From: Andrew Morton <akpm@digeo.com>
To: Akira Tsukamoto <at541@columbia.edu>
Cc: linux-kernel@vger.kernel.org, Hirokazu Takahashi <taka@valinux.co.jp>
Subject: Re: [PATCH] 2/2 2.5.45 cleanup & add original copy_ro/from_user
Date: Sat, 02 Nov 2002 10:13:46 -0800 [thread overview]
Message-ID: <3DC415DA.29D22E92@digeo.com> (raw)
In-Reply-To: 20021102060423.032A.AT541@columbia.edu
Akira Tsukamoto wrote:
>
> On Sat, 02 Nov 2002 02:32:32 -0800
> Andrew Morton <akpm@digeo.com> mentioned:
>
> > Akira Tsukamoto wrote:
> > >
> > But you've inlined them again. Your patches increase my kernel
> > size by 17 kbytes, which is larger than my entire Layer 1 instruction
> > cache!
>
> It is because I was working on this patch based on 2.5.44 :)
>
> As Andi mentioned, how about selecting if OCNFIG_SAMLL is defined?
Well you could make it dependent on CONFIG_SLOW_KERNEL ;)
It's an act of faith - we have no benchmarks on this. But it
goes like this:
- subroutine calls are fast
- cache misses are slow
- kernel has no right to be evicting user code from the CPU cache
- smaller is faster
- inlining to the point of increasing code size is probably wrong
next prev parent reply other threads:[~2002-11-02 18:07 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-11-02 8:06 [PATCH] 2/2 2.5.45 cleanup & add original copy_ro/from_user Akira Tsukamoto
2002-11-02 10:32 ` Andrew Morton
2002-11-02 11:07 ` Akira Tsukamoto
2002-11-02 18:13 ` Andrew Morton [this message]
2002-11-03 2:43 ` Akira Tsukamoto
2002-11-03 4:04 ` Andrew Morton
2002-11-03 2:43 ` Akira Tsukamoto
2002-11-03 2:57 ` Akira Tsukamoto
2002-11-03 21:24 ` Dave Jones
2002-11-03 22:22 ` Andries Brouwer
[not found] <20021102025838.220E.AT541@columbia.edu.suse.lists.linux.kernel>
[not found] ` <3DC3A9C0.7979C276@digeo.com.suse.lists.linux.kernel>
2002-11-02 10:58 ` Andi Kleen
2002-11-02 11:03 ` Andrew Morton
2002-11-02 16:55 ` Denis Vlasenko
2002-11-02 12:09 ` Andi Kleen
2002-11-02 17:08 ` Denis Vlasenko
2002-11-02 12:23 ` Andi Kleen
-- strict thread matches above, loose matches on Subject: below --
2002-11-04 3:36 Akira Tsukamoto
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