linux-kernel - Re: [PATCH 0/2] jump label: 2.6.38 updates

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Date:	Tue, 15 Feb 2011 14:04:08 +0000
From:	Will Newton <will.newton@...il.com>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Matt Fleming <matt@...sole-pimps.org>,
	David Miller <davem@...emloft.net>, rostedt@...dmis.org,
	peterz@...radead.org, jbaron@...hat.com,
	mathieu.desnoyers@...ymtl.ca, mingo@...e.hu, tglx@...utronix.de,
	andi@...stfloor.org, roland@...hat.com, rth@...hat.com,
	masami.hiramatsu.pt@...achi.com, fweisbec@...il.com,
	avi@...hat.com, sam@...nborg.org, ddaney@...iumnetworks.com,
	michael@...erman.id.au, linux-kernel@...r.kernel.org,
	vapier@...too.org, cmetcalf@...era.com, dhowells@...hat.com,
	schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
	benh@...nel.crashing.org
Subject: Re: [PATCH 0/2] jump label: 2.6.38 updates

On Tue, Feb 15, 2011 at 1:31 PM, H. Peter Anvin <hpa@...or.com> wrote:
> On 02/15/2011 03:01 AM, Will Newton wrote:
>>
>> The CPU in question has two sets of instructions:
>>
>>   load/store - these go via the cache (write through)
>>   ll/sc - these operate literally as if there is no cache (they do not
>> hit on read or write)
>>
>> This may or may not be a sensible way to architect a CPU, but I think
>> it is possible to make it work. Making it work efficiently is more of
>> a challenge.
>>
>
> a) What "CPU in question" is this?

http://imgtec.com/meta/meta-technology.asp

> b) Why should we let this particular insane CPU slow ALL OTHER CPUs down?

I didn't propose we do that. I brought it up just to make people aware
that there are these odd architectures out there, and indeed it turns
out Blackfin has some superficially similar issues.
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