linux-kernel - Re: O_DIRECT question

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Date:	Thu, 11 Jan 2007 16:49:59 +0800
From:	"Roy Huang" <royhuang9@...il.com>
To:	"Nick Piggin" <nickpiggin@...oo.com.au>
Cc:	Aubrey <aubreylee@...il.com>, "Andrew Morton" <akpm@...l.org>,
	"Linus Torvalds" <torvalds@...l.org>,
	"Hua Zhong" <hzhong@...il.com>, "Hugh Dickins" <hugh@...itas.com>,
	linux-kernel@...r.kernel.org, hch@...radead.org,
	kenneth.w.chen@...el.com, mjt@....msk.ru
Subject: Re: O_DIRECT question

There is already an EMBEDDED option in config, so I think linux is
also supporting embedded system. There are many developers working on
embedded system runing linux. They also hope to contribute to linux,
then other embeded developers can share it.

On 1/11/07, Nick Piggin <nickpiggin@...oo.com.au> wrote:
> Aubrey wrote:
> > On 1/11/07, Nick Piggin <nickpiggin@...oo.com.au> wrote:
>
> >> What you _really_ want to do is avoid large mallocs after boot, or use
> >> a CPU with an mmu. I don't think nommu linux was ever intended to be a
> >> simple drop in replacement for a normal unix kernel.
> >
> >
> > Is there a position available working on mmu CPU? Joking, :)
> > Yes, some problems are serious on nommu linux. But I think we should
> > try to fix them not avoid them.
>
> Exactly, and the *real* fix is to modify userspace not to make > PAGE_SIZE
> mallocs[*] if it is to be nommu friendly. It is the kernel hacks to do things
> like limit cache size that are the bandaids.
>
> Of course, being an embedded system, if they work for you then that's
> really fine and you can obviously ship with them. But they don't need to
> go upstream.
>
> --
> SUSE Labs, Novell Inc.
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