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
Date: Wed, 14 Feb 2001 08:50:35 +0900 (JST) [thread overview]
Message-ID: <200102132350.IAA07667@mule.m17n.org> (raw)
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>
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.
--
next prev parent reply other threads:[~2001-02-13 23:51 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2001-02-12 23:21 Marcelo Tosatti
2001-02-13 9:50 ` Russell King
2001-02-13 10:53 ` NIIBE Yutaka
2001-02-13 11:16 ` Russell King
2001-02-13 11:26 ` Alan Cox
2001-02-13 23:50 ` NIIBE Yutaka [this message]
2001-02-14 2:08 ` NIIBE Yutaka
2001-02-14 10:12 ` Marcelo Tosatti
2001-06-27 0:51 ` NIIBE Yutaka
2001-06-27 10:11 ` Marcelo Tosatti
2001-06-28 0:42 ` David S. Miller
2001-06-28 0:07 ` NIIBE Yutaka
2001-06-27 22:41 ` Marcelo Tosatti
2001-06-28 0:23 ` Stephen C. Tweedie
2001-06-28 0:47 ` David S. Miller
2001-06-28 1:10 ` David S. Miller
2001-06-29 14:18 ` NIIBE Yutaka
2001-07-02 22:47 ` Cache issues David S. Miller
2001-06-28 0:41 ` [PATCH] swapin flush cache bug NIIBE Yutaka
2001-06-28 1:04 ` NIIBE Yutaka
2001-07-02 11:23 ` Cache issues NIIBE Yutaka
2001-07-03 0:04 ` NIIBE Yutaka
2001-06-28 0:46 ` [PATCH] swapin flush cache bug David S. Miller
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