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

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Message-ID: <20081008134604.27d3eb7a@lxorguk.ukuu.org.uk>
Date:	Wed, 8 Oct 2008 13:46:04 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Andi Kleen <andi@...stfloor.org>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"Kirill A. Shutemov" <kirill@...temov.name>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.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

> > kernel is not to provide nappies for people who think programming is too
> > hard but to provide services that can be used to build applications.
> 
> Outsourcing kernel locking to user space is not the way to go.

You mean like say flock, O_APPEND  ...

Putting stuff in user space is good, it means we don't carry tons of
never used app specific crap in the kernel, in every users kernel,
unpageable and basically unused.

Alan
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