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From: Paul Mundt <lethal@linux-sh.org>
To: Bernd Schmidt <bernds_cb1@t-online.de>
Cc: "Wu, Bryan" <bryan.wu@analog.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	linux-kernel@vger.kernel.org
Subject: Re: [PATCH -mm 1/5] Blackfin: blackfin architecture patch update
Date: Mon, 5 Mar 2007 21:39:10 +0900	[thread overview]
Message-ID: <20070305123910.GA13684@linux-sh.org> (raw)
In-Reply-To: <45EC0DC7.8080504@t-online.de>

On Mon, Mar 05, 2007 at 01:32:07PM +0100, Bernd Schmidt wrote:
> Paul Mundt wrote:
> >>+comment "Memory Optimizations"
> >>+
> >>+config I_ENTRY_L1
> >>+	bool "Locate interrupt entry code in L1 Memory"
> >>+	default y
> >>+	help
> >>+	  If enabled interrupt entry code (STORE/RESTORE CONTEXT) is linked
> >>+	  into L1 instruction memory.(less latency)
> >>+
> >Wow, this is really crying out for a special linker section with slightly
> >more intelligent relocation logic. You should flag the performance
> >critical parts to be located in L1 memory directly with a section
> >attribute, rather than making everything selectable. If you overflow you
> >can simply spill in to main memory.
> 
> This is done intentionally, because it's also possible for user code to 
> be loaded into L1 memory.  We want to give users the option to avoid 
> filling it all up with kernel code.
> 
So then why not make the userspace component of it optional and allow a size
cap for kernel usage that's configurable if it's enabled? This degree of
abstraction is almost worse than no abstraction.

  reply	other threads:[~2007-03-05 12:41 UTC|newest]

Thread overview: 24+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-03-01  4:14 Wu, Bryan
2007-03-03 20:38 ` Arnd Bergmann
2007-03-05  7:13   ` Wu, Bryan
2007-03-03 22:30 ` Arnd Bergmann
2007-03-03 22:50   ` bert hubert
2007-03-03 23:05     ` Arnd Bergmann
2007-03-05  6:54   ` Aubrey Li
2007-03-05  8:47     ` Arnd Bergmann
2007-03-05  9:19       ` Wu, Bryan
2007-03-05 16:43         ` Arnd Bergmann
2007-03-05  7:34   ` Wu, Bryan
2007-03-05  8:10     ` Arnd Bergmann
2007-03-06  2:09   ` Mike Frysinger
2007-03-05  9:23 ` Paul Mundt
2007-03-05 12:32   ` Bernd Schmidt
2007-03-05 12:39     ` Paul Mundt [this message]
2007-03-05 13:26       ` Robin Getz
2007-03-05 14:00         ` Paul Mundt
2007-03-05 16:29           ` Robin Getz
2007-03-05 17:32             ` Paul Mundt
2007-03-05 22:06               ` Robin Getz
2007-03-06  2:04   ` Mike Frysinger
2007-03-21 15:44   ` Mike Frysinger
2007-03-21 23:42     ` Paul Mundt

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