From: Jeff Dike <jdike@addtoit.com>
To: Blaisorblade <blaisorblade@yahoo.it>
Cc: user-mode-linux-devel@lists.sourceforge.net,
Young Koh <young.koh@gmail.com>
Subject: Re: [uml-devel] a question about sigsetjmp() in copy_from/to_user()
Date: Sun, 2 Oct 2005 14:31:23 -0400 [thread overview]
Message-ID: <20051002183123.GC26063@ccure.user-mode-linux.org> (raw)
In-Reply-To: <200510021223.15115.blaisorblade@yahoo.it>
On Sun, Oct 02, 2005 at 12:23:14PM +0200, Blaisorblade wrote:
> Sorry, any reference will fault, unless it is done on a allocated present
> page, which the UML kernel freed but the host didn't. And remember, btw,
> you've planned to make this impossible...
You are not making any sense t me here.
> Sorry, Jeff, which page are you going to evict? It can be a dirty page. Unless
> you mean that since that page is still accounted in the FS, Linux will leave
> a RAM page free to allow it to be re-read, while still swapping the page.
Swapped pages are accounted in the FS all the time and there's obviously
no dedicated page left free for them when they are next pulled in. All
disk-based filesystems account pages that are on disk and not in memory.
tmpfs is no different, except that its disk is the swap partition.
Jeff
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next prev parent reply other threads:[~2005-10-02 18:54 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-09-27 14:06 [uml-devel] a question about sigsetjmp() in copy_from/to_user() Young Koh
2005-09-27 17:28 ` Jeff Dike
2005-09-28 11:59 ` Blaisorblade
2005-09-28 13:47 ` Young Koh
2005-09-28 14:50 ` Jeff Dike
2005-09-28 19:25 ` Young Koh
2005-09-29 12:09 ` Blaisorblade
2005-09-30 15:08 ` Young Koh
2005-09-30 15:44 ` Geert Uytterhoeven
2005-10-02 1:03 ` Jeff Dike
2005-10-02 10:23 ` Blaisorblade
2005-10-02 18:31 ` Jeff Dike [this message]
2005-10-03 18:35 ` Blaisorblade
2005-10-03 20:38 ` Jeff Dike
2005-09-28 16:09 ` Jeff Dike
2005-09-28 17:26 ` Blaisorblade
2005-09-28 18:43 ` Jeff Dike
2005-09-28 8:41 ` Blaisorblade
2005-09-28 14:22 ` Young Koh
2005-09-28 16:43 ` Blaisorblade
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