linux-kernel - Re: Transparent huge pages and shmem?

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Message-ID: <alpine.LSU.2.00.1201231132030.1677@eggly.anvils>
Date:	Mon, 23 Jan 2012 11:38:08 -0800 (PST)
From:	Hugh Dickins <hughd@...gle.com>
To:	"Borzenkov, Andrey" <andrey.borzenkov@...fujitsu.com>
cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: Transparent huge pages and shmem?

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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