From: Dan Malek <dan@netx4.com>
To: wung_y@263.net
Cc: linux-ppc <linuxppc-dev@lists.linuxppc.org>,
linuxppc embedded mail list
<linuxppc-embedded@lists.linuxppc.org>
Subject: Re: What's MMU context?
Date: Wed, 27 Oct 1999 11:55:33 -0400 [thread overview]
Message-ID: <38172075.EC2839C2@netx4.com> (raw)
In-Reply-To: 3816E6FD.481FA27D@263.net
Wang Yong wrote:
>
> as the source code of linuxPPC, there is a global variable named
> next_mmu_context which is increased by one at each time of create a new
> process. what does this mean and what is mmu context?
I intened to use it on the 8xx processors, as they have an address
space id that allows a TLB optimization so you don't have to
invalidate the entire TLB on context switches. I assume the
MIPS folks use it as well, since that is where I first used
such an optimization (in an OS other than Linux). Unfortunately,
the ratio of entries to ASIDs is wrong for my original MIPS-like
algorithm to work, and I never got around to writing something
new.
This was already part of the Linux/PPC port when I started the 8xx
work, and I don't know if other processors use it or if it was
just part of the generic port that was maintained.
-- Dan
** Sent via the linuxppc-dev mail list. See http://lists.linuxppc.org/
next prev parent reply other threads:[~1999-10-27 15:55 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-10-27 11:50 What's MMU context? Wang Yong
1999-10-27 15:55 ` Dan Malek [this message]
1999-12-07 2:58 ` Debugging with thread(s) Claude Robitaille
1999-12-07 13:14 ` Frank McPherson
1999-12-12 0:00 ` Thread and malloc Claude Robitaille
-- strict thread matches above, loose matches on Subject: below --
1999-10-28 4:42 What's MMU context? Wang Yong
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