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Date: Tue, 22 Oct 2002 09:14:41 -0700
From: "Martin J. Bligh" <mbligh@aracnet.com>
Reply-To: "Martin J. Bligh" <mbligh@aracnet.com>
To: Rik van Riel <riel@conectiva.com.br>
cc: "Eric W. Biederman" <ebiederm@xmission.com>,
       Bill Davidsen <davidsen@tmr.com>, Dave McCracken <dmccr@us.ibm.com>,
       Andrew Morton <akpm@digeo.com>,
       Linux Kernel <linux-kernel@vger.kernel.org>,
       Linux Memory Management <linux-mm@kvack.org>
Subject: Re: [PATCH 2.5.43-mm2] New shared page table patch
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> Actually, per-object reverse mappings are nowhere near as good
> a solution as shared page tables.  At least, not from the points
> of view of space consumption and the overhead of tearing down
> the mappings at pageout time.
> 
> Per-object reverse mappings are better for fork+exec+exit speed,
> though.
> 
> It's a tradeoff: do we care more for a linear speedup of fork(),
> exec() and exit() than we care about a possibly exponential
> slowdown of the pageout code ?

As long as the box doesn't fall flat on it's face in a jibbering
heap, that's the first order of priority ... ie I don't care much
for now ;-)

M.

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