Re: [patch] context-switching overhead in X, ioport(), 2.6.8.1

[Ryan Cumming]

On Saturday 21 August 2004 23:00, Lee Revell wrote:
> On Sun, 2004-08-22 at 01:42, Ryan Cumming wrote:
> > On Saturday 21 August 2004 21:46, David S. Miller wrote:
> > > FWIW, I would recommend a sparse bitmap implementation for the
> > > ioport stuff.
> >
> > The problem is that the sparse bitmap would have to be unpacked to the
> > "dense" bitmap that lives in the TSS on context switch.
>
> Can someone supply a link to the original LKML post with the ioport
> change?  I was not able to find it in my mailbox nor in the archives.

Here's what I could dig up:

ftp://ftp.kernel.org/pub/linux/kernel/people/akpm/patches/2.6/2.6.7/2.6.7-mm2/broken-out/larger-io-bitmap.patch
http://www.uwsg.iu.edu/hypermail/linux/kernel/0211.0/0477.html
http://www.uwsg.iu.edu/hypermail/linux/kernel/9807.1/1079.html

Looks like x86-64 does in fact need a similar change to the x86 one. It's late 
here, but it should be pretty trivial to port over.

-Ryan

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