Re: Transparent huge pages and shmem?

[Hugh Dickins]

On Mon, 23 Jan 2012, Borzenkov, Andrey wrote:

> In case of THP enabled kernel - will THP be used for SysV shmem?
> The obvious target is to avoid pre-allocation of huge pages pool
> for databases like Oracle that is required today.

It will one day, yes.  Various people are very interested in THP on
tmpfs/shmem, which serves SysV shm.  But at present THP is limited to
private anonymous pages, and its extension to shared file pages is not
trivial.  I have not heard of anyone making significant progress on
that as yet - but perhaps someone is working on it behind the scenes.

Hugh
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