* Transparent huge pages and shmem?
@ 2012-01-23 5:32 Borzenkov, Andrey
2012-01-23 19:38 ` Hugh Dickins
0 siblings, 1 reply; 2+ messages in thread
From: Borzenkov, Andrey @ 2012-01-23 5:32 UTC (permalink / raw)
To: linux-kernel
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.
Thank you!
---
With best regards
Andrey Borzenkov
Senior system engineer
Service operations
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Transparent huge pages and shmem?
2012-01-23 5:32 Transparent huge pages and shmem? Borzenkov, Andrey
@ 2012-01-23 19:38 ` Hugh Dickins
0 siblings, 0 replies; 2+ messages in thread
From: Hugh Dickins @ 2012-01-23 19:38 UTC (permalink / raw)
To: Borzenkov, Andrey; +Cc: linux-kernel, linux-mm
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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