Andrew Morton wrote:
Christoph Lameter <[email protected]> wrote:
This is a patchset intended to introduce page migration into the kernel
through a simple implementation of swap based page migration.
The aim is to be minimally intrusive in order to have some hopes for inclusion
into 2.6.15. A separate direct page migration patch is being developed that
applies on top of this patch. The direct migration patch is being discussed on
<[email protected]>.
I remain concerned that it hasn't been demonstrated that the infrastructure
which this patch provides will be adequate for all future applications -
especially memory hot-remove.
> So I'll queue this up for -mm, but I think we need to see an entire
> hot-remove implementation based on this, and have all the interested
> parties signed up to it before we can start moving the infrastructure into
> mainline.
>
It looks Christoph didn't use (direct)memory migration core in this set,
so memory-hotremove will not be affected by this.
At the first look, memory hotplugger will just replace swap_page()
with migrate_onepage().
Comparing swap-based migration and memory hotremove, memory hotremove
has to support wider kinds of pages other than anon, file-cache
swap-cache, mlocked() page used by direct I/O, HugeTLB pages and achieve
close to 100% guaranntee. Ignoring the fact migration and hotremove will
share the code, what they have to do is very different.
swap-based approach looks just intend to do process migration and
it itself looks not bad.
I think your point is that hotremove and migration will share some amounts of codes.
We are now discussing *direct* page migration and will share codes for anon pages.
It is being discussed in -lhms. We'd like to create good one.
Thanks,
-- KAMEZAWA Hiroyuki <[email protected]>
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