linux-kernel - Re: [PATCH, v3] shmat: introduce flag SHM_MAP_NOT

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Message-ID: <20081008000518.13f48462@lxorguk.ukuu.org.uk>
Date:	Wed, 8 Oct 2008 00:05:18 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andi Kleen <andi@...stfloor.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Hugh Dickins <hugh@...itas.com>,
	Ulrich Drepper <drepper@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH, v3] shmat: introduce flag SHM_MAP_NOT_FIXED

On Tue, 7 Oct 2008 23:10:38 +0200
Andi Kleen <andi@...stfloor.org> wrote:

> > Sorry, no.
> > This description still doesn't explain why this interface is needed.
> > 
> > The one of the points is this interface is used by another person or not.
> > You should explain how large this interface benefit has.
> > 
> > Andi kleen explained this interface _can_  be used another one.
> > but nobody explain who use it actually.
> 
> Anyone who doesn't want to use fixed addresses. 

Can use shm_open and mmap to get POSIX standard shm behaviour via a sane
interface without adding more crap to the sys3 shm madness. 

Sorry this patch is completely bogus - introduce the user programs
involved to 1990s technology. They have to be updated to use such a
change as is proposed anyway so they might as well use shm_open/mmap at
which point no kernel changes are needed.

Alan
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