linux-kernel - Re: [PATCH -mm 1/5] Blackfin: blackfin architecture patch update

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Message-ID: <20070305123910.GA13684@linux-sh.org>
Date:	Mon, 5 Mar 2007 21:39:10 +0900
From:	Paul Mundt <lethal@...ux-sh.org>
To:	Bernd Schmidt <bernds_cb1@...nline.de>
Cc:	"Wu, Bryan" <bryan.wu@...log.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH -mm 1/5] Blackfin: blackfin architecture patch update

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.
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