Re: [PATCH 0/5] Swap Migration V5: Overview

[Hirokazu Takahashi <taka@valinux.co.jp>]

Hi,

> > > 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.
> > >
> > > Do you think the features which these patches add should be Kconfigurable?

This code looks no help for hot-remove. It seems able to handle only
pages easily to migrate, while hot-remove has to guarantee all pages
can be migrated.

> > Yes please.  At least something under CONFIG_EMBEDDED to save poor Matt the 
> > trouble of chopping it out himself. :)
> 
> Ok. We will think of something to switch this off.

Hi Christoph, sorry I've been off from lhms for long time.

Shall I port the generic memory migration code for hot-remove to -mm tree
directly, and add some new interface like migrate_page_to(struct page *from,
struct page *to) so this may probably fit for your purpose.

The code is still in Dave's mhp1 tree waiting for being merged to -mm tree.
The port will be easy because the migration code is independent to the
memory hotplug code. The core code isn't so big.


Thanks,
Hirokazu Takahashi.
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