linux-kernel - Re: kernel page table mapping for >1GB <3 GB for x86 arch without PAE

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Message-ID: <20090828231114.054596e7@lxorguk.ukuu.org.uk>
Date:	Fri, 28 Aug 2009 23:11:14 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	joe Shmoe <jsmoe3@...oo.com>
Cc:	Valdis.Kletnieks@...edu, linux-kernel@...r.kernel.org
Subject: Re: kernel page table mapping for >1GB <3 GB for x86 arch without
 PAE

On Fri, 28 Aug 2009 14:07:01 -0700 (PDT)
joe Shmoe <jsmoe3@...oo.com> wrote:

> doesn't CR3 gets reloaded for process switch? If so , how does it matter if you setup page table mapping for all the available RAM instead of limiting to just 1GB

Because

- You don't switch process every syscall
- You don't switch process every interrupt

The latter is the real killer.
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