linux-kernel - Re: [00/41] Large Blocksize Support V7 (adds memmap support)

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Date:	Tue, 18 Sep 2007 21:18:53 +0200
From:	Andrea Arcangeli <andrea@...e.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Nick Piggin <nickpiggin@...oo.com.au>,
	Christoph Lameter <clameter@....com>,
	Mel Gorman <mel@...net.ie>, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
	William Lee Irwin III <wli@...omorphy.com>,
	David Chinner <dgc@....com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Fengguang Wu <fengguang.wu@...il.com>,
	swin wang <wangswin@...il.com>, totty.lu@...il.com,
	hugh@...itas.com, joern@...ybastard.org
Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support)

On Tue, Sep 18, 2007 at 11:30:17AM -0700, Linus Torvalds wrote:
> The fact is, *none* of those things are true. The VM doesn't guarantee 
> anything, and is already very much about statistics in many places. You 

Many? I can't recall anything besides PF_MEMALLOC and the decision
that the VM is oom. Those are the only two gray areas... the safety
margin is large enough that nobody notices the lack of black-and-white
solution.

So instead of working to provide guarantees for the above two gray
spots, we're making everything weaker, that's the wrong direction as
far as I can tell, especially if we're going to mess up big time the
commo code in a backwards way only for those few users of those few
I/O devices out there.

In general every time reliability has a low priority than performance
I've an hard time to enjoy it.
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