE_SIZE and we can't make it portable across archs
that support different PAGE_SIZE?
File system blocks are not tied to page size. They can't be *bigger*
than the page size currently, but they can be smaller.
ppc64 page size is 64K.
Still, I don't see that as an arugment against trying to make the
namespaces work across architectures. Consider a user who only has
sector mode namespaces. We'd like that to work if at all possible.
agreed. I was trying to list out the challenges here.
-aneesh
