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List:       linuxsh-dev
Subject:    Re: [PATCH] kmap: SH-4 user page copy/clear overhaul
From:       Paul Mundt <lethal () linux-sh ! org>
Date:       2007-02-17 19:07:16
Message-ID: 20070217190716.GA8432 () linux-sh ! org
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Iwamatsu-san,

On Sat, Feb 17, 2007 at 02:50:16PM +0900, Nobuhiro Iwamatsu wrote:
> On Wed, 7 Feb 2007 21:23:06 +0900
> Paul Mundt <paul.mundt@renesas.com> wrote:
> > This introduces the first attempt at overhauling the user page copy/clear
> > interface for the aliasing VIPT cases (only SH-4 and SH-4A right now,
> > SH7705 should be able to use it directly, though, when in 32k cache mode).
> > 
> I m checking this patch on Solution Engine 7750 and LANTANK( 7751R ) and sh-min( 7706 ).
> I confirmed the kernel and the user land worked on Solution Engine 7750. 
> And I m testing in the environment of 7751R now. 
> 
It's not likely to have any effect on shmin given that it's SH-4
specific. I don't recall offhand if SH7706 includes extended aliasing
caches like SH7705 or not, but these patches can easily be extended as a
more generic solution to handle those cases too.

> BTW , I want to be doing this test adequately. Is there something a good idea?
> I checked start of the kernel and LTP on the user land where busybox was used , now .
> 
I'd be interested in various workloads, anything that stresses these
particular routines is of course of the most interest (you can use basic
profiling with readprofile to see which workloads end up being heavier in
this area than others).

Jamie suggested offlist that the busybox syslogd in IPC buffer mode is
something that accomplishes this, but I've not been able to reproduce his
problems yet on any of my boards.

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