From: "Gleb O. Raiko" <raiko@niisi.msk.ru>
To: Ralf Baechle <ralf@linux-mips.org>
Cc: "Maciej W. Rozycki" <macro@linux-mips.org>,
Kevin Cernekee <cernekee@gmail.com>,
"wilbur.chan" <wilbur512@gmail.com>,
Linux MIPS Mailing List <linux-mips@linux-mips.org>
Subject: Re: Question about Context register in TLB refilling
Date: Mon, 18 Oct 2010 14:46:02 +0400 [thread overview]
Message-ID: <4CBC256A.7020808@niisi.msk.ru> (raw)
In-Reply-To: <20101018000030.GB31080@linux-mips.org>
On 18.10.2010 4:00, Ralf Baechle wrote:
> The aliasing problem is solvable and it may be worth to revisit that old
> piece of code again now 15 years later.
Before anybody will start to prepare patches, I'd like to note using
c0_context allows less than 128 processes (their mm contexts in fact but
who cares) to be directly mapped on 32-bit cpus. So, some kind of
caching needs to be implemented and it will add overhead on every mm
switch. Sure, this overhead might be bounded for a real case where there
is a small number of processes, so they all fit in the cache.
--- Beware, wild assumptions here ---
I'm afraid the cost of such caching still will be higher than loading
pgd_current even from main memory on tlb refill.
--- End of wild assumptions ---
Gleb.
next prev parent reply other threads:[~2010-10-18 10:30 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-10-17 15:51 Question about Context register in TLB refilling wilbur.chan
2010-10-17 17:50 ` Kevin Cernekee
2010-10-17 19:33 ` Maciej W. Rozycki
2010-10-17 20:52 ` Kevin Cernekee
2010-10-17 21:56 ` Maciej W. Rozycki
2010-10-18 0:00 ` Ralf Baechle
2010-10-18 10:46 ` Gleb O. Raiko [this message]
2010-10-18 12:48 ` Ralf Baechle
2010-10-18 14:03 ` Gleb O. Raiko
2010-10-24 5:26 ` Maciej W. Rozycki
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