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Date: Thu, 15 Aug 2002 22:16:47 -0400
From: Benjamin LaHaise <bcrl@redhat.com>
To: Linus Torvalds <torvalds@transmeta.com>
Cc: Andrea Arcangeli <andrea@suse.de>, Alan Cox <alan@lxorguk.ukuu.org.uk>,
       Chris Friesen <cfriesen@nortelnetworks.com>,
       Pavel Machek <pavel@elf.ucw.cz>, linux-kernel@vger.kernel.org,
       linux-aio@kvack.org
Subject: Re: aio-core why not using SuS? [Re: [rfc] aio-core for 2.5.29 (Re: async-io API registration for 2.5.29)]
Message-ID: <20020815221647.M29874@redhat.com>
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In-Reply-To: <Pine.LNX.4.44.0208151905500.1271-100000@home.transmeta.com>; from torvalds@transmeta.com on Thu, Aug 15, 2002 at 07:08:30PM -0700
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On Thu, Aug 15, 2002 at 07:08:30PM -0700, Linus Torvalds wrote:
> 
> On Thu, 15 Aug 2002, Benjamin LaHaise wrote:
> > 
> > A 4G/4G split flushes the TLB on every syscall.
> 
> This is just not going to happen. It will have to continue being a 3/1G 
> split, and we'll just either find a way to move stuff to highmem and 
> shrink the "struct page", or we'll just say "screw those 16GB+ machines on 
> x86". 

I wish life were that simple.  Unfortunately, struct page isn't the only 
problem with these abominations: the system can run out of kvm for 
vm_area_struct, task_struct, files...  Personally, I *never* want to see 
those data structures being kmap()'d as it would hurt kernel code quality 
whereas a 4G/4G split is well confined, albeit sickening.

		-ben
-- 
"You will be reincarnated as a toad; and you will be much happier."
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