linux-kernel - Re: [PATCH] Physical Memory Management [0/1]

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Message-id: <op.utyxdu2j7p4s8u@amdc030>
Date:	Fri, 15 May 2009 13:11:44 +0200
From:	Michał Nazarewicz <m.nazarewicz@...sung.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, m.szyprowski@...sung.com,
	kyungmin.park@...sung.com, linux-mm@...ck.org
Subject: Re: [PATCH] Physical Memory Management [0/1]

> On Fri, 2009-05-15 at 12:47 +0200, Michał Nazarewicz wrote:
>> I cannot create a huge page SysV shared memory segment
>> with pages of specified size, can I?

On Fri, 15 May 2009 13:03:34 +0200, Peter Zijlstra wrote:
> Well, hugetlbfs is a fs, so you can simply create a file on there and
> map that shared -- much saner interface than sysvshm if you ask me.

It's not a question of being sane or not, it's a question of whether
X server supports it and it doesn't.  X can read data from Sys V shm
to avoid needles copying (or sending via unix socket or whatever)
pixmaps (or whatever) and so PMM lets it read from continuous blocks
without knowing or carying about it.

-- 
Best regards,                                            _     _
 .o. | Liege of Serenly Enlightened Majesty of         o' \,=./ `o
 ..o | Computer Science,  Michał "mina86" Nazarewicz      (o o)
 ooo +-<m.nazarewicz@...sung.com>-<mina86@...ber.org>-ooO--(_)--Ooo--

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