Wolfgang Denk writes:
> This probably depends a bit on the performance of the system in
> question. Did you measure it - for example - on a 50 MHz MPC850 ?
The patch only affects arch/powerpc/kernel/entry_64.S. So no, I
didn't measure it on a 50MHz MPC850, or indeed any 32-bit system. :)
On Tue, Apr 29, 2008 at 08:40:47PM +0200, Wolfgang Denk wrote:
> This probably depends a bit on the performance of the system in
> question. Did you measure it - for example - on a 50 MHz MPC850 ?
You got a 64bit kernel to run on a MPC850? wow :)
Not sure what the slowest supported 64bit cp
In message <[EMAIL PROTECTED]> you wrote:
>
> > Am I missing something here or does this add a branch for every normal
> > syscall?
>
> It does, but the impact is so small as to be unmeasurable with
> lmbench, even on the null syscall measurement. The overhead of the
> easily-predicted not-taken
Christoph Hellwig writes:
> Am I missing something here or does this add a branch for every normal
> syscall?
It does, but the impact is so small as to be unmeasurable with
lmbench, even on the null syscall measurement. The overhead of the
easily-predicted not-taken branch is completely swamped
On Mon, Apr 28, 2008 at 4:43 PM, Christoph Hellwig <[EMAIL PROTECTED]> wrote:
> Please see Michael Kerrisk on userspace ABI updates. A nice little
> manpage for this gimmick would be helpful, and maybe help other
> platforms that want one aswell to implement the same API.
Thanks Chrsitoph. I'm n
Please see Michael Kerrisk on userspace ABI updates. A nice little
manpage for this gimmick would be helpful, and maybe help other
platforms that want one aswell to implement the same API.
On Mon, Apr 28, 2008 at 01:52:31PM +1000, Paul Mackerras wrote:
> This adds a system call on 64-bit platform
This adds a system call on 64-bit platforms for switching between
little-endian and big-endian modes that is much faster than doing a
prctl call. This system call is handled as a special case right at
the start of the system call entry code, and because it is a special
case, it uses a system call
