Christoph Lameter <[email protected]> wrote:
>
> Page migration is also useful for other purposes:
>
> 1. Memory hotplug. Migrating processes off a memory node that is going
> to be disconnected.
>
> 2. Remapping of bad pages. These could be detected through soft ECC errors
> and other mechanisms.
It's only useful for these things if it works with close-to-100% reliability.
And there are are all sorts of things which will prevent that - mlock,
ongoing direct-io, hugepages, whatever.
So before we can commit ourselves to the initial parts of this path we'd
need some reassurance that the overall scheme addresses these things and
that the end result has a high probability of supporting hot unplug and
remapping sufficiently well.
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