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Date: Wed, 14 Feb 2001 08:50:35 +0900 (JST)
Message-Id: <200102132350.IAA07667@mule.m17n.org>
From: NIIBE Yutaka <gniibe@m17n.org>
To: Russell King <rmk@arm.linux.org.uk>
Cc: marcelo@conectiva.com.br (Marcelo Tosatti),
        torvalds@transmeta.com (Linus Torvalds),
        alan@lxorguk.ukuu.org.uk (Alan Cox),
        linux-kernel@vger.kernel.org (lkml)
Subject: Re: [PATCH] swapin flush cache bug
In-Reply-To: <200102131116.f1DBGFx02086@flint.arm.linux.org.uk>
In-Reply-To: <200102131053.TAA11808@mule.m17n.org>
	<200102131116.f1DBGFx02086@flint.arm.linux.org.uk>
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Russell King wrote:
 > Unless someone else (Rik/DaveM) says otherwise, it is my understanding
 > that any IO for page P will only ever be a write to disk.  Therefore,
 > when you get a copy of the page from the swap cache, the physical memory
 > for that page is the same as it was when the process was using it last.
[...]
 > The data from memory will still be up to date though.  However, I agree
 > that you will end up with cache aliases.  I will also end up with cache
 > aliases.  The question now is, do these aliases really matter?
 > 
 > On my caches, the answer is no because they're not marked dirty, and
 > therefore will get dropped from the cache without writeback to memory.
 > 
 > If your cache doesn't write back clean cache data to memory, then you
 > should also behave well.

Yes, that's the difference.  It's write back cache, in my case.
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