From: Benjamin Herrenschmidt <benh@kernel.crashing.org>
To: Mel Gorman <MELGOR@ie.ibm.com>
Cc: linuxppc-dev@lists.ozlabs.org, Anton Blanchard <anton@samba.org>
Subject: Re: powerpc: Move 64bit heap above 1TB on machines with 1TB segments
Date: Wed, 23 Sep 2009 07:08:22 +1000 [thread overview]
Message-ID: <1253653702.7103.244.camel@pasglop> (raw)
In-Reply-To: <OFE590BAE9.6FD7FAB3-ON80257639.0050F8A6-80257639.00514A5E@ie.ibm.com>
> Unfortunately, I am not sensitive to issues surrounding 1TB segments or how
> they are currently being used. However, as this clearly helps performance
> for large amounts of memory, is it worth providing an option to
> libhugetlbfs to locate 16MB pages above 1TB when they are otherwise being
> unused?
AFAIK, that is already the case, at least the kernel will hand out pages
above 1T preferentially iirc.
There were talks about making huge pages below 1T not even come up
untily you ask for them with MAP_FIXED, dunno where that went.
Cheers,
Ben.
next prev parent reply other threads:[~2009-09-22 21:08 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2009-09-22 2:52 powerpc: Move 64bit heap above 1TB on machines with 1TB segments Anton Blanchard
2009-09-22 14:47 ` Mel Gorman
2009-09-22 21:08 ` Benjamin Herrenschmidt [this message]
2009-09-23 0:03 ` David Gibson
2009-09-23 12:50 ` Mel Gorman
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