Re: Best way to pin a page in ext4?

On Tue, 16 Sep 2014, Hugh Dickins wrote:

On the page migration issue: it's not quite as straightforward as
Christoph suggests.  He and I agree completely that mlocked pages
should be migratable, but some real-time-minded people disagree:
so normal compaction is still forbidden to migrate mlocked pages in
the vanilla kernel (though we in Google patch that prohibition out).
So pinning by refcount is no worse for compaction than mlocking,
in the vanilla kernel.

Note though that compaction is not the only mechanism that uses page
migration.

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